TEXAS CDL AIR BRAKES EXAM, PRACTICE

TEXAS CDL AIR BRAKES EXAM, PRACTICE

EXAM AND STUDY GUIDE NEWEST

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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