FLAT BRAKE

  • Tiny
  • nuaka
  • 1996 Chevrolet Truck
  • 2WD
  • automatic

96' chevy 1500 2wd 5.7 replaced master cylinder, brake booster. Brake pedal still falls to floor. NO LEAKS!What is Wrong?

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Friday, June 10th, 2011 AT 3:49 PM

7 Replies

  • Tiny
  • caradiodoc
  • Expert
  • 25,451 posts

Did this start before you replaced the parts? Did you bench-bleed the master cylinder?

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Friday, June 10th, 2011 AT 6:07 PM
  • Tiny
  • nuaka
  • Member

Yes, that was the reason I replaced the parts. I bleed the entire brake system.

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Monday, June 13th, 2011 AT 3:47 PM
  • Tiny
  • caradiodoc
  • Expert
  • 25,451 posts

Did you bench-bleed the master cylinder before you installed it? Does it sit at an angle with the front higher than the back?

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Monday, June 13th, 2011 AT 7:48 PM
  • Tiny
  • nuaka
  • Member

No, I bleed the system after installing the new master cylinder, brake booster, new wheel-cylinders; and new rear shoes. No, the truck does not sit higher on either end, it sits level.

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Thursday, June 16th, 2011 AT 1:55 AM
  • Tiny
  • caradiodoc
  • Expert
  • 25,451 posts

Not the truck; the master cylinder.

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Thursday, June 16th, 2011 AT 1:59 AM
  • Tiny
  • nuaka
  • Member

We already replaced the ABS unit. We believe that's what was causing the brakes not to work. But we are still waiting on response of customer. However, I believe the master cylinder was level.

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Thursday, June 16th, 2011 AT 10:42 PM
  • Tiny
  • caradiodoc
  • Expert
  • 25,451 posts

Rats. A lot of GM master cylinders sit higher in the front and air hangs up right by the steel line. It has to go downhill to be bled out at the wheels or to get sucked back into the reservoir. Bleeding at that connection usually solves the mushy pedal.

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Friday, June 17th, 2011 AT 2:48 AM

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