Understanding a Combination Valve

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Combination valves are common on most classic cars from the 1960s forward. This valve is often misrepresented as the proportioning valve, however the combination valve actually contains three distinctly different functions. Mark Simpson explains the different components within the combination valve and exactly how they function together.

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2 Responses to “Understanding a Combination Valve”
  1. Jerry

    Could the Combination Valve be the cause of my front disk brakes locking up upon activation…It’s an 80 model 1 ton chevy truck, I have repaced the calipers and master cylinder, and when the brakes are applied, they lock up and I have to bleed them to move the vehicle…Thank You, Jerry Lindsey

    Reply
    • Customer Service

      Hello Jerry,

      There is no ABS unit in your truck, so if you’ve replaced the front calipers and master, I would probably consider replacing the combination valve.

      The seals inside breakdown over time and it is likely it has never been replaced on a nearly 40-year old truck.

      It is possible the valve is clogged of malfunctioning.

      Thanks,
      Mark CCRC Video Membership

      Reply

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