Suspension, Steering, Braking and Control Systems

Question 0

The following readings are obtained after adjusting the rear to eliminate the thrust angle during a four-wheel alignment. Allowing for road crown, what adjustments will provide the best handling and tire wear?
Angle Specs Left Side Right Side
Caster 2 to 3 degrees 2 deg 2 1/4 deg
Camber -1/4 - +1/4 0 deg +1/4
a. Adjust the right side caster to 0 and the left side camber to +1/4
b. Adjust the left side caster to 2 1/4 and right side camber to 0
c. Leave the right side camber and adjust the left side camber to +1/4
d. Leave the left side camber and adjust the right side camber to +1/4

Answer 0

b. Adjust the left side caster to 2 1/4 and right side camber to 0

Question 1

A customer complains of a steering wheel that is not centred. The technician notices the thrust angle is +0.7 degrees. There is wear on the outside of the right rear tire. What causes this condition?

a. There are bent components in the right rear suspension.
b. The front wheel alignment is not adjusted to specifications.
c. There are bent components in the left rear suspension.
d. The right rear wheel is adjust with too much negative camber.

Answer 1

a. There are bent components in the right rear suspension.

Question 2

A tech is pressure testing a reciprocating ball type gear box power steering system. The results are as follows. What should be done to correct the problem?
Free run pressure 75 psi
Maximum output pressure 1350 psi
Left turn pressure 850 psi
Right turn pressure 1300 psi
a. Replace the pressure relief valve because it is sticking.
b. Replace the pump because the pumping element is worn.
c. Replace the steering gear because the ball nut seal is worn.
d. Replace the steering gear because the rotary valve seals are worn.

Answer 2

d. Replace the steering gear because the rotary valve seals are worn.

Question 3

A customer complains of a “bouncing” tire with vibration at 30-60km. The car bounces 5 or 6 times before coming to rest during a suspension bounce test. What is the problem?

a. A weak or broken spring
b. Weak shock absorbers
c. A cracked shock mount
d. Dynamic imbalance in the tires

Answer 3

b. Weak shock absorbers

Question 4

Which of the following statements is true for frame and suspension repair?

a. Longitudinal torsion bars are adjusted on the opposite side of the vehicle on which they are anchored.
b. Steering linkage adjustment can compensate for minor frame sway.
c. Transverse torsion bars are adjusted on the same side of the vehicle on which they are anchored.
d. Steering linkage adjustment can compensate for minor frame sag.

Answer 4

b. Steering linkage adjustment can compensate for minor frame sway.

Question 5

What would be the cause of a cupping wear pattern on a tire?

a. Worn shock absorbers and static imbalance
b. Worn shock absorbers and dynamic imbalance
c. Incorrect alignment and frame damage
d. Incorrect alignment and tire faults

Answer 5

a. Worn shock absorbers and static imbalance

Question 6

What is the cause of a brake pedal pulsation that is most noticeable at slow speeds and that is accompanied by a shudder in the steering wheel?

a. Lack of parallelism in the front rotors
b. Out-of-round rear drums
c. Excessive caster
d. Dynamic wheel imbalance

Answer 6

a. Lack of parallelism in the front rotors

Question 7

The customer complains that the brake pedal holds on the first application if force is maintained on the pedal, but goes lower with each successive gentle application, gradually going to the floor at a stop light. What is the problem?

a. The wheel cylinders are leaking.
b. The booster is not working.
c. The master cylinder is leaking internally.
d. The booster valving is faulty.

Answer 7

c. The master cylinder is leaking internally.

Question 8

A customer complains of intermittent shaking and pedal pulsation under hard braking on a vehicle equipped with ABS. The pedal is high and hard most of the time. The vehicle stops smoothly and predictably under light braking. What is the problem?

a. The quick take-up valve is sticking closed.
b. The ABS brakes are operating normally.
c. The brake booster has a small tear in the diaphragm.
d. There is excessive parallelism in the rotors.

Answer 8

b. The ABS brakes are operating normally.

Question 9

A tech has serviced a complete brake system equipped with ABS, but the pedal feels spongy. How is this problem corrected?

a. The rear brake shoes need to be adjusted closer to the drums.
b. The brake system must be bled while operating the hydraulic control unit using a scan tool.
c. The new brake linings must by burnished with several firm brake applications.
d. The brake system must be bled in order - rear brakes first, then front brakes, then top up the reservoir and bleed the master cylinder.

Answer 9

b. The brake system must be bled while operating the hydraulic control unit using a scan tool.

Question 10

Specifications and measurements of brake drums are shown below. Each drum has severe scoring. What service is recommended?
Spec. Left Right
Diameter max. 11.030” 11.032” 11.026”
a. Machine the drums and re-measure.
b. Machine the drums and re-install.
c. Replace the right drum and machine the left.
d. Replace both drums.

Answer 10

d. Replace both drums

Question 11

A customer complains of high pedal effort. A hissing sound while braking seems to be coming from around the pedal. What is the cause?

a. The brake booster vacuum valve is leaking.
b. The vacuum booster diaphragm is torn.
c. The brake booster atmospheric valve is leaking.
d. The vacuum check valve on the booster is faulty.

Answer 11

a. The brake booster vacuum valve is leaking

Question 12

A front tire shows wear on both edges and the sidewalls are scuffed. Small rubber dust like particles are found inside the tire. What is the cause?

a. The tire has been run at low pressures.
b. The tire was overloaded.
c. The tire was overinflated.
d. The tire was loaded during hard cornering.

Answer 12

a. The tire has been run at low pressures.

Question 13

What steps are followed when a loaded ball joint has 0.130” vertical movement?

a. Joint movement is acceptable - check the wheel alignment.
b. Replace the joint, then perform a wheel alignment.
c. Grease the joint, then retest.
d. Test drive for unpredictable steering, then examine the wear indicator.

Answer 13

b. Replace the joint, then perform a wheel alignment.

Question 14

A power rack and pinion steering system is stiff and hard to turn. When it is first driven, the fluid is dull grey. What is the correction?

a. Flush the system, then replace the fluid.
b. Replace the rack, then flush the lines and cooler.
c. Flush the lines and cooler, then replace the rack and the pump.
d. Replace the pump, then flush the system.

Answer 14

c. Flush the lines and cooler, then replace the rack and the pump.

Question 15

What is the correct order of adjustments when rebuilding a reciprocating ball power steering box?

a. Worm-bearing preload, then sector shaft end play
b. Sector shaft end play, then worm-bearing preload
c. Worm-bearing preload, then over-centre adjustment
d. Over-centre adjustment, then worm-bearing preload

Answer 15

c. Worm-bearing preload, the over-centre adjustment

Question 16

A tech is repairing a trailing arm suspension that uses coil-over-shocks. What must be done in order to replace the shocks?

a. Support the rear axle, then replace the shocks.
b. Remove and replace one shock, then remove and replace the other.
c. Separate the lower ball joint, then replace the shock.
d. Remove the springs, then the shocks.

Answer 16

a. Support the rear axle, then replace the shocks.

Question 17

The auto-levelling feature of a vehicle suspension has stopped working. Which procedure will identify the problem?

a. Check the fuses, and then test the pump.
b. Replace the level sensor, then test the air bags for leaks.
c. Bypass the level sensor, and then check if the pump runs.
d. Install a scan tool and then check for communication among the control modules.

Answer 17

d. Install a scan tool and then check for communication among the control modules.

Question 18

How does a tech test a vacuum operated brake booster?

a. Disconnect the vacuum source to the brake booster, then test drive the unit.
b. A scan tool may be used to cycle the system, then test drive while using the scan tool function.
c. Measure the vacuum supply, and then measure the vacuum available at the booster.
d. Pump the brake pedal several times to exhaust the reserve vacuum, then hold the pedal down while starting the engine.

Answer 18

d. Pump the brake pedal several times to exhaust the reserve vacuum, then hold the pedal down while starting the engine…?

Question 19

When replacing master cylinder, what must be done in order to ensure the cylinder functions properly?

a. Transfer the proportioning valves, then install the master cylinder.
b. Install the master cylinder, bleed the quick take up valve, then fill the reservoir.
c. Bench bleed the master cylinder, then install and fill the reservoir.
d. Install the master cylinder, then adjust the brakes.

Answer 19

c. Bench bleed the master cylinder, then install and fill the reservoir.

Question 20

A tech is remove brake calipers in order to replace the disc brake pads. Which of the following practices must be observed to protect the ABS hydraulic control unit?

a. Push the piston back, remove the caliper, then remove the disc brake pads.
b. Open the bleeder, push the piston back, close the bleeder, then remove the caliper and the disc pads.
c. Remove the caliper bracket, pump the brake pedal several times to retract the piston, then remove the disc pads.
d. Remove the brake pad retaining pins, then slide the pads out without retracting the piston.

Answer 20

b. Open the bleeder, push the piston back, close the bleeder, then remove the caliper and the disc pads.

Question 21

A tech is attempting to remove rear brake drums. The drums will turn and move but will not come off. What must the tech do?

a. Spray chemical penetrant around the axle flange, then hammer on the drum to break it loose.
b. Heat the axle to loosen any rust on the flange, then hammer on the drum to brake it loose.
c. Cut the brake shoe hold-down pins, then pry the drum off the backing plate.
d. Loosen the adjusters to retract the shoes, then slip the drums off.

Answer 21

d. Loosen the adjusters to retract the shoes, then slip the drums off.

Question 22

What must a tech look for during the road test following the installation of new brake linings?

a. A firm pedal and straight steering wheel.
b. A hard pedal and a slight pull to the right.
c. Smell and noise complaints.
d. A hard pedal and straight line stop.

Answer 22

d. A hard pedal and straight line stop.

Question 23

What procedure must be followed when installing a tire and wheel assembly?

a. Tighten the lug nuts in a specific pattern, then torque them to specs in the same pattern.
b. Install the rim to the hub while observing the directional indicators.
c. The valve stem must be aligned with the indicated stud, then the on-car balance re-checked.
d. Install the balance ring behind the wheel, then match mount it to improve balance.

Answer 23

a. Tighten the lug nuts in a specific pattern, then torque them to specs in the same pattern.