BLOCK F: Steering, Suspension, Braking and Cooling system. Flashcards
When bleeding the brakes on a car with a metering valve using a pressure bleeder, Which of the following must be performed?
a. The metering valve must be held closed.
b. The metering valve should be left alone.
c. The metering valve should be held open.
d. The proportioning valve should be held closed until the front brakes are bled.
c. The metering valve should be held open.
What tool should be used to check disc brake rotor runout?
a. Straight edge and feeler gauge.
b. Outside micrometer.
c. Inside micrometer.
d. Dial indicator.
d. Dial indicator.
When measuring TIR ( Total Indicated Runout) on a rotor, a positive reading of 1mm and a negative reading of 1.5 mm is recorded through one rotation. What is the TIR?
a. 0.5mm
b. 1.0mm
c. 1.5 mm
d. 2.5mm
d. 2.5 mm
What tool is required to measure disc brake parallelism? a. Straight edge and feeler gauge. b. Outside micrometer. c. Inside micrometer. Dial indicator
b. Outside micrometer
When a brake pedal is applied with steady pressure, the pedal slowly travels to the floor. There is no evidence of external leakage. Which of the following would be the most likely cause of the problem?
a. Defective residual check valve.
b. Plugged inlet port.
c. Leaking master cylinder primary cup.
d. Leaking master cylinder secondary cup.
c. Leaking master cylinder primary cup.
Which of the following conditions would be the most likely to cause brake fade in a drum brake system?
a. A single panic stop.
b. Wet brake.
c. Braking in extreme cold.
d. Repeated braking in long down hill gradient.
d. Repeated braking in long down hill gradient.
A road test reveals that excessive brake-pedal effort is required to stop a vehicle. Which of the following is the most likely cause?
a. Worn friction facing.
b. Air in hydraulic circuit.
c. Water in hydraulic circuit.
d. Power-assist malfunction.
d. Power-assist malfunction.
Which of the following would be a correct method of depressurizing an ABS system prior to servicing a brake caliper assembly?
a. Bleed down engine vacuum.
b. Depress brake pedal 40 times with engine off.
c. Depress brake pedal 40 times with engine on.
d. Crack open master cylinder line nuts.
b. Depress brake pedal 40 times with engine off.
During a road test of a vehicle equipped with disc brakes, the brake pedal pulsates when the brakes are applied. Which of the following could accounts for this complaint?
a. Plugged master cylinder compensation port.
b. Aerated hydraulic fluid.
c. Moisture/contaminated fluid.
d. A warped rotor
d. A warped rotor
Which of the following would identify the output of an ABS wheel speed sensor?
a. Measuring the supply voltage.
b. Spinning the wheel and measuring the
V-AC.
c. Spinning the wheel and measuring the
V-DC.
d. Measuring the resistance across the sensor terminals.
b. Spinning the wheel and measuring the
V-AC.
When machining disc brake rotors, how much material should be removed on the final cut?
a. 0.002” [ 0.051mm]
b. 0.008” [0.20mm]
c. 0.012” [ 0.30mm]
d. 0.020” [0.50mm]
a. 0.002” [ 0.051mm]
In a heavy-duty vehicle air brake system using double chamber spring brakes, which force is used to actuate the emergency brakes?
a. Air pressure.
b. Spring pressure.
c. Hydraulic pressure.
d. Mechanical lever.
b. Spring pressure.
Which of the following driving condition will electronic traction control most likely prevent?
a. Hard acceleration.
b. Skidding.
c. Panic braking.
d. Differential spinout.
d. Differential spinout.
A front axle tire shows evidence of feathering wear biased towards the outside of the tire. Which of the following is the more likely cause?
a. Excessive toe-out.
b. Excessive toe-in.
c. Improper drag link adjustment.
d. Steering rack not centered.
b. Excessive toe-in.
When a tire is under-inflated, where will the wear be most noticeable?
a. Sidewall.
b. center of the tire.
c. outer edges of the tire.
d. Inside edges of the tire
c. outer edges of the tire
What is the maximum pressure an automobile tire can be inflated to when attempting to seat a bead into the rim?
a. 35 psi [240kPa]
b. 50 psi [345 kPa]
c. 80 psi [552 kPa]
d. 100 psi [690kPa]
b. 50 psi [345 kPa]
Which type of wheel balance provides the most precision and for this reason would be used on high performance applications?
a. Bench-type static balancer.
b. Bench-type dynamic balancer.
c. On-the-car spin balancer.
d. off-the-car computer balancer
c. On-the-car spin balancer.
When installing a tire on a rim, which of the following steps will ensure airflow through the valve is greatest so that the bead is properly seated?
a. Lubricating the valve core with rubber lube.
b. Removing the valve core during inflation.
c. Setting the air compressor regulator to its highest setting.
d. Igniting an ether charge within the tire.
b. Removing the valve core during inflation
In a typical rack-and-pinion steering gear, where is the most wear experienced?
a. Pinion.
b. Center of the rack.
c. Extremities of rack.
d. Racks are designed to wear evenly.
b. Center of the rack.
Why should a steering rack preload adjustment NOT be performed when the rack is known to be worn over high point[center]?
a. Manufacturers advise against performing preload adjustments.
b. Most wear takes place on the rack extremities.
c. It will result in high point bindings.
d. It will result in binding on turns.
d. It will result in binding on turns.
Of the 5 alignment angles, which 3 are normally adjustable on a modern automobile? " no longer a valid question but for test purposes"
a. Caster, Camber and Toe.
b. Turning radius, SAI [steering angle
inclination] and toe.
c. Toe, turning radius and camber.
d. SAI, toe and castera. Caster, Camber and Toe.
When performing a 4-wheel computer alignment, which of the following should be true?
a. Toe is only adjusted on the front wheel.
b. Alignment gauges are installed only on
the front wheels.
c. Steering wheel should be in the straight
ahead position.
d. Thrust angle is calculated by front-wheel
orientation only
c. Steering wheel should be in the straight
ahead position.
Which of the following could illuminate the red brake-warning light?
a. Power assist malfunction.
b. Maladjusted rear drum brakes.
c. Worn brake shoes.
d. Broken parking brake pedal return spring.
d. Broken parking brake pedal return spring.
[The brake warning light is most likely illuminated by a broken parking brake pedal return spring that does not allow the signal switch to open.]
No fluid is seen squirting from the primary compensation port in the master cylinder reservoir on brake application. Which of the following would be the most likely cause?
a. Brake pedal push-rod adjustment.
b. Defective secondary cup seal.
c. Air in the hydraulic circuit.
d. Defective master cylinder cup seal.
a. Brake pedal push-rod adjustment.
A vehicle with a front disc, rear drum brakes system , skids and nosedives when the brakes are first applied. Which of the following is the most likely cause of this condition?
a. A pressure differential switch.
b. The metering valve.
c. The proportioning valve.
d. Aerated brake fluid.
b. The metering valve.
The metering valve delays hydraulic pressure to the front brakes and gives the system a chance to overcome rear drum spring tension. The metering valve helps to achieve balanced braking
A rear-wheel-drive sport utility vehicle has a rear brake lock-up condition when the vehicle is lightly loaded. Which of the following would be the most likely cause of this problem?
a. Defective pressure differential switch.
b. Defective metering valve.
c. seized proportioning valve.
d. Air in the hydraulic circuit.
c. seized proportioning valve.
Many rear-wheel-drive sport utility vehicles and trucks used a load-sensing proportioning valve to modulate brake pressures in proportion to load.
if the valve seizes in the loaded position and the load is removed, that excess brake pressure will be applied to the rear brakes and result in brake lock-up.
