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1990 Chevrolet Truck back drum brakes

Tiny
PHILLIP J PORRAS
  • MEMBER
  • 1990 CHEVROLET TRUCK
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 77,000 MILES
My front brakes have fluid and can be bled but when I tried to bleed the back drum brakes I have no fluid. Master cylinder, proportioning valve has been replaced, both wheel cylinder. Still no fluid.
Monday, July 20th, 2015 AT 10:21 AM

3 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
Do you have the truck supported on jack stands under the frame? If so, you likely have a height-sensing proportioning valve at the rear axle that is limiting fluid flow. Support the truck by the rear axle so the body sits lower on the frame.
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Monday, July 20th, 2015 AT 8:09 PM
Tiny
PHILLIP J PORRAS
  • MEMBER
  • 1 POST
Yes.
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Tuesday, July 21st, 2015 AT 8:39 AM
Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
Yes, what? It's on jack stands under the frame or moving them to the axle solved the problem?
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Tuesday, July 21st, 2015 AT 6:23 PM

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