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
16) some air brake system have an alcohol evaporator. What may happen if you don’t keep the unit filed with alcohol?
Ice may form in the air storage tanks and cause the brakes to fail
17) the brake system that applies and releases the brakes when the driver uses the brake pedal is the _brake system.
Service
18) before driving a truck or bus with a dual air brake system, the pressure in each system should be at least_psi.
100
19) your truck or bus has a dual air system. If a low air pressure warning comes on for only one system. What should you do?
Stop right away and safely park, continue only after the system is fixed
20) how should you check that your service brakes are working properly?
Walt for normal air pressure, release the parking brake, move the truck forward slowly, and apply the brakes firmly using the brake pedal
