Re: 05 Elantra GLS 5-Door, Rear brake pads wore out at 14K miles
 

On 23 May 2006 07:52:04 -0700, "05and06elantra" <gnaledge@gmail.com> wrote:


>Looking for any info I can relay to the dealer to tell them to look for
>if anyone has come across this problem. Any help would be appreciated.

Check the proportioning valve. (I assume it has one!). The function of this
valve is to reduce braking pressure on the rear brakes. That's because the
rear wheels are much easier to lock under hard braking than the front
brakes. It's possible that computer control/ABS have supplanted the
proportioning valve. I haven't been under a new car to check, thank
goodness. :)

Meanwhile, you can jack up each rear wheel and give it a spin. They should
spin freely, or perhaps with a slight intermittent light rub. (Even
near-perfect rotors usually have .0005-.001 runout, and can rub a little bit
in spots.) If the pads rub hard enough to prevent a full spin or 2, you
have a problem.
--
Bob

Re: 05 Elantra GLS 5-Door, Rear brake pads wore out at 14K miles
 

Brian Nystrom wrote:
> 05and06elantra wrote:
>
>> Well, that's not the case in this situation. And it's my understanding
>> (though I may be wrong) that the parking brake only enages the rear
>> driver's side brake. Therefore, this would not explain the same wear
>> on the passenger's side. My intial thought was that maybe the parking
>> brake wasn't releasing completely, but if my assumption is correct
>> about the parking brake only engaging one set of brakes, that
>> eliminates that as a possiblity as well.
>>
> Don't be so sure. I just checked the online service manual on Hyundai
> Webtech and the parking brake definitely works on BOTH rear wheels. For
> that matter, I've never heard of a car that only used one wheel.
> Remember, in addition to it's parking duties, this is the emergency
> brake that you're supposed to use in case of a hydraulic failure in the
> main brake system.

I'm not familiar with the Elantra, but does it actuate the normal
service brakes for the parking brake function? I'm pretty sure the new
Sonata has separate drum brakes for the parking brake separate from the
disc service brakes.

Matt

Re: 05 Elantra GLS 5-Door, Rear brake pads wore out at 14K miles
 

Brian Nystrom wrote:
> 05and06elantra wrote:
>
>> Well, that's not the case in this situation. And it's my understanding
>> (though I may be wrong) that the parking brake only enages the rear
>> driver's side brake. Therefore, this would not explain the same wear
>> on the passenger's side. My intial thought was that maybe the parking
>> brake wasn't releasing completely, but if my assumption is correct
>> about the parking brake only engaging one set of brakes, that
>> eliminates that as a possiblity as well.
>>
> Don't be so sure. I just checked the online service manual on Hyundai
> Webtech and the parking brake definitely works on BOTH rear wheels. For
> that matter, I've never heard of a car that only used one wheel.
> Remember, in addition to it's parking duties, this is the emergency
> brake that you're supposed to use in case of a hydraulic failure in the
> main brake system.

I'm not familiar with the Elantra, but does it actuate the normal
service brakes for the parking brake function? I'm pretty sure the new
Sonata has separate drum brakes for the parking brake separate from the
disc service brakes.

Matt

Re: 05 Elantra GLS 5-Door, Rear brake pads wore out at 14K miles
 

Brian Nystrom wrote:
> 05and06elantra wrote:
>
>> Well, that's not the case in this situation. And it's my understanding
>> (though I may be wrong) that the parking brake only enages the rear
>> driver's side brake. Therefore, this would not explain the same wear
>> on the passenger's side. My intial thought was that maybe the parking
>> brake wasn't releasing completely, but if my assumption is correct
>> about the parking brake only engaging one set of brakes, that
>> eliminates that as a possiblity as well.
>>
> Don't be so sure. I just checked the online service manual on Hyundai
> Webtech and the parking brake definitely works on BOTH rear wheels. For
> that matter, I've never heard of a car that only used one wheel.
> Remember, in addition to it's parking duties, this is the emergency
> brake that you're supposed to use in case of a hydraulic failure in the
> main brake system.

I'm not familiar with the Elantra, but does it actuate the normal
service brakes for the parking brake function? I'm pretty sure the new
Sonata has separate drum brakes for the parking brake separate from the
disc service brakes.

Matt

Re: 05 Elantra GLS 5-Door, Rear brake pads wore out at 14K miles
 

Matt Whiting wrote:
> Brian Nystrom wrote:
>
>> 05and06elantra wrote:
>>
>>> Well, that's not the case in this situation. And it's my understanding
>>> (though I may be wrong) that the parking brake only enages the rear
>>> driver's side brake. Therefore, this would not explain the same wear
>>> on the passenger's side. My intial thought was that maybe the parking
>>> brake wasn't releasing completely, but if my assumption is correct
>>> about the parking brake only engaging one set of brakes, that
>>> eliminates that as a possiblity as well.
>>>
>> Don't be so sure. I just checked the online service manual on Hyundai
>> Webtech and the parking brake definitely works on BOTH rear wheels.
>> For that matter, I've never heard of a car that only used one wheel.
>> Remember, in addition to it's parking duties, this is the emergency
>> brake that you're supposed to use in case of a hydraulic failure in
>> the main brake system.
>
>
> I'm not familiar with the Elantra, but does it actuate the normal
> service brakes for the parking brake function?

Yes, it does.

> I'm pretty sure the new
> Sonata has separate drum brakes for the parking brake separate from the
> disc service brakes.

That appears to be the case. The diagram isn't as clear as I'd like, but
it looks like it actuates pads that run inside the periphery of the
cylindrical part of the brake disk. If that's actually the case, it may
be fine for parking, I can't see it being of much use as an emergency brake.

Smart companies like Saab use the front brakes as parking/emergency
brakes so that you still have ~70% braking capacity in the case of a
complete hydraulic failure. They also use dual diagonal braking circuits
instead of front and rear circuits, so you don't lose more than 50%
braking capacity if one circuit fails.

Re: 05 Elantra GLS 5-Door, Rear brake pads wore out at 14K miles
 

Matt Whiting wrote:
> Brian Nystrom wrote:
>
>> 05and06elantra wrote:
>>
>>> Well, that's not the case in this situation. And it's my understanding
>>> (though I may be wrong) that the parking brake only enages the rear
>>> driver's side brake. Therefore, this would not explain the same wear
>>> on the passenger's side. My intial thought was that maybe the parking
>>> brake wasn't releasing completely, but if my assumption is correct
>>> about the parking brake only engaging one set of brakes, that
>>> eliminates that as a possiblity as well.
>>>
>> Don't be so sure. I just checked the online service manual on Hyundai
>> Webtech and the parking brake definitely works on BOTH rear wheels.
>> For that matter, I've never heard of a car that only used one wheel.
>> Remember, in addition to it's parking duties, this is the emergency
>> brake that you're supposed to use in case of a hydraulic failure in
>> the main brake system.
>
>
> I'm not familiar with the Elantra, but does it actuate the normal
> service brakes for the parking brake function?

Yes, it does.

> I'm pretty sure the new
> Sonata has separate drum brakes for the parking brake separate from the
> disc service brakes.

That appears to be the case. The diagram isn't as clear as I'd like, but
it looks like it actuates pads that run inside the periphery of the
cylindrical part of the brake disk. If that's actually the case, it may
be fine for parking, I can't see it being of much use as an emergency brake.

Smart companies like Saab use the front brakes as parking/emergency
brakes so that you still have ~70% braking capacity in the case of a
complete hydraulic failure. They also use dual diagonal braking circuits
instead of front and rear circuits, so you don't lose more than 50%
braking capacity if one circuit fails.

Re: 05 Elantra GLS 5-Door, Rear brake pads wore out at 14K miles
 

Matt Whiting wrote:
> Brian Nystrom wrote:
>
>> 05and06elantra wrote:
>>
>>> Well, that's not the case in this situation. And it's my understanding
>>> (though I may be wrong) that the parking brake only enages the rear
>>> driver's side brake. Therefore, this would not explain the same wear
>>> on the passenger's side. My intial thought was that maybe the parking
>>> brake wasn't releasing completely, but if my assumption is correct
>>> about the parking brake only engaging one set of brakes, that
>>> eliminates that as a possiblity as well.
>>>
>> Don't be so sure. I just checked the online service manual on Hyundai
>> Webtech and the parking brake definitely works on BOTH rear wheels.
>> For that matter, I've never heard of a car that only used one wheel.
>> Remember, in addition to it's parking duties, this is the emergency
>> brake that you're supposed to use in case of a hydraulic failure in
>> the main brake system.
>
>
> I'm not familiar with the Elantra, but does it actuate the normal
> service brakes for the parking brake function?

Yes, it does.

> I'm pretty sure the new
> Sonata has separate drum brakes for the parking brake separate from the
> disc service brakes.

That appears to be the case. The diagram isn't as clear as I'd like, but
it looks like it actuates pads that run inside the periphery of the
cylindrical part of the brake disk. If that's actually the case, it may
be fine for parking, I can't see it being of much use as an emergency brake.

Smart companies like Saab use the front brakes as parking/emergency
brakes so that you still have ~70% braking capacity in the case of a
complete hydraulic failure. They also use dual diagonal braking circuits
instead of front and rear circuits, so you don't lose more than 50%
braking capacity if one circuit fails.

Re: 05 Elantra GLS 5-Door, Rear brake pads wore out at 14K miles
 

Brian Nystrom wrote:
> Matt Whiting wrote:
>
>> Brian Nystrom wrote:
>>
>>> 05and06elantra wrote:
>>>
>>>> Well, that's not the case in this situation. And it's my understanding
>>>> (though I may be wrong) that the parking brake only enages the rear
>>>> driver's side brake. Therefore, this would not explain the same wear
>>>> on the passenger's side. My intial thought was that maybe the parking
>>>> brake wasn't releasing completely, but if my assumption is correct
>>>> about the parking brake only engaging one set of brakes, that
>>>> eliminates that as a possiblity as well.
>>>>
>>> Don't be so sure. I just checked the online service manual on Hyundai
>>> Webtech and the parking brake definitely works on BOTH rear wheels.
>>> For that matter, I've never heard of a car that only used one wheel.
>>> Remember, in addition to it's parking duties, this is the emergency
>>> brake that you're supposed to use in case of a hydraulic failure in
>>> the main brake system.
>>
>>
>>
>> I'm not familiar with the Elantra, but does it actuate the normal
>> service brakes for the parking brake function?
>
>
> Yes, it does.
>
>> I'm pretty sure the new Sonata has separate drum brakes for the
>> parking brake separate from the disc service brakes.
>
>
> That appears to be the case. The diagram isn't as clear as I'd like, but
> it looks like it actuates pads that run inside the periphery of the
> cylindrical part of the brake disk. If that's actually the case, it may
> be fine for parking, I can't see it being of much use as an emergency
> brake.
>
> Smart companies like Saab use the front brakes as parking/emergency
> brakes so that you still have ~70% braking capacity in the case of a
> complete hydraulic failure. They also use dual diagonal braking circuits
> instead of front and rear circuits, so you don't lose more than 50%
> braking capacity if one circuit fails.
>

This being the case, it sure sounds like the person had run the car for
a long distance with the parking brake on to wear our the rear pads well
before the fronts.

Does the Elantra and the Saab actuate the service brakes as parking
brakes using the main hydraulic system or do they use a mechanical
system that somehow actuates the main brakes?

Matt

Re: 05 Elantra GLS 5-Door, Rear brake pads wore out at 14K miles
 

Brian Nystrom wrote:
> Matt Whiting wrote:
>
>> Brian Nystrom wrote:
>>
>>> 05and06elantra wrote:
>>>
>>>> Well, that's not the case in this situation. And it's my understanding
>>>> (though I may be wrong) that the parking brake only enages the rear
>>>> driver's side brake. Therefore, this would not explain the same wear
>>>> on the passenger's side. My intial thought was that maybe the parking
>>>> brake wasn't releasing completely, but if my assumption is correct
>>>> about the parking brake only engaging one set of brakes, that
>>>> eliminates that as a possiblity as well.
>>>>
>>> Don't be so sure. I just checked the online service manual on Hyundai
>>> Webtech and the parking brake definitely works on BOTH rear wheels.
>>> For that matter, I've never heard of a car that only used one wheel.
>>> Remember, in addition to it's parking duties, this is the emergency
>>> brake that you're supposed to use in case of a hydraulic failure in
>>> the main brake system.
>>
>>
>>
>> I'm not familiar with the Elantra, but does it actuate the normal
>> service brakes for the parking brake function?
>
>
> Yes, it does.
>
>> I'm pretty sure the new Sonata has separate drum brakes for the
>> parking brake separate from the disc service brakes.
>
>
> That appears to be the case. The diagram isn't as clear as I'd like, but
> it looks like it actuates pads that run inside the periphery of the
> cylindrical part of the brake disk. If that's actually the case, it may
> be fine for parking, I can't see it being of much use as an emergency
> brake.
>
> Smart companies like Saab use the front brakes as parking/emergency
> brakes so that you still have ~70% braking capacity in the case of a
> complete hydraulic failure. They also use dual diagonal braking circuits
> instead of front and rear circuits, so you don't lose more than 50%
> braking capacity if one circuit fails.
>

This being the case, it sure sounds like the person had run the car for
a long distance with the parking brake on to wear our the rear pads well
before the fronts.

Does the Elantra and the Saab actuate the service brakes as parking
brakes using the main hydraulic system or do they use a mechanical
system that somehow actuates the main brakes?

Matt

Re: 05 Elantra GLS 5-Door, Rear brake pads wore out at 14K miles
 

Brian Nystrom wrote:
> Matt Whiting wrote:
>
>> Brian Nystrom wrote:
>>
>>> 05and06elantra wrote:
>>>
>>>> Well, that's not the case in this situation. And it's my understanding
>>>> (though I may be wrong) that the parking brake only enages the rear
>>>> driver's side brake. Therefore, this would not explain the same wear
>>>> on the passenger's side. My intial thought was that maybe the parking
>>>> brake wasn't releasing completely, but if my assumption is correct
>>>> about the parking brake only engaging one set of brakes, that
>>>> eliminates that as a possiblity as well.
>>>>
>>> Don't be so sure. I just checked the online service manual on Hyundai
>>> Webtech and the parking brake definitely works on BOTH rear wheels.
>>> For that matter, I've never heard of a car that only used one wheel.
>>> Remember, in addition to it's parking duties, this is the emergency
>>> brake that you're supposed to use in case of a hydraulic failure in
>>> the main brake system.
>>
>>
>>
>> I'm not familiar with the Elantra, but does it actuate the normal
>> service brakes for the parking brake function?
>
>
> Yes, it does.
>
>> I'm pretty sure the new Sonata has separate drum brakes for the
>> parking brake separate from the disc service brakes.
>
>
> That appears to be the case. The diagram isn't as clear as I'd like, but
> it looks like it actuates pads that run inside the periphery of the
> cylindrical part of the brake disk. If that's actually the case, it may
> be fine for parking, I can't see it being of much use as an emergency
> brake.
>
> Smart companies like Saab use the front brakes as parking/emergency
> brakes so that you still have ~70% braking capacity in the case of a
> complete hydraulic failure. They also use dual diagonal braking circuits
> instead of front and rear circuits, so you don't lose more than 50%
> braking capacity if one circuit fails.
>

This being the case, it sure sounds like the person had run the car for
a long distance with the parking brake on to wear our the rear pads well
before the fronts.

Does the Elantra and the Saab actuate the service brakes as parking
brakes using the main hydraulic system or do they use a mechanical
system that somehow actuates the main brakes?

Matt

Re: 05 Elantra GLS 5-Door, Rear brake pads wore out at 14K miles
 

Matt Whiting wrote:
> Brian Nystrom wrote:
>
>> Matt Whiting wrote:
>>
>>> Brian Nystrom wrote:
>>>
>>>> 05and06elantra wrote:
>>>>
>>>>> Well, that's not the case in this situation. And it's my
>>>>> understanding
>>>>> (though I may be wrong) that the parking brake only enages the rear
>>>>> driver's side brake. Therefore, this would not explain the same wear
>>>>> on the passenger's side. My intial thought was that maybe the parking
>>>>> brake wasn't releasing completely, but if my assumption is correct
>>>>> about the parking brake only engaging one set of brakes, that
>>>>> eliminates that as a possiblity as well.
>>>>>
>>>> Don't be so sure. I just checked the online service manual on
>>>> Hyundai Webtech and the parking brake definitely works on BOTH rear
>>>> wheels. For that matter, I've never heard of a car that only used
>>>> one wheel. Remember, in addition to it's parking duties, this is the
>>>> emergency brake that you're supposed to use in case of a hydraulic
>>>> failure in the main brake system.
>>>
>>>
>>>
>>>
>>> I'm not familiar with the Elantra, but does it actuate the normal
>>> service brakes for the parking brake function?
>>
>>
>>
>> Yes, it does.
>>
>>> I'm pretty sure the new Sonata has separate drum brakes for the
>>> parking brake separate from the disc service brakes.
>>
>>
>>
>> That appears to be the case. The diagram isn't as clear as I'd like,
>> but it looks like it actuates pads that run inside the periphery of
>> the cylindrical part of the brake disk. If that's actually the case,
>> it may be fine for parking, I can't see it being of much use as an
>> emergency brake.
>>
>> Smart companies like Saab use the front brakes as parking/emergency
>> brakes so that you still have ~70% braking capacity in the case of a
>> complete hydraulic failure. They also use dual diagonal braking
>> circuits instead of front and rear circuits, so you don't lose more
>> than 50% braking capacity if one circuit fails.
>>
>
> This being the case, it sure sounds like the person had run the car for
> a long distance with the parking brake on to wear our the rear pads well
> before the fronts.
>
> Does the Elantra and the Saab actuate the service brakes as parking
> brakes using the main hydraulic system or do they use a mechanical
> system that somehow actuates the main brakes?

They're cable actuated.

Re: 05 Elantra GLS 5-Door, Rear brake pads wore out at 14K miles
 

Matt Whiting wrote:
> Brian Nystrom wrote:
>
>> Matt Whiting wrote:
>>
>>> Brian Nystrom wrote:
>>>
>>>> 05and06elantra wrote:
>>>>
>>>>> Well, that's not the case in this situation. And it's my
>>>>> understanding
>>>>> (though I may be wrong) that the parking brake only enages the rear
>>>>> driver's side brake. Therefore, this would not explain the same wear
>>>>> on the passenger's side. My intial thought was that maybe the parking
>>>>> brake wasn't releasing completely, but if my assumption is correct
>>>>> about the parking brake only engaging one set of brakes, that
>>>>> eliminates that as a possiblity as well.
>>>>>
>>>> Don't be so sure. I just checked the online service manual on
>>>> Hyundai Webtech and the parking brake definitely works on BOTH rear
>>>> wheels. For that matter, I've never heard of a car that only used
>>>> one wheel. Remember, in addition to it's parking duties, this is the
>>>> emergency brake that you're supposed to use in case of a hydraulic
>>>> failure in the main brake system.
>>>
>>>
>>>
>>>
>>> I'm not familiar with the Elantra, but does it actuate the normal
>>> service brakes for the parking brake function?
>>
>>
>>
>> Yes, it does.
>>
>>> I'm pretty sure the new Sonata has separate drum brakes for the
>>> parking brake separate from the disc service brakes.
>>
>>
>>
>> That appears to be the case. The diagram isn't as clear as I'd like,
>> but it looks like it actuates pads that run inside the periphery of
>> the cylindrical part of the brake disk. If that's actually the case,
>> it may be fine for parking, I can't see it being of much use as an
>> emergency brake.
>>
>> Smart companies like Saab use the front brakes as parking/emergency
>> brakes so that you still have ~70% braking capacity in the case of a
>> complete hydraulic failure. They also use dual diagonal braking
>> circuits instead of front and rear circuits, so you don't lose more
>> than 50% braking capacity if one circuit fails.
>>
>
> This being the case, it sure sounds like the person had run the car for
> a long distance with the parking brake on to wear our the rear pads well
> before the fronts.
>
> Does the Elantra and the Saab actuate the service brakes as parking
> brakes using the main hydraulic system or do they use a mechanical
> system that somehow actuates the main brakes?

They're cable actuated.

Re: 05 Elantra GLS 5-Door, Rear brake pads wore out at 14K miles
 

Matt Whiting wrote:
> Brian Nystrom wrote:
>
>> Matt Whiting wrote:
>>
>>> Brian Nystrom wrote:
>>>
>>>> 05and06elantra wrote:
>>>>
>>>>> Well, that's not the case in this situation. And it's my
>>>>> understanding
>>>>> (though I may be wrong) that the parking brake only enages the rear
>>>>> driver's side brake. Therefore, this would not explain the same wear
>>>>> on the passenger's side. My intial thought was that maybe the parking
>>>>> brake wasn't releasing completely, but if my assumption is correct
>>>>> about the parking brake only engaging one set of brakes, that
>>>>> eliminates that as a possiblity as well.
>>>>>
>>>> Don't be so sure. I just checked the online service manual on
>>>> Hyundai Webtech and the parking brake definitely works on BOTH rear
>>>> wheels. For that matter, I've never heard of a car that only used
>>>> one wheel. Remember, in addition to it's parking duties, this is the
>>>> emergency brake that you're supposed to use in case of a hydraulic
>>>> failure in the main brake system.
>>>
>>>
>>>
>>>
>>> I'm not familiar with the Elantra, but does it actuate the normal
>>> service brakes for the parking brake function?
>>
>>
>>
>> Yes, it does.
>>
>>> I'm pretty sure the new Sonata has separate drum brakes for the
>>> parking brake separate from the disc service brakes.
>>
>>
>>
>> That appears to be the case. The diagram isn't as clear as I'd like,
>> but it looks like it actuates pads that run inside the periphery of
>> the cylindrical part of the brake disk. If that's actually the case,
>> it may be fine for parking, I can't see it being of much use as an
>> emergency brake.
>>
>> Smart companies like Saab use the front brakes as parking/emergency
>> brakes so that you still have ~70% braking capacity in the case of a
>> complete hydraulic failure. They also use dual diagonal braking
>> circuits instead of front and rear circuits, so you don't lose more
>> than 50% braking capacity if one circuit fails.
>>
>
> This being the case, it sure sounds like the person had run the car for
> a long distance with the parking brake on to wear our the rear pads well
> before the fronts.
>
> Does the Elantra and the Saab actuate the service brakes as parking
> brakes using the main hydraulic system or do they use a mechanical
> system that somehow actuates the main brakes?

They're cable actuated.

Re: 05 Elantra GLS 5-Door, Rear brake pads wore out at 14K miles
 

> Matt Whiting wrote:
>
>> Brian Nystrom wrote:
>>
>>> Matt Whiting wrote:
>>>
>>>> Brian Nystrom wrote:
>>> Smart companies like Saab use the front brakes as parking/emergency
>>> brakes so that you still have ~70% braking capacity in the case of a
>>> complete hydraulic failure. They also use dual diagonal braking
>>> circuits instead of front and rear circuits, so you don't lose more
>>> than 50% braking capacity if one circuit fails.
>>>
>>
>> This being the case, it sure sounds like the person had run the car
>> for a long distance with the parking brake on to wear our the rear
>> pads well before the fronts.
>>
>> Does the Elantra and the Saab actuate the service brakes as parking
>> brakes using the main hydraulic system or do they use a mechanical
>> system that somehow actuates the main brakes?
>
>
> They're cable actuated.

How does the cable actuate the hydraulic disk brakes? Is there a
separate set of pads for the parking brake? Does the cable actuate a
separate master cylinder that applies the brakes?


Matt

Re: 05 Elantra GLS 5-Door, Rear brake pads wore out at 14K miles
 

> Matt Whiting wrote:
>
>> Brian Nystrom wrote:
>>
>>> Matt Whiting wrote:
>>>
>>>> Brian Nystrom wrote:
>>> Smart companies like Saab use the front brakes as parking/emergency
>>> brakes so that you still have ~70% braking capacity in the case of a
>>> complete hydraulic failure. They also use dual diagonal braking
>>> circuits instead of front and rear circuits, so you don't lose more
>>> than 50% braking capacity if one circuit fails.
>>>
>>
>> This being the case, it sure sounds like the person had run the car
>> for a long distance with the parking brake on to wear our the rear
>> pads well before the fronts.
>>
>> Does the Elantra and the Saab actuate the service brakes as parking
>> brakes using the main hydraulic system or do they use a mechanical
>> system that somehow actuates the main brakes?
>
>
> They're cable actuated.

How does the cable actuate the hydraulic disk brakes? Is there a
separate set of pads for the parking brake? Does the cable actuate a
separate master cylinder that applies the brakes?


Matt