HEAVY TRUCK BRAKES MICHIGAN
MECHANIC NEWEST EXAM WITH
QUESTIONS AND CORRECT ANSWERS
If gladhand 2 is unhooked or has a severe leak, what will happen
during operation? A. Valve at a will protect the pressure in the dry
tank.
B. Tractor brakes will apply automatically. (not Correct Answer)
C. Valve at c will apply trailer brakes.
D. Valve at b will apply trailer brakes.
During a hard stop, one brake has locked on a trailer with "s" cam
brakes. The service and emergency lines are hooked up properly
and the system is at normal pressure but the brakes will not
release. What is the likely cause of this problem? A. The service
brake chamber diaphragm has split. Correct Answer
B. The cam has rolled over due to too much lining wear.
C. The anti-lock module has burned out at the sending unit. (not
Correct Answer)
D. The chamber spring has rusted and is broken.
, Too much effort is required on the brake pedal to stop a truck with
a vacuum booster. What is the likely cause of this problem? A.
Seized automatic adjusters.
B. Glazed linings
C. A defective modulator valve. (not Correct Answer)
D. Very high engine vacuum. Correct Answer
With the valve pictured below, the operator can: a. Apply the
tractor brakes by spring pressure. (not Correct Answer)
B. Apply the trailer brakes by air pressure.
C. Engage or disengage the parking brakes.
D. Apply the trailer brakes by spring pressure.
It is found that the rubber diaphragm in a master cylinder cover is
swollen to nearly double in size. This could be caused by: a.
Contamination of the brake fluid with engine oil. Correct Answer
B. Accidental mixing with silicone brake fluid.
C. Moisture in the brake fluid.
D. All of the above. (not Correct Answer)
With the engine stopped, a mechanic holds the power brake
pedal in the depressed position. The mechanic the starts the
engine with the pedal still depressed. The pedal sinks slightly.
MECHANIC NEWEST EXAM WITH
QUESTIONS AND CORRECT ANSWERS
If gladhand 2 is unhooked or has a severe leak, what will happen
during operation? A. Valve at a will protect the pressure in the dry
tank.
B. Tractor brakes will apply automatically. (not Correct Answer)
C. Valve at c will apply trailer brakes.
D. Valve at b will apply trailer brakes.
During a hard stop, one brake has locked on a trailer with "s" cam
brakes. The service and emergency lines are hooked up properly
and the system is at normal pressure but the brakes will not
release. What is the likely cause of this problem? A. The service
brake chamber diaphragm has split. Correct Answer
B. The cam has rolled over due to too much lining wear.
C. The anti-lock module has burned out at the sending unit. (not
Correct Answer)
D. The chamber spring has rusted and is broken.
, Too much effort is required on the brake pedal to stop a truck with
a vacuum booster. What is the likely cause of this problem? A.
Seized automatic adjusters.
B. Glazed linings
C. A defective modulator valve. (not Correct Answer)
D. Very high engine vacuum. Correct Answer
With the valve pictured below, the operator can: a. Apply the
tractor brakes by spring pressure. (not Correct Answer)
B. Apply the trailer brakes by air pressure.
C. Engage or disengage the parking brakes.
D. Apply the trailer brakes by spring pressure.
It is found that the rubber diaphragm in a master cylinder cover is
swollen to nearly double in size. This could be caused by: a.
Contamination of the brake fluid with engine oil. Correct Answer
B. Accidental mixing with silicone brake fluid.
C. Moisture in the brake fluid.
D. All of the above. (not Correct Answer)
With the engine stopped, a mechanic holds the power brake
pedal in the depressed position. The mechanic the starts the
engine with the pedal still depressed. The pedal sinks slightly.
