brake problems

1997 PONTIAC GRAND PRIX
180,000 MILES • 6 CYL • FWD • AUTOMATIC
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EP11379
  • MEMBER
  • 1 POST
i replace the front calipers and master cylinder because of contaminated brake fluid. right now the pedal gets hard if pump it 2 or 3 times (i can push it to the floor if i push hard enough) then as soon as i start the car it goes to the floor. there are no leaks that i can see under the car
May 3, 2011 at 9:53 PM
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CARADIODOC
  • CAR REPAIR CONTRIBUTOR
  • 34,308 POSTS
You MUST replace all rubber parts that contact the brake fluid. That includes rear wheel cylinders, rubber hoses, and the combination valve under the master cylinder. Until you do, the contamination will leach out of them and ruin your new parts again. The steel lines must be flushed and dried too.

Once all the rubber parts are replaced, do the normal bleeding process, then we'll continue on if necessary. You do not have to replace the power booster because its rubber diaphragm doesn't come in contact with brake fluid. If the car has anti-lock brakes, the hydraulic controller must be replaced too because it has rubber seals and o-rings inside.
Mar 16, 2021 at 5:06 PM
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