Air Brakes 6

If you must make an emergency stop, you should brake so you:

• Use the full power of the brakes to lock them up

• Rely on the trolley handbrake before applying full force to the brake pedal

• Pull out your parking and emergency knobs to lock up the brakes

• Can steer and so your vehicle stays in a straight line

If your brakes are out of adjustment, you will not have good _____ braking.

• Service

• Emergency

• Parking

• All of the answers are correct

If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:

• Balance the service brake system when you are parked

• Release the spring emergency/parking brakes to move a short distance for safety

• Stay parked twice as long without using up service air pressure

• Swap your service and emergency air line glad hand

In an air brake system, the system protection valves do not include:

• Quick release valves

• Parking valves

• Relay valves

• Exhaust valves

In order to engage the parking brakes under normal conditions, the driver should:

• Be sure air brake system is fully pressurized

• Turn off the engine

• Pushing the yellow diamond-shape knob

• Let the air out of the air brake system

It is generally accepted that too much heat caused by your brakes too often can cause:

• Brake linings to split up

• Brakes to fade or fail

• Modulating control valve to wear out

• Governor to completely fail

It is not safe or legal to drive a vehicle that has brake linings that are less than

• 1/8 inch

• 1/3 inch

• 1/4 inch

• 1/2 inch

Large airbrake vehicles have spring brakes, which are:

• A. Parking brakes

• B. Emergency brakes

• C. Service breaks

• Both A and B are correct

Large air brake vehicles must have:

• An air pressure gauge which shows the pressure available in the emergency brake tank

• An air pressure gauge which shows the pressure available for braking

• An air use gauge which shows the air used by the brake chambers for braking

• All answers are correct

Slack adjusters:

• Work automatically, so the driver does not have to check for brake adjustment

• Should be adjusted once a month

• Should travel at least 2 inches from where the pushrod is attached

• Can be adjusted either manually or automatically, depending on the type