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prop valve vs master cylinder??

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by Max, Oct 4, 2001.

  1. Max

    Max 1/2 ton status

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    Durham, NC
    Anybody know of any ways to test if a proportion valve is bad and/or how to differentiate between that and a bad master cylinder?? I am on my 3rd *rebuilt* MC, the first 2 went after only a few drives. Could a bad prop valve be killing them? Heat in the engine compartment?? How much fluid should be in them when cold, ie what height under the lip??

    thanx in advance for all help
     
  2. Steve_Chin

    Steve_Chin 1/2 ton status

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    A proportioning vavle shouldn't be capable of killing a master cylinder. FWIW, I have been through some serious headaches with rebuilt master cylinders (internal leakage, probably due to not honing or honing them too far). I will either only rebuild them myself or get new ones from here on out.
     

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