Diesel Tech Brakes ASE Practice Test 2
Exam Questions and Answers 100%
Solved | Rated A+
Technician A says the same electronic control unit (ECU) operates the
antilock braking systems (ABS) on the tractor and the trailer. Technician B
says that if replacement tires are a different size from the original tires, the
wheel speed sensor signals are affected. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ✔✔B. B only
A truck with air brakes and a suspended (fire-mounted) pedal has a low
pedal. Which of the following could be the cause?
A. The brakes are adjusted too tight
B. No air pressure in the primary brake circuit
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,C. The brake pedal pushrod is too long
D. The parking brake is broken - ✔✔B. No air pressure in the primary brake
circuit
A truck with hydraulic disc brakes has dragging brakes. Technician A says
the calipers may be sticking. Technician B says the master cylinder may be
passing fluid. Who id correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ✔✔A. A only
Which of the following could cause one brake on a truck to wear faster than
the others?
A. A restricted service brake hose
B. A restricted air line between the supply and primary tank
C. Low air pressure in the service tanks
D. Governor cut-out pressure too high - ✔✔A. A restricted service brake
hose
2
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
, The front brakes on a truck are being checked. The drum rolls freely
backward, but hangs and stops when rotated forward by hand. Technician
A says the problem could be a broken slack adjuster. Technician B says
the problem could be an incorrectly adjusted hand brake valve. Who is
correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ✔✔D. Neither A nor B
On a tractor-trailer combination with air brakes, the parking brake on the
tractor will not release, but the trailer brakes work correctly. Which of the
following is the most likely cause?
A. Shorted brake light switch
B. Stuck parking brake relay valve
C. Stuck service brake relay valve
D. A hand valve slightly stuck on - ✔✔B. Stuck parking brake relay valve
3
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
Exam Questions and Answers 100%
Solved | Rated A+
Technician A says the same electronic control unit (ECU) operates the
antilock braking systems (ABS) on the tractor and the trailer. Technician B
says that if replacement tires are a different size from the original tires, the
wheel speed sensor signals are affected. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ✔✔B. B only
A truck with air brakes and a suspended (fire-mounted) pedal has a low
pedal. Which of the following could be the cause?
A. The brakes are adjusted too tight
B. No air pressure in the primary brake circuit
1
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
,C. The brake pedal pushrod is too long
D. The parking brake is broken - ✔✔B. No air pressure in the primary brake
circuit
A truck with hydraulic disc brakes has dragging brakes. Technician A says
the calipers may be sticking. Technician B says the master cylinder may be
passing fluid. Who id correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ✔✔A. A only
Which of the following could cause one brake on a truck to wear faster than
the others?
A. A restricted service brake hose
B. A restricted air line between the supply and primary tank
C. Low air pressure in the service tanks
D. Governor cut-out pressure too high - ✔✔A. A restricted service brake
hose
2
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
, The front brakes on a truck are being checked. The drum rolls freely
backward, but hangs and stops when rotated forward by hand. Technician
A says the problem could be a broken slack adjuster. Technician B says
the problem could be an incorrectly adjusted hand brake valve. Who is
correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ✔✔D. Neither A nor B
On a tractor-trailer combination with air brakes, the parking brake on the
tractor will not release, but the trailer brakes work correctly. Which of the
following is the most likely cause?
A. Shorted brake light switch
B. Stuck parking brake relay valve
C. Stuck service brake relay valve
D. A hand valve slightly stuck on - ✔✔B. Stuck parking brake relay valve
3
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
