Question about 2001 GMC Jimmy
Replaced calibers tried to bleed brakes but still the brake pedal goes to the floor
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: excessive brake pedal travel
Do you need new pads? Did you try to bleed the master cylinder? Are you sure you bled the system correctly? Excessive travel is almost always air in the lines of not enough brake fluid.
Posted on Aug 10, 2009
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
Testimonial: "Hadn't thought about the O-rings on the rod thanks for the idea. Great Idea Thanks!"
SOURCE: How do I bleed the brakes.
This is not something you can do yourself. you will need an assistant.
Each wheel will need to be done.
Jack up the vehicle and support it safely.
Remove the tire.
Locate the bleeder device on the top of the caliper.
Attach a length of hose from the bleeder valve into a bucket.
Fill the brake fluid reservoir.
Loosen the bleeder valve (approximately 1/4 turn) and have your assistant push the brake pedal.
If no fluid comes out - loosen the bleeder valve until fluid starts coming out.
Once fluid stops coming out... tighten the bleeder back and have your assistant let the brake pedal up
Tell the assistant to press down slowly to the floor... and loosen the bleeder again.
Once the pedal is to the floor - and fluid stops coming out - re- tighten the valve.
Repeat until only fluid comes out - no bubbles.
If after all 4 tires are done, and there is still sponginess in the pedal, it is likely a more sever problem like the master cylinder, equalizer, or booster.
Most chain shops (Midas, Sears, etc) offer a free inspection service, and if it is simply air in the lines can bleed the system for you for under $35. (well worth it)
It will take you approximately 2-3 hours if you have never done it before (assumed because you dont know how) and they can do it with a bleeder machine in less than 1.
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Posted on Sep 24, 2009
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