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Why can wet spring brakes be a problem if the parking brakes are set overnight in freezing weather?
- A.Wet brakes always release too early
- B.Freezing makes the springs stronger forever
- C.The brakes can freeze in the applied position, and the vehicle may not move until they thaw
- D.Cold has no effect on wet brake parts
Correct answer
C. The brakes can freeze in the applied position, and the vehicle may not move until they thaw
Why
Water between linings and drums can ice the brakes solid while parked. When freezing is likely, drivers avoid setting parking brakes on wet brakes where safe alternatives exist and instead chock the wheels after the brakes dry.
Manual topic: Air Brakes - Spring Brakes and Parking Brakes · From the Air Brakes practice bank (AB-114).