Which symptom is most directly linked to rotor thickness variation?

Prepare for the Automotive Service Technician Period 1 exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which symptom is most directly linked to rotor thickness variation?

When rotor thickness varies around its circumference, the braking torque changes as the pad contacts the rotor. This makes the braking force rise and fall with each rotation, which is felt most directly as a pulsation in the brake pedal during braking. The other symptoms point to different problems—lock under light braking often involves ABS or grab, no braking response suggests a hydraulic failure, and steering wheel shake at highway speed is typically due to rotor warp or balance issues rather than thickness variation.

When rotor thickness varies around its circumference, the braking torque changes as the pad contacts the rotor. This makes the braking force rise and fall with each rotation, which is felt most directly as a pulsation in the brake pedal during braking. The other symptoms point to different problems—lock under light braking often involves ABS or grab, no braking response suggests a hydraulic failure, and steering wheel shake at highway speed is typically due to rotor warp or balance issues rather than thickness variation.

More practice questions