DFFT Brakes and Braking Systems

Question 1

A vehicle pulls to one side when the brakes are applied. What is the most likely cause?

Accepted Answer

Uneven brake pad wear or a seized caliper on one side

Answer

Uneven braking force caused by a seized caliper or uneven pad wear causes the vehicle to pull toward the side with more braking force.

Question 2

A customer reports a spongy brake pedal that goes nearly to the floor. What is the most likely diagnosis?

Accepted Answer

Air in the hydraulic brake lines

Answer

Air is compressible, so air trapped in the hydraulic lines causes a spongy, low pedal feel instead of firm hydraulic resistance.

Question 3

Brake fade occurs during repeated heavy braking. What is the primary cause of this condition?

Accepted Answer

Overheated brake pads losing friction coefficient

Answer

Excessive heat causes brake pad material to vaporize or glaze, dramatically reducing the friction needed to slow the vehicle.

Question 4

A grinding noise is heard when the brakes are applied. What does this indicate?

Accepted Answer

Brake pads worn down to the metal backing plate

Answer

When pad friction material is completely worn away, the metal backing plate contacts the rotor directly, causing a grinding metal-on-metal noise.

Question 5

A vehicle with ABS has a warning light on and the pedal pulses abnormally during normal stops. What should be checked first?

Accepted Answer

Wheel speed sensors and their wiring harness

Answer

A faulty or damaged wheel speed sensor sends incorrect signals to the ABS control module, triggering the warning light and causing improper ABS activation.

DFFT - Driver Fault Finding Test Practice Test

DFFT - Driver Fault Finding Test Practice Test

DFFT Brakes and Braking Systems