Parking or emergency brakes of trucks and buses can be legally held on by ____ pressure.

Question

Accepted Answer

C: Spring. Since air pressure will eventually leak away with time, emergency brakes must be activated and held by mechanical force. All commercial trucks require emergency brakes. Currently, those are spring-loaded mechanical brakes.

Parking or emergency brakes of trucks and buses can be legally held on by ____ pressure.

Iowa CDL Air Brakes Test Info