TEXAS CDL AIR BRAKES EXAM, PRACTICE
EXAM AND STUDY GUIDE NEWEST 2024
ACTUAL EXAM 250 QUESTIONS AND CORRECT
DETAILED ANSWERS WITH (VERIFIED
ANSWERS) |ALREADY GRADED A
TEXAS CDL AIR BRAKES EXAM
If the air compressor should develop a leak, what keeps the air in the tanks? - ANSWER- The one way check valve.
When driving down a long steep hill you should: - ANSWER-
Release the brake when you are 5 mph below you safe speed.
The brake system that applies and releases the brakes when a
driver uses the brake pedal is the: - ANSWER- Service brake
system.
The most common type of foundation brakes found on heavy
vehicles is the: - ANSWER- S-can drum
Vehicles with air brakes must have: - ANSWER- An air
pressure gauge to show the pressure available for braking. 1 / 4
Air brakes should be drained... - ANSWER- 1. At the end of each working day. 2. To keep sludge from clogging system valves.
- Manually when automatic devices fail.
Fanning air brakes... - ANSWER- Decreases the air pressure.
If you air compressor stops working... - ANSWER- You'll still have pressure left in the tanks.
The governor allows the air to star pumping aging when it reaches the cut in level or around... - ANSWER- 100 psi
You should not use the parking brakes... - ANSWER- When the brakes are hot.
The brake drums or discs... - ANSWER- Must not have cracks longer than half the width of the friction area.
Slack adjusters... - ANSWER- Can be adjusted manually or automatically.
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To determine if slack adjusters need adjustment... - ANSWER- Release big the service and parking brakes.
An air tank is equipped with a drain valve to remove... - ANSWER- Water and oil.
The governor stops pumping air when it reaches the cut out level, or around... - ANSWER- 125 psi
The air compressor governor controls... - ANSWER- When the air compressor pumps air into the storage tanks.
A dual air brake system... - ANSWER- Has two brake systems and one set of controls.
An emergency brake... - ANSWER- Is required on commercial vehicles, must be held by mechanical force, could be activated by loss of air pressure.
To check the slack adjusters on s-can brakes, you should ... - ANSWER- Wear gloves and pull hard on each adjuster.
To test low pressure warning... - ANSWER- 1. Shut of engine. 3 / 4
- Turn on electrical power.
- Step on and off brake pedal to reduce to 60 psi.
With dual air systems, the air pressure should build... - ANSWER- From 85 to 100 psi in 45 seconds n
A fully charged air system typically has ____ psi. - ANSWER- 125
To test air leakage rate you should... - ANSWER- Turn off engine and release the service brake.
When testing air leakage rates for combination vehicles(before applying the brake pedal), air brake systems should not lose air faster than... - ANSWER- 3 psi per minute.
To check the air compressor governor cut in and cut out pressures... - ANSWER- 1. Run the engine at a fast idle.
- Step in and off the brake to reduce tank pressure.
- Monitor the air pressure gauge.
Brake drums: - ANSWER- 1. Are bolted to the wheels.
- Are located at each end of the vehicles axles.
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