Question about 1991 Chevrolet Silverado 2500

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Brake problem Can pump up the brakes when truck is not running but when truck is running brakes go all the way to the floor. Have replaced master cylinder, power booster and bled all the brakes. Bench bled the master cylinder. Still can't get them to work. Any ideas

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  • Anonymous May 21, 2009

    My son has a 1992 Saturn sc1, while driving he hit something in the road and broke a brake line. he ended up replacing three lines at the master, (there are 4) and replaced 3 flex lines, it took forever to get all the brakes bled, with the car not running, they pump up, no problem, soon as you start the car, brakes go away, pedal to the floor. Why? We bled the master, more then once, bled all around many times. any ideas?

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  • Chevrolet Master
  • 443 Answers

Do it again .. bleed the master cylinder maybe more than once .. I have had this happen before they are tough sometimes to get to take fluid right .. bleed it again till fluid is really flowing right .. your problem is the master cylinder not blead enough yet .. holler if you have more Jerry

Posted on May 17, 2009

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well, check the brake lines for leakage after adding brake fluid to the full mark. If the brake pedal goes all the way to the floor, it's likely there is a leak somewhere after the master cylinder. If the pedal gets hard after adding fluid, and pumping it several times with the car off, then the master cylinder is still ok.

If air has gotten into the master cylinder, it may have to be bled out on a bench, or using a scanner if that's the way your vehicle is.

Bleeding the Brake System (ABS) Auto Bleed Procedure NOTE: Perform a manual bleeding procedure. If the brake pedal height and firmness results are not achieved, perform the auto bleed procedure below.
NOTE: Perform this procedure when replacing the brake pressure modulator valve or electro-hydraulic control unit.
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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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When you bleed the brakes are you starting with brake furthest from the master cylinder? Also was the master cylinder bench bled? If everything there is okay and you are not getting any air in fluid stream, you could try bleeding the brakes by having some one slowly pump the pedal till it is firm. Then have them let off open first bleeder valve and slowly depress to floor and hold there untol the valve is closed. repeat this at all bleeders. You may want to have car running to do this. Try this and let me know.

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