Test 1 Brakes Flashcards
2) if air pressure does not build up to normal within the correct amount of time, then:
Your air pressure may drop too slow during driving, requiring an emergency stop.
1) emergency stab braking is when you:
Brake as hard as you can, release the brakes when the wheel lock, and put on the brakes again when the wheels start rolling
3) which of these is not a
Proper time to apply the parking brakes?
If the brakes very hot ( e.g. After just coming down a steep grade )
4) excessive use of the service brakes results in overheating, which can lead to:
Expansion of the brake drums
5) the proper method of braking when going long and/or steep grades after selecting the proper gear is to brake until your speed is about_miles per hour below your “ safe “ speed, then release your brakes.
5
6) under normal conditions, in order to engage the parking brakes the driver must first:
Let the air out of the air brake system
7) total stopping distance for air brakes is longer than that for hydraulic brakes due to_distance.
Brake lag
8) if you must make an emergency stop, you should brake so you:
Can steer and so your vehicle stays in a straight line
9) if your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
Release the spring emergency/parking brakes to move a short distance
10) the driver must be able to see a warning before air pressure in the service air thanks falls bellow_psi.
55
11) to check the free play of manual slack adjusters on S-cam brakes, you should park on:
Level ground, chock the wheels, and turn off the parking brakes
12) a straight truck or bus air brake system should not leak at a rate of more than_psi per minute with the engine off and the brakes release.
2
13) the air compressor governor controls:
When air is pumped into the air tanks
14) the parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away,
Spring pressure
15) the brake pedal in an air brake system:
Controls the air pressure applied to put on the brakes