ASE A4 Suspension and SteeringSteering System Diagnosis and RepairEasy
A customer reports that their vehicle's power steering system is making a high-pitched squealing noise, especially when turning the steering wheel to its full lock. Upon inspection, the technician observes a loose and glazed power steering pump belt. What is the MOST likely cause of the noise and reduced assist?
- AA loose or worn power steering pump drive belt.
- BA clogged power steering fluid filter.
- CAir in the power steering system.
- DA worn power steering pump.
Show answer & explanationAnswer & explanation
Correct answer: A. A loose or worn power steering pump drive belt.
A loose or worn power steering pump drive belt will slip under load, causing a squealing noise and reducing the pump's efficiency, leading to decreased power assist.
Why the other options are wrong
- B. A clogged filter would typically cause groaning and increased effort, but less likely a squeal.
- C. Air in the system usually causes a whining or gurgling noise, not a squeal.
- D. A worn pump might groan or whine, but a squeal is more indicative of belt slip.
Power Steering Belt Slip
When the power steering pump's drive belt is loose or worn, it can slip on the pulley, producing noise and reducing the pump's output.
- Causes a high-pitched squealing noise.
- Results in reduced power steering assist.
- Often accompanied by a glazed appearance on the belt.
Memory trick: Belt slip screams, 'Tighten me!'