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Brake Experts I have a question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Lazydog, Oct 5, 2002.

  1. Lazydog

    Lazydog 1/2 ton status

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    I have a 1978 GMC Jimmy. My question concerns the proportioning valve. It looks like there is a 1 1/2 inch fitting between the valve and the brake line to the rear brakes. That fitting is leaking. It actually looks like there is a blowout valve on the side up against the frame. The dealer parts guy said these things do leak over time. Is that right? The new valve is $90.00 so I thought I'd get a second opinion before purchasing.

    Thanks
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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  3. 79Beast

    79Beast 1/2 ton status

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    Sounds like a junkyard part is needed. I've never seen one leak before. I have one I'll sell you for $10 off of a 74 Blazer. Also, it's a splitter block...not a proportioning valve. It should be mounted on the crossmember in front of the engine.
     

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