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Hey. I have a 2001 gmc jimmy. Brake pedal is to the floor, whether running or not, i go to a bottle of breakfluid every week, no visible leaks. Please help!!?

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  • Cars & Trucks Master
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Remove the vacuum hose to the brake booster and check for oil wetness inside. Check under the floor mat for brake fluid inside car. Check carefully all calipers for oil leaking at pistons.

Posted on Apr 26, 2013

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Posted on Jan 02, 2017

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freetek
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SOURCE: 96 Honda Odyssey brake trouble

I'm pretty sure that vehicle will have a vacuum booster for brake assist and it may be failing or you may have cracked or loose vacuum line.
Another possibility is a defective vacuum reservoir; a canister device, sometimes metal, sometimes plastic that supplies a bit of vacuum in case the engine shuts down.

Normally mounted on the firewall under the hood, the booster shouldn't be tough to replace and appears to be a metal drum, often with the master cylinder assembly directly attached.

Checking the operation of the power brake assist is easy; with the engine off, press firmly on the brake pedal and note whether it sinks noticeably when you start the engine.
If it does, then the vacuum booster is working, if not all the time.
Considering the random nature of the problem, I would try this several times to see if the resulting drop in pedal height is constant or not.

Posted on Sep 03, 2008

  • 314 Answers

SOURCE: brake problem

Hi Tora, Go to the back brakes. This is where the prob could be. But with you bleeding the brakes, the peddle has went beyond its normal travel causing the rubbers in the master cylinder to get messed up. Happens too often! Replace the master cylinder 'after' you had a good look at the back! Frankster016

Posted on Oct 25, 2008

  • 474 Answers

SOURCE: 95 F250 Diesel.Vacuum assist Brake Master Cylinder

you may have to bleed your abs sys. this is best done with a computer

Posted on Sep 12, 2009

  • 1201 Answers

SOURCE: Brake pedal still goes to floor 2000 GMC Jimmy

It's very possible to be the master cylinder, the o-rings on the piston could be worn, letting the fluid seep back through instead of getting full pressure through the lines. Could also be the brake booster.
Try changing the master cylinder first, which is cheaper and easier, and see if there is a difference, you'll need to bleed the brakes again.
To check the booster,
With the engine off, pump the brakes until the pedal is hard, then hold pressure on the brake pedal and listen for air escaping, or the pedal goes slowly to the floor, Do that after the master cylinder has been changed, at least that will be eliminated.

Posted on Sep 15, 2009

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emissionwiz
  • 76132 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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It's very possible to be the master cylinder, the o-rings on the piston could be worn, letting the fluid seep back through instead of getting full pressure through the lines. Could also be the brake booster.
Try changing the master cylinder first, which is cheaper and easier, and see if there is a difference, you'll need to bleed the brakes again.
To check the booster,
With the engine off, pump the brakes until the pedal is hard, then hold pressure on the brake pedal and listen for air escaping, or the pedal goes slowly to the floor, Do that after the master cylinder has been changed, at least that will be eliminated.

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