losing pressure in the brake pedal?

1992 OLDSMOBILE 88
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KHUGHES91
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at first after sitting for a while the pressure will build back up however after driving for a short period and hitting the brakes a few times the pressure starts to give out until eventually you have to press the pedal all the way to the floor also it will sometimes lose pressure while already stopped and force you to move slightly i have already tried bleeding the brake line however i didn't drain the brake fluid completely and it is a rusty color before i pay for a new master cylinder i was wondering what else could be causing this problem
Apr 30, 2012 at 2:28 AM
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JACOBANDNICKOLAS
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Check for leaks in the system. If there are none, chances are the MC is bad.
Apr 30, 2012 at 2:49 AM
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CJ MEDEVAC
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SOUNDS LIKE AIR IN THE LINE---IF YOU HAVE REAR DRUM BRAKES, THEY MAY NEED ADJUSTING OUT TOWARD THE DRUM

SEE MY ANSWER ON THIS POST

https://www.2carpros.com/questions/1999-ford-f-150-brakes--3

SOMETIMES PEOPLE JUST WEREN'T TAUGHT HOW TO BLEED BRAKES AND MOST 1ST TIMERS THINK THEY CAN "WING IT"----REALLY TRY TO UNDER STAND THE BLEEDING PART IN THE LINK

YOU TUBE HAS GOOD VIDEOS AND NOT SO GOOD---MAKE A GOOD JUDGEMENT CALL IF YOU ATTEMPT THEIR METHODS TO DO YOU REPAIRS

I RECOMMEND YOU USE A REPAIR MANUAL AS "LAW" AND VIDEOS AS A GUIDE

https://www.2carpros.com/questions/2007-ford-taurus-tune-up

LET US KNOW HOW THINGS ARE GOING

THE MEDIC
Apr 30, 2012 at 3:04 AM
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