Which component prevents the wheels from locking during hard braking?

• Proportioning valve

• Master cylinder

• Anti-lock braking system (ABS)

• Brake booster

What is the purpose of a vacuum brake booster?

• To reduce pedal effort

• To increase braking force to the rear wheels

• To balance hydraulic pressure between wheels

• To assist with ABS operation

A customer complains that their brake warning light stays on. Which of the following is the MOST likely cause?

• A faulty wheel speed sensor

• Low brake fluid level

• A seized caliper piston

• Worn brake pads

What is the main function of the master cylinder?

• To amplify braking force

• To convert mechanical force into hydraulic pressure

• To reduce hydraulic pressure in the system

• To distribute brake force evenly to all wheels

What can cause brake fluid contamination?

• Mixing DOT 3 and DOT 5 brake fluids

• Excessive heat buildup

• A leak in the hydraulic lines

• All of the above

A technician is bleeding the brakes on a vehicle with ABS. What must be done FIRST?

• Turn off the ABS module

• Pump the brake pedal rapidly

• Follow the manufacturer’s bleeding procedure

• Disconnect the battery

What would cause a pulsation in the brake pedal during braking?

• Warped rotors

• Air in the brake lines

A customer complains of a grinding noise when braking. What is the MOST likely cause?

• Worn brake pads

• Air in the brake lines

• Low brake fluid

• A leaking master cylinder

When inspecting drum brakes, what should be done if the brake shoes show uneven wear?

• Replace the brake shoes only

• Inspect the drum and hardware for damage

• Bleed the brake system

• Adjust the brake shoes

Which of the following is a symptom of a faulty proportioning valve?

• Rear-wheel lockup during hard braking

• A soft brake pedal

• Brake drag on one wheel

• Uneven pad wear