Question about 1996 GMC Sierra

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I Hanve 1996 GMC 1500 brake pedal goes to floor. New brakes & Calipers in front, 1 new wheel cylinder. 3 New master cylinders,1 new brake booster, Brake line in rear rusted out & replaced. Have checked rubber lines for collasping or bubbling, When Bleeding all wheels lock, Have vacum bled and manual bled. Tried different ideas, do not touch brake until bleeder is open and depress and close bleeder. Tried just about everything, Have adjusted rear brakes out. When truck not running you can pump up brakes, when you start the truck the brakes will go to floor, will not pump up when running.

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  • cheap repair Sep 29, 2010

    did you bench bleed the master cylinder before installing it?

  • khans61 Sep 30, 2010

    I have bled out the master cylinders, third one bled them all.

    I also have bled before and after the abs fluid is fine no air. This truck has had over a galon and a half bled thru it.

    It has been vacum bled and manual

  • cheap repair Sep 30, 2010

    http://www.aa1car.com/library/abs_bleedi...

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Did you try a brake booster ?

Posted on Oct 10, 2010

  • wpassmore Oct 31, 2010

    It sounds like you still have a brake line leaking. A common leak is in the front where the brake line crosses over to the right side under the radiator

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I have replaced 3 disc brake calipers on my 2001 pt cruiser. after bleeding all 4 brakes 3 times, I started the car and brake pedal goes to floor. is my brake booster shot?


Michael:

You must start bleeding the brakes at the wheel farthest from the master cylinder (usually the right rear), then the next farthest from the master cylinder, then the next, then the closest. If your master cylinder is at the left front of the car, start with the right rear, then the left rear, then the right front, then the left front. If you don't bleed the brakes in the correct order, you are just shifting the air in the lines from one line to another. Make sure that you close the bleeder before letting the brake pedal up, and the engine should not be running when you bleed the brakes... Make sure that the emergency brake is off. Make sure that the master cylinder does not run out of brake fluid at any time that you are bleeding the brakes.

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Brake pedel goes to floor & no brakes. I changed rotors & pads 4 mos ago. Has fluid in resevior. Can`t get to pump up.


check the master cylinder. it can go bad without leaking. the fluid bypasses the internal cups causing a fall in the pedal. also if you broke the lines lose to do calipers you might have air in the system bleed it good. if not i suspect the master cylinder

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Hard to push brake pedal down to stop.


1. Check brake fluid level and look for leaks in the brake lines and at the calipers.
2. Bleed the brake fluid completely and replace with fresh fluid (google search: how to bleed brakes). Then bleed air by having someone press the brake pedal 4-5 times, then press and hold while you open the bleed valve and close when fluid streams out. start with the rear wheel (if 4wheel disc brakes) then move to the front.
3. Replace Master Cylinder (sorry, but if 1 or 2 didn't fix it, this is the last option) This is usually over $150, and will involve step 2 again when completed.

Good luck, hope this helps.

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