- Fluid level too low.
- Fluid contaminated with air.
- Fluid too old.
- The brake fluid has the wrong viscosity.
2. Faulty master cylinder:
-Internal leak in the master cylinder.
-The piston in the master cylinder is seized or damaged.
3. Faulty brake booster:
- Vacuum leak in the brake booster.
- Diaphragm in the brake booster is damaged or torn.
4. Faulty brake caliper:
- Caliper piston is seized or damaged.
- Caliper slide pins are seized or damaged.
- Caliper return spring is broken.
5. Faulty brake hose:
- Brake hose is blocked or kinked.
- The inner liner of the brake hose is delaminating.
6. Faulty wheel bearing:
- Wheel bearing is damaged or seized, creating friction and preventing the wheel from turning.
7. ABS module malfunction:
- Faulty ABS module or wheel speed sensor.
- Damaged wiring harness.
8. Faulty brake light switch:
- The brake light switch is stuck in the "on" position.
9. Vehicle overloading:
- Excessive weight in the vehicle can cause the brakes to overheat and lock.
10. Aggressive driving:
- Heavy braking or sudden stops can cause the brakes to lock.
