recently replaced left rear caliper. at that time replaced all pads and
turned all rotors. all has been fine up until the last two weeks. after
a few moments of engine on time, my brake pedal starts getting hard (no
evidence of travel) after a short period when i need to slow down i don't
need to depress the brake pedal as the car will come to a stop on it's
own. this problem is itermitent. i have told that it could be the abs
pump. anyone have any ideas???

Thanks,

Larry