2026 Free California DMV Class A Air Brakes Endorsement Test 2 (25 Questions And Complete Answers)
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When a brake pedal is pressed and the S-cam is turned, the S-cam:
1. Presses the brake shoes against the inside of the brake drum.
2. Tightens the brake drum onto the axle.
3. Presses the brake lining against the wheel.
1. Presses the brake shoes against the inside of the brake drum.
2. Tightens the brake drum onto the axle.
3. Presses the brake lining against the wheel.
Presses the brake shoes against the inside of the brake drum.
During a static leakage test, what is the maximum leakage rate that is safe for a double combination vehicle?
1. 3 psi in one minute.
2. 6 psi in one minute.
3. 8 psi in one minute.
1. 3 psi in one minute.
2. 6 psi in one minute.
3. 8 psi in one minute.
3 psi in one minute.
A visual low pressure warning signal should activate before air pressure drops to a level between:
1. 55 and 75 psi.
2. 35 and 50 psi.
3. 75 and 100 psi.
1. 55 and 75 psi.
2. 35 and 50 psi.
3. 75 and 100 psi.
55 and 75 psi.
During an applied leakage test, the maximum leakage rate for a triple combination vehicle is:
1. 10 psi in a minute.
2. 8 psi in a minute.
3. 6 psi in a minute.
4. 4 psi in a minute.
1. 10 psi in a minute.
2. 8 psi in a minute.
3. 6 psi in a minute.
4. 4 psi in a minute.
6 psi in a minute.
The ____ between an air compressor and reservoir tank prevents air from escaping if the air compressor has a leak.
1. Slack adjuster
2. One-way check valve
3. Tractor protection valve
1. Slack adjuster
2. One-way check valve
3. Tractor protection valve
One-way check valve
If the low pressure warning signal activates while you are driving, you should:
1. Continue driving normally.
2. Exit the road and park as soon as safely possible.
3. Stop where you are and park.
1. Continue driving normally.
2. Exit the road and park as soon as safely possible.
3. Stop where you are and park.
Exit the road and park as soon as safely possible.
Once the air tanks are at an air pressure level of 125 psi, the air compressor governor will:
1. Stop the compressor from pumping air.
2. Release air from the tanks.
3. Begin pumping air into the tanks.
1. Stop the compressor from pumping air.
2. Release air from the tanks.
3. Begin pumping air into the tanks.
Stop the compressor from pumping air.
When parking, you should not use the parking brake if
1. The brakes are very hot.
2. The brakes are very cold.
3. There is snow on the ground.
1. The brakes are very hot.
2. The brakes are very cold.
3. There is snow on the ground.
The brakes are very hot.
Vehicles equipped with Anti-Lock Braking Systems (ABS) have ____ malfunction lamps to indicate when the ABS is not working.
1. Green
2. Blue
3. Yellow
1. Green
2. Blue
3. Yellow
Yellow
Brake linings should be:
1. Loose.
2. Free of oil.
3. Soft
1. Loose.
2. Free of oil.
3. Soft
Free of oil.
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