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IR & Haldex information

Stopping the Big Rigs - Quiz 7


The function of the two-way check valve in the anti-compounding system is to seek out the dominant pressure between:

  1. The primary and secondary reservoirs

  2. The dash-park valve and the foot valve air and send it to the spring chambers

  3. Both A & B


Anti-compounding is not found on all vehicles but compounding can cause broken brake adjusters, cracked brake drums and twisted s-cams.

  1. True

  2. False


The anti-compounding system:

  1. Will release the spring brakes at the same time and in proportion to the driver's application of the service brakes

  2. Is mandated by FMVSS-121 law

  3. Is found in the front brake system


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