HEAVY TRUCK BRAKES MICHIGAN
MECHANIC STUDY GUIDE FINAL PAPER
2026 FULL QUESTIONS WITH CORRECT
ANSWERS GRADED A+
⩥ Why drain water from the compressed air tanks? Answer: Water can
freeze in cold weather and cause brake failure.
⩥ The air brakes system for a straight truck or bus should not leak at a
rate of more than ___ psi per minute with the engine off & the brakes
released Answer: 2
⩥ To make an emergency stop with air brakes, using the stab braking
method, you should: Answer: Press on the brake pedal as hard as you
can, release the brakes when the wheels locked, put on the brakes again
when the wheels start rolling.
⩥ You should know that your brakes are fading when: Answer: You have
to push harder on the brake pedal to control your speed on a downgrade.
⩥ If the air compressor should develop a leak, what keeps the air in the
tanks? Answer: The one way check valve
, ⩥ To check the brake slack on S-cam brakes you should park on
Answer: Park on level ground, chock the wheels, and release the parking
brakes
⩥ The application pressure gauge shows how much air pressure you:
Answer: When you are applying to the brakes
⩥ The spring brakes used on the chambers in a straight truck will bring
you to a stop when air pressure drops below ___ psi Answer: 20
⩥ The safety valve is set to automatically reduce pressure at ___ psi
Answer: 150
⩥ Your truck has a dual air system and one of the system loses its
pressure, what will happen Answer: Either the front or back brake will
not be fully operational.
⩥ If your truck or bus has dual parking control valves, you can use
pressure from a separate tank to: Answer: Release the spring
emergency/parking brakes to move a short distance.
⩥ If your truck has a properly functioning dual air brake system and
minimum size air tanks. The air pressure should build from 85 to 100
within ____ seconds Answer: 45
MECHANIC STUDY GUIDE FINAL PAPER
2026 FULL QUESTIONS WITH CORRECT
ANSWERS GRADED A+
⩥ Why drain water from the compressed air tanks? Answer: Water can
freeze in cold weather and cause brake failure.
⩥ The air brakes system for a straight truck or bus should not leak at a
rate of more than ___ psi per minute with the engine off & the brakes
released Answer: 2
⩥ To make an emergency stop with air brakes, using the stab braking
method, you should: Answer: Press on the brake pedal as hard as you
can, release the brakes when the wheels locked, put on the brakes again
when the wheels start rolling.
⩥ You should know that your brakes are fading when: Answer: You have
to push harder on the brake pedal to control your speed on a downgrade.
⩥ If the air compressor should develop a leak, what keeps the air in the
tanks? Answer: The one way check valve
, ⩥ To check the brake slack on S-cam brakes you should park on
Answer: Park on level ground, chock the wheels, and release the parking
brakes
⩥ The application pressure gauge shows how much air pressure you:
Answer: When you are applying to the brakes
⩥ The spring brakes used on the chambers in a straight truck will bring
you to a stop when air pressure drops below ___ psi Answer: 20
⩥ The safety valve is set to automatically reduce pressure at ___ psi
Answer: 150
⩥ Your truck has a dual air system and one of the system loses its
pressure, what will happen Answer: Either the front or back brake will
not be fully operational.
⩥ If your truck or bus has dual parking control valves, you can use
pressure from a separate tank to: Answer: Release the spring
emergency/parking brakes to move a short distance.
⩥ If your truck has a properly functioning dual air brake system and
minimum size air tanks. The air pressure should build from 85 to 100
within ____ seconds Answer: 45
