Middle rear disc brake

[Bob Dunahugh]

As a thought. The problem is showing up at all 6 wheels. The only parts that affect all 6 wheels. Is the master brake cylinder, and the perportioning valve. His GMC doesn't have a P valve. ( PO removed it.) The problem is the P-30 MC. I had one once for about 5 months. Then removed it. That MC for our application has issues. Not going into the details of those issues here. You can PM me.
Bob Dunahugh
78 Royale since 2003.
4 COPO Yenkos

 

[jim kanomata1]

Bob,
If nothing else the Distribution valve( Proportional ) will signal when the
pressure of the front and rear are way off and the brake light will come on.
Bob Stone has uncovered some things relating to Volume of fluid.

> As a thought. The problem is showing up at all 6 wheels. The only parts
> that affect all 6 wheels. Is the master brake cylinder, and the
> perportioning valve. His GMC doesn't have a P valve. ( PO removed it.) The
> problem is the P-30 MC. I had one once for about 5 months. Then removed it.
> That MC for our application has issues. Not going into the details of those
> issues here. You can PM me.
> Bob Dunahugh
> 78 Royale since 2003.
> 4 COPO Yenkos
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> GMCnet mailing list
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--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk
http://www.gmcrvparts.com
1-800-752-7502