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Author Topic: brake issue... could it be the proportioning valve??  (Read 11645 times)

Offline pholliday1

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Re: brake issue... could it be the proportioning valve??
« Reply #15 on: January 18, 2013, 09:57:34 am »
The master cylinder is based on certain close tolerances. In a rush to "refurbish" these master cylinders sometimes close enough appears to the motto of some of these companies. My last problem with this issue resulted in a "new" master having tolerances .008 out of spec. which is a football fied of difference.
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1991 V3500 CREWCAB SRW 454TBI GMC
1991 v3500 crewcab SRW 454tbi 480le 6" lift
1990 V3500 crewcab Dana 60 FF 14b 5:38 ratio 40 inch 11" lift
1989 v3500 crewcab 454TBI 5" lift

Offline howlinwolf

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Re: brake issue... could it be the proportioning valve??
« Reply #16 on: January 18, 2013, 10:37:48 am »
meh cant argue with that logic.
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Offline gildardo01

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Re: brake issue... could it be the proportioning valve??
« Reply #17 on: January 18, 2013, 11:08:47 am »
Quote from: pholliday1 on January 18, 2013, 09:57:34 am
The master cylinder is based on certain close tolerances. In a rush to "refurbish" these master cylinders sometimes close enough appears to the motto of some of these companies. My last problem with this issue resulted in a "new" master having tolerances .008 out of spec. which is a football fied of difference.
that makes perfect sense, maybe the bore tolerance is out of range and that's why it won´t build pressure for the rear breaks..
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