Question about 2006 Buick LaCrosse

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My brake pedal is spongy

Resivior is full, expandable cap seal was fully expanded

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You have to bleed the brake system, starting from the fares bleeder to the closest one( the one under the reservoir)The car engine has to be on while you are doing it.

Posted on Jan 21, 2013

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1997 petrol brakes coming on by themselves rock hard pedal when happens. If left for a while can be driven again although the brake pedal becomes spongy.


I guess either the brake pedal linkage is maladjusted or perhaps not fully returning so the master cylinder fluid inlet is remaining closed. In that condition when the brake fluid expands as it grows warm under normal use it cannot escape back into the reservoir and so the brakes are applied until the system cools down.

You can check this quite simply - when next the brakes are applied momentarily release one or two brake bleed *******. If that frees the brakes it will be time to take a close look at the pedal linkage.

The condition also sometimes occurs after the replacement of the brake booster and/or brake master cylinder by folk throwing new parts at the car instead of fitting them..
There must be a clearance between the brake booster pushrod and the master cylinder piston and in the absence of service tools , careful and precise measurements must be made.

I once had a car where the brake booster failed due to fluid leaking from the master cylinder and the brakes would auto apply and not release on that car.

May 25, 2017 | Cars & Trucks

1 Answer

I have an 01 GMC Jimmy 4.3L 4WD & we are trying to bleed the brakes but the scanner says my vehicle is going 3MPH so we manually bleed the brakes but the pedals still easily is pushed to the floor.


Bad master cylinder . What are you using a scan tool for ? No need Unless your Installing a new Electro-Hydraulic Control Unit (EHCU) or new Brake Pressure Modulator Valve (BPMV).
Hydraulic Brake System Bleeding (Manual)
Caution: Refer to Brake Fluid Irritant Caution in the Preface section.
Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in the Preface section.
Place a clean shop cloth beneath the brake master cylinder to prevent brake fluid spills.
With the ignition OFF and the brakes cool, apply the brakes 3-5 times, or until the brake pedal effort increases significantly, in order to deplete the brake booster power reserve.
If you have performed a brake master cylinder bench bleeding on this vehicle, or if you disconnected the brake pipes from the master cylinder, you must perform the following steps:
3.1. Ensure that the brake master cylinder reservoir is full to the maximum-fill level. If necessary add GM approved brake fluid from a clean, sealed brake fluid container. Refer to Fluid and Lubricant Recommendations.
If removal of the reservoir cap and diaphragm is necessary, clean the outside of the reservoir on and around the cap prior to removal.
3.2. With the rear brake pipe installed securely to the master cylinder, loosen and separate the front brake pipe from the front port of the brake master cylinder.
3.3. Allow a small amount of brake fluid to gravity bleed from the open port of the master cylinder.
3.4. Reconnect the brake pipe to the master cylinder port and tighten securely.
3.5. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal.
3.6. Loosen the same brake pipe to purge air from the open port of the master cylinder.
3.7. Tighten the brake pipe, then have the assistant slowly release the brake pedal.
3.8. Wait 15 seconds, then repeat steps 3.3-3.7 until all air is purged from the same port of the master cylinder.
3.9. With the front brake pipe installed securely to the master cylinder, after all air has been purged from the front port of the master cylinder, loosen and separate the rear brake pipe from the master cylinder, then repeat steps 3.3-3.8.
3.10. After completing the final master cylinder port bleeding procedure, ensure that both of the brake pipe-to-master cylinder fittings are properly tightened.
Fill the brake master cylinder reservoir with GM approved brake fluid from a clean, sealed brake fluid container. Ensure that the brake master cylinder reservoir remains at least half-full during this bleeding procedure. Add fluid as needed to maintain the proper level.
Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm.
Install a proper box-end wrench onto the RIGHT REAR wheel hydraulic circuit bleeder valve.
Install a transparent hose over the end of the bleeder valve.
Submerge the open end of the transparent hose into a transparent container partially filled with GM approved brake fluid from a clean, sealed brake fluid container.
Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal.
Loosen the bleeder valve to purge air from the wheel hydraulic circuit.
Tighten the bleeder valve, then have the assistant slowly release the brake pedal.
Wait 15 seconds, then repeat steps 8-10 until all air is purged from the same wheel hydraulic circuit.
With the right rear wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the right rear hydraulic circuit install a proper box-end wrench onto the LEFT REAR wheel hydraulic circuit bleeder valve.
Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11.
With the left rear wheel hydraulic circuit bleeder valve tightened securely, after all air purged from the left rear hydraulic circuit, install a proper box-end wrench onto the RIGHT FRONT wheel hydraulic circuit bleeder valve.
Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11.
With the right front wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the right front hydraulic circuit, install a proper box-end wrench onto the LEFT FRONT wheel hydraulic circuit bleeder valve.
Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11.
After completing the final wheel hydraulic circuit bleeding procedure, ensure that each of the 4 wheel hydraulic circuit bleeder valves are properly tightened.
Fill the brake master cylinder reservoir to the maximum-fill level with GM approved brake fluid from a clean, sealed brake fluid container.
Slowly depress and release the brake pedal. Observe the feel of the brake pedal.
If the brake pedal feels spongy, repeat the bleeding procedure again. If the brake pedal still feels spongy after repeating the bleeding procedure, perform the following steps:
21.1. Inspect the brake system for external leaks. Refer to Brake System External Leak Inspection.
21.2. Pressure bleed the hydraulic brake system in order to purge any air that may still be trapped in the system.
Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated.
Important: If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and repaired.
If the brake system warning lamp remains illuminated, refer to Symptoms - Hydraulic Brakes

Feb 26, 2017 | GMC Cars & Trucks

1 Answer

1999 Ford F-150 XLT 2wd all disk 5.4 I have recently replaced my passenger front caliper brakes and rotor. I have bled the brakes several times and am still experiencing a spongy pedal when I bleed the...


Do it in sequence and bleed furthest away one first, probably rr then next furthest, probably lr then fr then fl.
Do it the old school way with 2 people. 3 pumps, hold, crack it.
Make sure your full of fluid and dont forget the cap!

May 08, 2017 | Ford Cars & Trucks

1 Answer

Brakes not working right


Air is getting into the system hence the spongy feel to the pedal. The problem may lie with the brake assist system - have it checked professionally - brakes matter!

Jan 30, 2014 | 2002 Mercury Sable

2 Answers

Spongy brake pedal. A stumper!


try adjusting the rear brake shoes up
the indications are that there is too much shoe to drum clearance so the shoes have to be expanded out to touch the drum and that is about a pedal travel length
try also bleed the master cylinder first at the lines connections as it it is very possible that air is locked in the master cyl and it is not getting a full load of fluid to bleed properly

Mar 27, 2017 | Cars & Trucks

1 Answer

Good brake pedal till i start the truck then it gets soft


You need to adjust up the rear brakes and also check back there for leaking wheel cylinders and maybe even a bad bearing in the axle assembly, worn shaft,accompanied by a leaking axle seal that will appear really nasty and smell bad too...

I have also seen this model with a crappy pedal when the brake hoses have become softened and expand under pressure

Jul 28, 2012 | 1988 Chevrolet C1500

3 Answers

My 97 Chevy Blazer has spongy brakes. Master cylinder was replaced and brake booster was replaced. Braked lines were bled and brakes are still spongy. Can anyone help?


you must have air trapped in the system still, dont drive this car until this problem is fixed, please, for safety reasons. if you dont know how to bleed the brakes have a professional do the work. the fluid might have been contaminated and should be totally reserviced, DOT 3 fluid or better.
can you rate this!

May 09, 2010 | 2006 Fiat 124

1 Answer

Is there a special way to bleed the brake system on a 2001 catera


  1. Place a clean shop cloth beneath the brake master cylinder to prevent brake fluid spills.
  2. With the ignition OFF and the brakes cool, apply the brakes 3-5 times, or until the brake pedal effort increases significantly, in order to deplete the brake booster power reserve.

Fill the brake master cylinder reservoir with DOT-3 brake fluid from a clean, sealed brake fluid container. Ensure that the brake master cylinder reservoir remains at least half-full during this bleeding procedure. Add fluid as needed to maintain the proper level. Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm.
  1. Install a proper box-end wrench onto the RIGHT REAR wheel hydraulic circuit bleeder valve.
  2. Install a transparent hose over the end of the bleeder valve.
  3. Submerge the open end of the transparent hose into a transparent container partially filled DOT-3 brake fluid from a clean, sealed brake fluid container.
  4. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal.
  5. Loosen the bleeder valve to purge air from the wheel hydraulic circuit.
  6. Tighten the bleeder valve, then have the assistant slowly release the brake pedal.
  7. Wait 15 seconds, then repeat these steps until all air is purged from the same wheel hydraulic circuit.
  8. Repeat this procedure with the LEFT FRONT, then LEFT REAR and finally the RIGHT FRONT.
  9. Fill the brake master cylinder reservoir to the maximum-fill level with DOT-3 brake fluid from a clean, sealed brake fluid container.
  10. Slowly depress and release the brake pedal. Observe the feel of the brake pedal.

Feb 27, 2010 | 2001 Cadillac Catera

2 Answers

Spongy brake pedal


I have a 2001 Chevy 1500 4 X 4 that recently had all new pads, rotors, and calipers installed. Since then my brake pedal goes almost to the floor before I get any brakes. I took it back to the shop and they bled the brakes with no better results. I bled them also with no results. I took the truck back and they installed a master cylinder with no results. It's now at the Chevy dealer and they say it's normal - BS! I had good brakes before I had all of the brake parts replaced, no one can figure it out. If you have a load in the truck or if you tow anything you better be looking at the ditch to avoid an accident. The original brakes would put you nose into the windshield and now I could stop it better the Fred Flinstone way. Anyone have an answer????????

Jun 18, 2009 | 1998 Chevrolet C1500

1 Answer

SPONGY BRAKE PEDAL


spongy brake pedal indicates air in the system... have the brakes inspected for leaks as it leaks when you apply the brakes and sucks in air when you release them.

Robert

Dec 17, 2008 | 2008 Toyota Camry

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