NEW
Font size
WorksheetsBrake Diagnosis worksheet
Total questions: 50
Worksheet time: 25mins
What is the purpose of verifying the customer's complaint as mentioned in the lesson objectives for brake diagnosis?
To determine the serviceability of a drum or rotor
To establish pedal height, pedal freeplay, and reserve distance
To convey the importance of verifying the customer's complaint
To explain the cause of rotor parallelism
Which tool is used to measure hub runout and rotor runout according to the lesson objectives?
Brake drum micrometer
On-car brake lathe
Dial indicator
Vernier caliper
What is the objective of using a micrometer or vernier caliper in brake diagnosis?
To establish pedal height, pedal freeplay, and reserve distance
To measure hub runout and rotor runout
To determine brake drum diameter and serviceability
To measure rotor parallelism
What is the purpose of using a brake drum micrometer as per the lesson objectives?
To phase-match a rotor and hub for minimum rotor runout
To determine brake drum diameter and serviceability
To turn a rotor using the on-car brake lathe
To explain the cause of rotor parallelism
When diagnosing brake problems, what is the first step according to the plan of action provided in the learning material?
Repair the problem.
Isolate the cause.
Verify the customer's complaint.
Identify the symptoms.
What should you do if the customer's complaint cannot be verified?
Proceed with the repair based on your expertise.
Ignore the complaint as it may not be genuine.
Do some preliminary checks before taking the car out on the road.
Attempt to find the source of the problem or any other improper things to bring to the customer's attention.
If a customer's car had a previous repair for a similar symptom, what advantage does this give you?
It allows you to charge more for the service.
It gives you an advantage in your diagnosis.
It means you can ignore the current complaint.
It ensures the car will not have the same problem again.
Before taking the customer's car out for a test drive, what should you ensure?
That the customer has paid for the service.
That the car has been cleaned and washed.
That the car is safe and the pedal does not go to the floor.
That you have the customer's permission to drive the car.
What should be checked for leaks during preliminary checks before bringing a vehicle in for service?
Engine oil level and tire pressure
Brake backing plate, flexible brake hoses, connections, brake tubing, auxiliary valves, master cylinder
Air filter and battery terminals
Radiator fluid and windshield wiper fluid
What is adjusted to establish the brake pedal position?
The brake lining
The master cylinder
The push rod
The brake hoses
What is a possible effect of air in the brake line on the brake pedal reserve distance?
The pedal will feel firmer and more responsive
The pedal will not move
The pedal will need to go further to the floor and feel spongy
The pedal will automatically adjust to the correct position
If the brake pedal is hard and the braking is inefficient, what should be suspected?
The brake pads need to be replaced
The brake fluid is contaminated
The booster or its vacuum source
The automatic adjusters are working correctly
When inspecting brake pads, what might comparing the wear side to side indicate?
The quality of the brake pad material
The alignment of the wheels
A potential issue with the brake system operation
The age of the brake pads
What should be inspected as they may indirectly cause noise or pull when the brakes are applied?
Engine components
Suspension areas
Electrical systems
Exhaust system
What may excessive wheel and tire run-out indicate when felt on brake application?
A problem with the transmission
A need for an oil change
Vibration due to specific run-out specification
A malfunctioning air conditioning system
At what speeds might vibration from wheel and tire run-out be felt according to the text?
At 20 mph and at 100 mph
At 55 mph and at 60 mph
At 40 mph and at 25 mph
At 10 mph and at 30 mph
When vibration is most noticeable in the steering wheel, which components should be checked first?
Parking brake and brake assemblies
Wheel alignment and suspension bushings
Front brakes, wheel and tire condition
Disc rotor for parallelism
What should be measured to check disc rotor for parallelism?
The disc thickness at six points around the circumference
The disc thickness at eight points around the circumference, about 10 mm from the outside edge
The disc thickness at four points around the circumference
The disc thickness at ten points around the circumference
What is the maximum allowable difference in drum measurement before machining is required?
0.010"
0.006"
0.008"
0.004"
When a vehicle pulls consistently in one direction, what is usually the problem?
Steering wheel misalignment
Brake system
Tire rotation
Engine performance
What should be inspected first when there is a condition of greater amount of braking on one side?
The condition of the brake pads
The surface condition of the brake drum or disc surface
The brake fluid level
The alignment of the wheels
What should be done when lining that is soaked with brake fluid or gear oil is found?
Clean the lining with a cloth
Replace the lining and repair the source of the leak
Adjust the brake caliper
Refill the brake fluid or gear oil
What is a common cause of brake noise?
Low brake fluid
Friction between the pads and drum or rotor
Loose wheel nuts
Worn steering components
How can glazed lining be remedied?
By tightening the brake caliper
By replacing or cleaning using emery cloth
By adding brake fluid
By adjusting the wheel alignment
What is the purpose of anti-squeal shims in a brake assembly?
To increase braking efficiency
To hold the brake pad rigidly
To dampen the vibration when pads contact the disc
To clean the rotor surface
What can be reused if they are in good condition during the assembly of brake pads?
Caliper pistons
Anti-squeal springs and support plates
Brake pad rest
Shim grease
What should be done if brake noise occurs only on the first few brake applications?
Replace the brake pads
Inspect for glazed lining
Check for corrosion on the disc rotors
Lubricate the caliper piston
What is NOT affected by groan or creep-groan when adjusting the pedal effort?
The noise level
The braking system
The braking performance
The color of the brake pads
Brake vibration is a symptom that occurs during braking and is usually accompanied by what?
A visual alert
Sound
A warning light
An electrical fault
At what speeds does brake vibration typically occur when it is transmitted to the suspension system, steering wheel, instrument panel, and brake pedal?
Only at high speeds
Only at low speeds
At both high and low speeds
At medium speeds
If the vibration causes the steering wheel to oscillate side to side, what is likely the cause?
The rear brake assemblies
The suspension system
The front brake assemblies
The instrument panel
What can be used to isolate the brake vibration by applying the parking brake at the speed at which the vibration occurs?
The rear parking brake
The front brake assemblies
The steering wheel
The suspension system
When measuring the rotor for parallelism, how far from the outer edge should the measurements be taken?
5 mm
10 mm
15 mm
20 mm
What is used to measure the rotor at eight different places around the diameter?
A caliper
A ruler
A micrometer
A tape measure
What is the maximum allowable thickness variation for the rotor before it needs to be resurfaced or replaced?
0.001"
0.002"
0.003"
0.008"
What does thickness variation in the rotor cause?
Decrease of hydraulic pressure to the brake pads
The rotor to become unbalanced
The thickest part of the rotor to push the piston back into the caliper cylinder
The brake pads to wear unevenly
What are the two conditions that cause thickness variation in rotors?
Rotor run-out and excessive rust or corrosion on rotor surface.
Rotor misalignment and brake pad wear.
Brake fluid leakage and rotor run-out.
Excessive rust or corrosion on rotor surface and brake fluid contamination.
What is the most significant cause of rotor thickness variation?
Excessive rust or corrosion on rotor surface.
Rotor run-out.
Brake pad wear.
Poor mounting of the disc rotor and axle hub.
What causes excessive thickness variation when a vehicle with rusted rotors is driven?
The rusted areas wear at a different rate than the non-corroded areas.
The brake pads wear out more quickly.
The rotor becomes more balanced.
The vehicle's alignment is corrected.
When mounting machined rotors or replacing new rotors, what should be checked in addition to the axle bearing condition?
The weather conditions
The torque specification of the lug nuts
The paint quality of the rotor
The air pressure in the tires
What is the maximum allowable run-out when mounting a rotor?
0.010" (0.25 mm)
0.002" (0.05 mm)
0.020" (0.50 mm)
0.100" (2.5 mm)
What is the purpose of measuring the rotor thickness?
To ensure it is lighter than the minimum thickness
To ensure it is greater than the minimum thickness
To ensure it is the same color as the minimum thickness
To ensure it is at the maximum thickness
What is the importance of using the specified torque and a star sequence when tightening wheel lug nuts?
It ensures the wheels are aligned correctly.
It prevents damage to the wheel bearings.
It prevents distortion of the rotor and avoids a comeback.
It makes the wheels easier to remove later.
What can be the consequence of using an impact wrench to tighten lug nuts?
It can lead to improved fuel efficiency.
It can enhance the braking performance.
It can cause uneven torque and distort the rotor.
It can make the vehicle more aerodynamic.
What should be done following the repair to ensure customer satisfaction?
The vehicle should be cleaned and detailed.
A road test should be conducted to ensure the repair concern has been eliminated.
The customer should be offered a discount on future services.
The vehicle's oil should be changed.
What should be done after locating the lowest point of indicator travel when measuring rotor run-out?
Tighten the lug nuts
Mark a stud on the rotor
Zero the indicator
Measure the lug nut torque
What is the specification for maximum allowable thickness variation in brake rotors?
0.003 inches
0.005 inches
0.001 inches
0.010 inches
Which of the following symptoms would likely be experienced with excessive thickness variation in brake rotors?
Squeaking noise
Steering wheel vibration
Reduced fuel efficiency
Increased stopping distance
List two causes of rotor thickness variation.
Improper installation and overheating
Wear and tear and low brake fluid
Corrosion and high-speed driving
Potholes and tire imbalance
What is the correct repair procedure for rotor thickness variation?
Replacing the brake pads
Resurfacing or replacing the rotor
Bleeding the brake system
Tightening the wheel lug nuts
