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Have a 92 olds 98. the car has newer front brakes on it. The back brakes a fine. Before you start the car the pedal is fine. after start up it goes to the floor. Is it the power booster ?

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You just need to bleed your brakes until you get a decent pedal if that don't work cheek your brake lines for leaks

Posted on Aug 01, 2013

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Posted on Jan 02, 2017

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SOURCE: 97 ford e350 brake pedal goes to the floor...

1992 Ford E350-same brake concern, pedal goes to floor! Replaced master cylinder, brake booster, frt pads and rotors. Replaced rear shoes wheel cylinders, and drums, vehicle stops but pedal goes to floor, squeaze off rear flex hose and pedal is solid. Takes 2 > 3 pumps normally to get hard pedal then goes to floor, wouding in longer brake wheel cylinder pins would fix the problem???? P/S hope you can help.

Posted on Nov 17, 2008

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SOURCE: Brake goes to floor with new mater cylinder question about power booster

If your pressure is good in till you start your truck it is the power booster. i just fixed this problem. If it is not your master then that is the problem. I had to replace the whole brake system to find this out.
Tim

Posted on Dec 18, 2008

  • 1 Answer

SOURCE: pedal goes to floor on 92 F250

I would strongly recommend checking your trucks R.A.B.S. (Rear Antilock Brake System) valve . It is located on the left frame rail just under where your left foot would rest . They can leak internally and exhibit the problems you are describing (loss of pedal , with no fluid loss) .
It is highly unlikely that a power booster would cause this , as a failed booster will show itself in these ways . 1) a hissing sound when you apply the brakes (indicates a vacumm leak) 2) rough engine idle/stalling when brakes applied (also indicates a vacumm leak) or 3) No power assist (brake pedal hard to push) .
If you do discover your hydraulic problem is in your RABS valve , don't forget to bleed it ,(there is a bleeder valve on it) and the rear brakes again after you replace it .
Hope this helps
Doug

Posted on Feb 06, 2009

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SOURCE: 1998 chevy s10- brake pedal goes to the floor-

Did you put fresh fluid in the master cylinder? I really think you still have air in the lines. To bleed manually, start with the bleeder the greatest distance from the master cylinder, car running, helper pushing down about half way on brake pedal and releasing 3 times, on 3rd time, holding pedal down to half way depressed point while you open the bleeder valve. Repeat until you are sure all air has been flushed out. Check master cyl reservoir level often, because if it gets low and you **** air into the system, you have to start all over again. Go to wheel next greatest distance from master cyl, repeat above, working your way to wheel closest to master cyl last.

Posted on Apr 12, 2009

emissionwiz
  • 76691 Answers

SOURCE: brake pedal dropping to floor

do u have the antilock brake bleeding tool? if not you will need to have the dealer bleed the brakes, the ABS control valve must be electricaly held open to bleed the brakes there of course is a special tool for this.

Posted on Oct 18, 2009

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