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Diesel Tech Brakes ASE Practice Test 2
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Diesel Tech Brakes ASE Practice Test 2
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Diesel Tech Brakes ASE Practice Test2
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
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
-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
-A technician is testing a hydraulic brake booster. With the engine off, the
brake pedal depresses 1.5 inches, then the engine is started and the brake
pedal falls another inch. Technician A says this indicates a faulty master
cylinder. Technician B says this indicates a faulty brake booster. 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 straight truck equipped with air brakes, the primary tank pressure
gauge falls to zero when the wet air tank is drained. Technician A says the
one-way check valve may be faulty. Technician B says the foot valve may be
faulty. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - -A. A only
-What is the LEAST LIKELY cause of a trailer ABS failure?
A. An incorrect wheel speed sensor adjustment
B. Corroded or damaged wiring connectors
C. A failed ABS electronic control unit
D. An open in the supply lead from the tractor - -C. A failed ABS electronic
control unit
-The secondary tank pressure gauge falls to zero when the primary air tank
is drained on a straight truck equipped with an air brake. technician A says
the double-check valve may be faulty. Technician B says the single-check
valve may be faulty. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - -A. A only
-A technician is testing a hydraulic brake system. With the engine off, the
brake pedal depresses 4.5 inches (11.4 cm). Which of the following could be
the cause?
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