Download SOS Brake & Braking System Exam Questions with 100% Correct Answers and more Exams Mechanics in PDF only on Docsity!
SOS BRAKE & BRAKING SYSTEM
EXAM QUESTIONS WITH 100% CORRECT ANSWERS
"The brake warning light on the dash stays on all the time, which of the following could be the cause of
the problem? - CORRECT ANSWER A problem in the hydraulic circuit"
"The front brakes of a car equipped with disc brakes in the front and drum brakes in the rear, grab quickly as light pressure is applied to the brake pedal, which of the following could be the cause of the
problem? - CORRECT ANSWER Defective metering valve"
"A car's wheels severely vibrate when the brakes are applied, which of the following is the LEAST likely
source of he problem? - CORRECT ANSWER The master cylinder"
"The brakes of a car squeal each time they are applied, which of the following is the LEAST likely source
of the noise? - CORRECT ANSWER Glazed brake pads"
"The brake lights on a car do not light when the brake pedal is depressed, which of the following is the
LEAST likely cause of the problem? - CORRECT ANSWER A burned out bulb."
"What does a load sensing proportioning valve do? - CORRECT ANSWER It increases the hydraulic
pressure during braking at the rear wheel cylinders when the vehicle is loaded"
"Most anit-lock brake systems require the removal of the pressure modulator fuse when: - CORRECT
ANSWER A "space-saver" spare tire is being used"
"When checking a newly turned drum before putting it back on, you notice a thread-like grooves in the
braking surface. Why are the grooves there? - CORRECT ANSWER The lathe was not adjusted properly
when the drum was turned" "During a brake overhaul, you notice that the brake fluid seems to be very dirty and dark in color. What
should you do? - CORRECT ANSWER flush the system before the new parts are installed"
"In order to bleed the system on a vehicle equipped with power brakes: - CORRECT ANSWER None of
the above"
"Which of the following could be a symptom of over-torqued lug nuts? - CORRECT ANSWER A brake
pedal pulsation during braking." "Which of the following describes the proper sequence to bleed brake lines on most rear wheel drive
vehicles: - CORRECT ANSWER RR, LR, RF, LF"
"In disc brake caliper assemblies, the "square cut seal" is usually located: - CORRECT ANSWER In the
caliper piston bore"
"Sliding caliper disc brake pads are kept in adjustment by the - CORRECT ANSWER Square cut piston
seal" "When the brakes are applied on a car with disc-drum brakes, a vibration or pulsating movement is felt.
What can cause this problem? - CORRECT ANSWER A rotor thickness variation"
"While test driving a car, the mechanic finds that the right front brake "grabs". The most likely cause of
this problem is: - CORRECT ANSWER Brake fluid or grease on the brake linings."
"Which of the following would most likely cause dragging brakes? - CORRECT ANSWER A defective
vehicle load sensor" "With the car standing still, you can hear a squeaking noise when applying the brake pedal slowly. What
could cause this noise? - CORRECT ANSWER Dry backing plate contact surfaces."
"There is a scraping sound coming from one rear brake. The sound stops when the brakes are applied.
What is the likely cause of the problem? - CORRECT ANSWER A broken shoe hold-down spring or pin"
"If a drum brake self-adjuster seizes up, the likely result will be: - CORRECT ANSWER A low pedal"
"Which of the following can be used to check for rotor thickness variation? - CORRECT ANSWER Dial
indicator" "On a vehicle with a disc/drum brake system, the rear wheels lock up under hard braking. The most
likely cause is: - CORRECT ANSWER A defective proportioning valve"
"After putting a bearing race in a hub, you notice that the new race is loose and can spin in the hub.
What should you do? - CORRECT ANSWER Replace the hub"
"When adjusting disc-drum brakes, you should: - CORRECT ANSWER Adjust the rear brakes after
releasing the parking brakes"
"What type of rotor surface provides the best braking with new pads? - CORRECT ANSWER A smooth,
flat surface"
"You are rebuilding a master cylinder. What should you use to lubricate the internal parts? - CORRECT
ANSWER Brake fluid"
"When adjusting the front wheel bearings of a rear-wheel-drive car: Technician A tightens the adjusting nut until there is no tire wobble. Technician B tightens the adjusting nut to the appropriate torque, then
tightens it slightly more to line the castellations of locking nut with the cotter pin hole. Who is right? -
CORRECT ANSWER Neither A or B"
"Technician A says it is normal for brake shoes to have excessive wear in the center of the shoe. Technician B says if the lining is less than 1/32 of an inch above the rivets, it should be replaced. Who is
right? - CORRECT ANSWER B only"
"Technician A bench bleeds the master cylinder before installing it on the car. Technician B depresses the pistons and allows gravity to push air out of the master cylinder before connecting the brake lines to
the master cylinder. Who is right? - CORRECT ANSWER A only"
"Which of the following is the LEAST likely cause of one brake dragging? - CORRECT ANSWER A
corroded master cylinder bore"
“In a single anchor bendix drum type rear brake - CORRECT ANSWER the secondary lining is longer
than the primary"
"Compared to the secondary shoe lining areas of drum brakes, the primary shoe lining area is: -
CORRECT ANSWER smaller and goes toward the front of the car"
"When performing a caliper overhaul, what would you use to remove the pistons from the calipers? -
CORRECT ANSWER Compressed air"
"A cracked or torn vacuum diaphragm in a power booster would likely cause: - CORRECT ANSWER
Hard pedal with very high effort required" "During a road test, you find that when normal breaking pressure is applied the pedal slowly goes to the
floor. What is the likely cause of this problem? - CORRECT ANSWER A leaking master cylinder primary
piston seal." "A rattle is a single piston disc brake assembly which goes away when the brakes are applied is most
likely a result of: - CORRECT ANSWER Loose pads in the caliper"
"A car has a spongy pedal. Which of the following could be the cause? - CORRECT ANSWER Air in the
system." "Technician A says a stuck caliper piston can cause the car to pull during braking. Technician B says a
broken return spring in a rear drum brake can cause the car to pull during braking. Who is right? -
CORRECT ANSWER Both A & B"
"Which of the following is not correct in the procedure for preparing a brake rotor for matching? -
CORRECT ANSWER Use a brake micrometer to measure the diameter"
"A car equipped with a vacuum assist power brake system reads an abnormal amount of pedal effort to
stop the car, which of the following could be the cause? - CORRECT ANSWER A plugged booster air
breather" "While diagnosing a braking problem on a car equipped with a vacuum power booster: Technician A says excessive pedal travel can be caused by a leaking check valve. Technician B says excessive pedal travel
can e caused by an improperly adjusted master cylinder push rod. Who is right? - CORRECT ANSWER B
only" "Technician A uses a silencer belt only on brake rotors that have heavy heat checks while matching
them. Technician B always machines a brake rotor to the minimum thickness allowed. Who is right? -
CORRECT ANSWER Neither A or B"
"All of the following, EXCEPT one could cause the parking brakes to fail or not hold: - CORRECT
ANSWER Air in the system"
"Technician A says the accumulator in an ABS system is used to store hydraulic fluid to provide residual pressure for power assisted braking. Technician B says the booster pump in an ABS system provides
pressurized hydraulic fluid for the ABS system. Who is right? - CORRECT ANSWER Both A & B"
"While road testing a car with an ABS system, Technician A says during heavy braking, several clicks should be heard from the rear wheels as they try to lock up. Technician B says a spongy pedal during
braking is normal. Who is right? - CORRECT ANSWER A only"
"Technician A lubricates the pivot points and cables of the parking brake system whenever it is services. Technician B pulls he parking brake lever to its stop, then adjusts the cable so that the rear wheels are
locked. Who is right? - CORRECT ANSWER A only"
"Technician A says the dust boot of a brake cailiper should be removed and a large dull screwdriver used to pry the piston out of the bore. Technician B says air pressure should be injected into the bleeder
screw's bore to force the piston out of the brake caliper. Who is right? - CORRECT ANSWER B only"
"Which of the following would be the LEAST likely cause for an intermittent problem in an ABS system? -
CORRECT ANSWER Open wheel sensor circuit"
"Technician A says when you are installing a new set of brake shoes a small amount of brake grease should be put on the heel and toe of the shoe. Technician B says when you are installing a new set of brake shoes, grease should be put on all areas of the backing place where there is metal-to-metal
contact. Who is right? - CORRECT ANSWER B only"
"A mechanic finds gear lube inside both rear brake drums on a rear wheel drive vehicle. What is the
most likely cause of this problem? - CORRECT ANSWER A plugged axle vent"
"Which of the following is not a necessary precaution to follow when performing brake repairs on an
ABS equipped vehicle? - CORRECT ANSWER Always remove the electronic brake control module fuse
before adjusting or replacing a wheel speed sensor"
"Which of the following is true when inspecting wheel speed sensors? - CORRECT ANSWER You should
measure the air gap between the sensor and the reluctor wheel teeth"
"Which of the following is true about most properly functioning anti-lock brake systems? - CORRECT
ANSWER The brakes may lock up at speeds less than 10 miles per hour"
"Which of the following would be the result of an inoperative ABS pump/motor assembly: - CORRECT
ANSWER Conventional braking should still be available"
"Which of the following is true about bleeding brake lines on most ABS equipped vehicles? - CORRECT
ANSWER Most ABS brake lines can be bled like a convention ( non ABS) system (Caution must be taken
because of the extreme pressure)"
"Which of the following describes the proper way to depressurized an ABS system? - CORRECT
ANSWER Pump the brake pedal at least 25 times (or more, depending on the manufacturer's
recommendation) with the ignition off."
"What information might be found on a brake drum to help a mechanic? - CORRECT ANSWER The
maximum diameter dimension" "Which of the following is a quick way to determine whether the master cylinder is bad? There are no
external leaks in the system. - CORRECT ANSWER Pump up the brake pedal, then hold it firm. If the
pedal slowly drops to the floor, the master cylinder is bad." "Technician A says that excessive pedal travel can be caused by low brake fluid levels; Technician B says
that the excessive pedal travel can be caused by air in the hydraulic system? Who is right? - CORRECT
ANSWER Both A and B"
"Technician A says a bad brake hose may cause a fluid leak. Technician B says a defective bake hose may
cause a restriction in the hydraulic circuit. Who is right? - CORRECT ANSWER Both A & B"
"Technician A uses a pressure tester to check the operation of the accumulator, hydraulic pump, and controls of an ABS system during diagnosis. Technician B checks an ABS system by checking the codes in
the control computers memory. Who is right? - CORRECT ANSWER Both A & B"
"Technician A says that brake drums should never be matched beyond the maximum diameter designated on the drum. Technician B says that a brake drum with more than 0.005 inch out-of-
roundness should be machined true on a lathe. Who is right? - CORRECT ANSWER Both A & B"
