Braking Systems and Technique Flashcards
6 cards from real PCV practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Braking Systems and Technique flashcards as text
What is the function of a retarder on a PCV?
Answer: It provides supplementary braking without using the wheel brakes, typically using electromagnetic or hydraulic resistance
A retarder supplements the service brakes by slowing the drivetrain through electromagnetic or hydraulic means.
On a PCV with air brakes, what happens if the air pressure drops below the minimum safe level?
Answer: The spring parking brakes apply automatically, bringing the vehicle to a stop
Spring parking brakes apply automatically when air pressure drops below a safe level, providing a fail-safe mechanism.
Progressive braking technique means:
Answer: Applying brakes gently at first, increasing pressure as needed, then easing off just before stopping for a smooth halt
Progressive braking involves a smooth build-up and release of brake pressure for passenger comfort and vehicle control.
Why is it important to test your brakes soon after driving through deep standing water?
Answer: Water on brake surfaces can dramatically reduce braking efficiency, and light braking helps dry them
Water on brake surfaces reduces friction. Light braking generates heat to dry them and restore effectiveness.
What is the approximate stopping distance of a coach travelling at 60 mph on a dry road?
Answer: About 96 metres
At 60 mph, a heavy coach needs approximately 96 metres to stop, including thinking and braking distance.
When would you use the parking brake rather than the footbrake to stop your PCV?
Answer: Whenever parking or as a secondary brake in an emergency
The parking brake secures the vehicle when parked and can serve as an emergency secondary brake if the service brakes fail.