How to Solve Rear Wheel Lock-Up?
1 Answers
To address car wheel lock-up, follow these steps: 1. Resolve based on fault codes. 2. Inspect the parking brake switch, brake switch, and ABS indicator light. 3. Check for an open circuit between the PL terminal of the control unit and the ABS indicator light. 4. Verify voltage between the +B terminal of the control unit and the vehicle body. Below is relevant information: 1. Wheel lock-up occurs when the brake (whether disc or drum) clamps the wheel, preventing relative movement between the wheel and the brake. In other words, the wheel stops rotating, causing the car to slide like a brick on the road. 2. Wheel lock-up poses two major hazards. (1) Friction is divided into two types: rolling friction and sliding friction. Rolling friction has a higher coefficient than sliding friction, so braking performance is stronger when the wheel is not locked, with the highest braking efficiency just before lock-up. (2) If the front wheels lock up before the rear wheels, the car loses steering ability. Simply put, if a brick slides on the road, it cannot change its sliding direction. If the rear wheels lock up before the front wheels, it can cause skidding. Thus, lock-up is highly dangerous. 3. ABS (Anti-lock Braking System) is installed to prevent wheel lock-up during braking. In cars without ABS, forcefully pressing the brake pedal rapidly reduces wheel speed. When braking force exceeds the friction between the wheel and the road, the wheel locks up. Fully locked wheels reduce friction between the tire and the road. If the front wheels lock, the driver loses control of the vehicle's direction. If the rear wheels lock, skidding is highly likely.
