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IM working on a 96 GMC Sonoma 4X4

Tiny
ANONYMOUS
  • MEMBER
  • 1996 GMC SONOMA
Im working on a 96 gmc sonoma 4x4. I had to replace rear wheel cylinders and rear brake lines since they were rusted out. I bleed the brakes and the brake pedeal is nice and firm. But when I start it the brake pedal loses all prusure and the brakes hardly work. As soon as I turn the truck off and pump them I get hard firm brake pedal again. Abs light has been on for a long time im told and is still on. Also when the truck is running and the brake is applyed the brake light comes on. Any ideas where to look next to fix it?

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Sunday, February 10th, 2013 AT 6:18 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
If the bleeding was done with a helper pushing the pedal and it was run more than half way to the floor, most likely the master cylinder was damaged and will need to be replaced.
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Monday, February 11th, 2013 AT 9:20 AM

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