ASE G1 Auto Maintenance and Light RepairMaintenance and Light RepairMedium
A client complains that their vehicle pulls to one side when the brakes are applied. Which of the following is the MOST likely cause?
- AA seized brake caliper piston on one wheel.
- BWorn spark plugs.
- CAn underinflated tire on the opposite side of the pull.
- DLow power steering fluid.
Show answer & explanationAnswer & explanation
Correct answer: A. A seized brake caliper piston on one wheel.
A seized brake caliper piston prevents the brake pad from applying even pressure, causing uneven braking force. If one side brakes harder than the other, the vehicle will pull towards the side with more braking force.
Why the other options are wrong
- B. Worn spark plugs affect engine performance and misfires, not braking characteristics.
- C. An underinflated tire can cause a pull while driving, but it's less likely to be the primary cause of a pull specifically *when the brakes are applied* compared to a braking system component failure.
- D. Low power steering fluid affects steering effort, not the vehicle's tendency to pull under braking.
Brake Pull Diagnosis
Identifying the root cause of a vehicle pulling to one side specifically during braking, often indicative of an imbalance in braking force.
- Uneven braking force is the primary cause.
- Common culprits include seized calipers, contaminated pads, or restricted brake lines.
- Requires careful inspection of each wheel's braking components.
Memory trick: Brakes pulling? Check for uneven stopping power.