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