Question about 2001 GMC Jimmy

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Qx4 brake pedal go to the floor. new master cylinder, calipers, pads.

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Posted on Jan 02, 2017

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fixincars
  • 335 Answers

SOURCE: the brake light on the

There is a level switch in the master cylinder if the fluid level is low it will turn on the light and If you pressure or vacuum bleed the brakes you will center the proporting valve switch that warns of low brake pressure in either Front or rear.
Vacuum bleeding I have found to work the best.
Make sure the Park brake lever is all the way released. If you find this informationn helpful please leave me a favorable rating and by all means contact me if I can be of any further help.
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Posted on Aug 10, 2008

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SOURCE: Brake problem

air in the lines,bleed them,check rear brakes

Posted on Apr 18, 2009

rsst
  • 175 Answers

SOURCE: front brakes stay locked up

You may want to replace your flexible feed lines to the calipers. Any little bit of **** in them will not let the brake fluid out of the caliper,

Posted on Jul 29, 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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wracefans24
  • 1985 Answers

SOURCE: 1997 GMC Sierra 5.7 changed master cylinder

check under your master cylinder,is there another clyinder below with one line in and one line out,if you do I found this is for the Abs to the rear,I had to replace this it was full of air,and did exactly what yours is now

Posted on Dec 09, 2009

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2 Answers

2005 Camry. Having difficulty when I apply brakes. Pedal goes almost to floor. Eventually stops. Had brake pads, drums and calipers checked, they seem fine. Any suggestions ?


Low brake pedal almost always indicates a compromised hydraulic system. Check you brake fluid level. If it is ok and you haven't had anything replaced in the brake hydraulics system lately, such as a wheel cylinder or brake caliper, then the primary suspect is the master cylinder.

Jan 02, 2015 | Cars & Trucks

1 Answer

2001 Silverado 2500 HD Why Rear brakes don't work after I installed new hydro-boost power booster, master cylinder, calipers, and pads. I bled master cylinder before installing, and brakes beginn


Hello Patricia,

Have you checked the master brake cylinder reservoir for brake fluid loss?

I don't suspect the master cylinder as you have replaced it... but am more suspect of a leaking brake line or fitting which should have
been discovered when you had the system bled.

The only time I ever had a rear brake problem with a 2500 series Chevrolet was due to seized rear brake caliper guide pins...as your calipers are also new that is not your problem.

If your brake pedal feels spongy and travels to the floor board you have air in the system, a brake fluid leak or a failure in the power steering system, such as a broken hose, broken power steering pump drive belt, or failed pump, would result in a loss of pressure to both the hydro-boost and steering.

Find more information here:

. Hydro Boost Power Assist Systems Operation Diagnosis and Repair

Jul 23, 2017 | 2001 Chevrolet Silverado 2500HD

1 Answer

Brakes go to floor i changed master,4 calipers,4 brake hoses, and all pads


Time to redo the bleeding of the system again...starting with the master cylinder...you do not have to remove the master to re-bleed it. disconnect both brake lines from the master, and start again by pushing pedal to floor, and rebleed each line at the master...this is critical to work properly...you mentioned new master cylinder, if remanufactured I would return it. As noted above, after confirming the master is fully bled...rebleed each caliper beginning with the rear, farthest away from the master...you must have "air" in the brake lines. Hope this helps.

Apr 03, 2012 | 1998 Jeep Grand Cherokee

2 Answers

Just replaced rotors, calipers, caliper brackets, and pads. Bled all four wheels, starting with the farthest away from the master cylinder working my way to the closest. Brake pedal feels firm when car...


Bleed with the car running and make sure all the air is out. Now make sure there is no leak and the pad contact are adjusted without much gap so that the calipers hold on. make sure the servo assist is correct, if so and the master cylinder was set right , it must work. Please recheck all your work once again to trim up.

Sep 28, 2010 | Nissan Xterra Cars & Trucks

1 Answer

Pistons in both front calipers stay out, both calipers replaced


You may have a leak in the booster or master cylinder. You can put a pressure tester on the system to test for leaks. It does sound like you have an air leak.
You can try to bleed the master cylinder, then slave cylinder, then brake lines.

Aug 24, 2009 | 1993 Oldsmobile Achieva

2 Answers

Brake pedel pushes to the floor


pump the pedal about 10 times and see if it comes back up, u need to pump the caliper pistons out after a brake job.

Jun 27, 2009 | 1997 Ford F150 Regular Cab

1 Answer

Brakes to the floor(almost) 99 blazer


bleed the brake again. if the pedal goes to the floor with little resistance, then the master cylinder is your problem.
the shim is to depress the noise when you applied the brake. you can skip that, if the brake works without it.

Apr 29, 2009 | 1999 Chevrolet Blazer

1 Answer

No brakes


Add brake fluid in master cylinder.

Feb 22, 2009 | 1989 Chevrolet K1500

1 Answer

Brakes


All you have to do is take the calipers off crack open the bleeder of the side you are working on leave the old pad in the caliper and press the pad in as far as it will go tighten bleeder clean the rotors with brake clean to get the oily substance off they put on during shipping to keep them from rusting put rotor back in place and put new pads in caliper if they give you grease for the caliper sliders put some on the caliper bolts and sliders the thing the bolts go into on the caliper so they move fairly easy this way your brakes will work better and last longer put caliper back in place tighten caliper bolts snug usually with a ratchet like a good 3/8 ratchet then do the other side fill up the master cylinder with proper brake fluid usually dot3 but should say on master cylinder cap bleed brakes if you did just the front bleed the passenger side first pump pedal a few times dont go all the way to the floor have someone open the bleeder on the right front passenger front while holding pedal down with just a little pressure one foot on pedal one under pedal so it dont go to the floor then do the same for the other side check fluid start vehicle if pedal is good go for a test drive and thats it.

Jan 06, 2009 | 2005 Ford F-150

1 Answer

Peugeot 405 no brake pedal


try a pressure bleeding system on it for the brakes.incidentaly if using the pedal to bleed brakes or getting new pads out to their position gentle use of pedal is advised otherwisw you can reverse the seals in the master cylinder and you wont get any pedal if this happens

Oct 14, 2008 | 1991 Peugeot 405

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