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i have a 91 honda civic that is giving alot of break problems first off this is what i have changed so far the first time it gave me problems i hade to change the rear pasanger piston then the second time i had to change the two front break hoses and the third time i changed the front calipers and the master cilender and the rear drivers piston is not leaking and i blead all of the lineswhen i changed the master cilender and that worked alright for a little while now the breaks went out again and nothing is leaking so what do you think could be wrong with this? i appriciate the feedback thanks.

 
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Well have you tried going to a auto shop just to get the dust out of your front and back break? maybe that helps!

 
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Did you bleed the master cylinder when you put it in.

 
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ok me i think thats should have the the whole break system should be redone, all of it the whole 9 yeards and asap cuz i had a accorrd that did the same thing anc after that it was fine

 
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I forget the name of the part,Its like a master cylinder.It should be on the fire wall,under the hood.Its like a master cylinder except its a booster(about 8" around)Now that I think of it I think its called a brake pump booster assy.They used to make rebuild kits for this(but its not worth it and their not very reliable.Heres your best bet,go to the nearest dealer,have them look it up in the parts book(it shows the exploded view) its easy and its free.Since its a 91 they probably wont have it in stock,they only stock 4 years and back.Youll get a better idea of it and ask for the part number