DFFT Brakes and Braking Systems 2

Question 1

A brake pedal slowly sinks to the floor when held under constant pressure. What is this condition called?

Accepted Answer

Brake pedal creep caused by a faulty master cylinder

Answer

Brake fade from overheated rotors

Answer

Hydraulic lock caused by a seized caliper

Answer

Vapor lock in the brake lines

Question 2

During a DFFT inspection, you find one brake rotor has a blue discoloration. What does this indicate?

Accepted Answer

The rotor has been subjected to excessive heat

Answer

The rotor has surface rust from prolonged storage

Answer

The rotor has been machined incorrectly

Answer

The rotor is made from a different alloy

Question 3

A vehicle's parking brake fails to hold the car on a moderate hill. What is the most likely cause on a rear-drum brake vehicle?

Accepted Answer

Stretched or corroded parking brake cable

Answer

Low brake fluid in the reservoir

Answer

Worn front disc brake pads

Answer

A faulty ABS wheel speed sensor

Question 4

After a brake job, a customer returns complaining the brake pedal is very hard to press. What was likely the fault in the repair?

Accepted Answer

The brake booster vacuum hose was not reconnected

Answer

The brake fluid was overfilled in the reservoir

Answer

New pads were installed without lubricating the slides

Answer

The calipers were not properly bled after installation

Question 5

A customer reports the brake pedal vibrates when stopping at highway speed. What is the most likely cause?

Accepted Answer

Warped or uneven brake rotors

Answer

Air trapped in the brake caliper

Answer

Worn brake pad friction material

Answer

A cracked brake drum on the rear axle

Question 6

You notice brake fluid is leaking from behind a front wheel. What is the most probable source?

Accepted Answer

A leaking brake caliper piston seal

Answer

A cracked brake rotor

Answer

A loose wheel speed sensor

Answer

A worn wheel bearing seal