| Trouble | Symptom and possible causes | Remedy |
| Loss of braking | Brake hydraulic system leaking. | Repair or replace. |
| Brake pads worn. | Replace. | |
| Contact surfaces of brake pads contaminated with oil. | Replace. | |
| Brake discs worn. | Replace. | |
| Air in the hydraulic circuit. | Bleed the circuit. | |
| Brakes squeal | Contact surfaces of brake pads vitrified. | Sand brake pad surfaces. |
| Brake pads inverted. | Install brake pads correctly. | |
| Wheel hub bearing damaged. | Replace. | |
| Front or rear wheel spindle loose. | Tighten to the specified torque. | |
| Brake pads worn. | Replace. | |
| Foreign matter suspended in brake fluid. | Change brake fluid. | |
| Return hole of master cylinder obstructed. | Dismantle and clean brake master cylinder. | |
| Brake lever has exceeding travel | Air in the hydraulic circuit. | Bleed the circuit. |
| Brake fluid level low. | Top up to specified level. Bleed the circuit. | |
| Brake fluid does not meet specification. | Change using specified brake fluid. | |
| Brake fluid leakage | Fittings loose. | Tighten to the specified torque. |
| Hoses cracked. | Replace. | |
| Piston and/or body damaged. | Replace piston and/or body. |
Brakes troubleshooting information (Aprilia RS125/3)
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- Information for owner
- Introduction to manual
- Maintenance
- Troubleshooting
- Engine and systems
- Engine repair
- Fuel system
- Cooling and lube system
- Running gear and frame
- Frame and hinged elements
- Front suspension and handlebar
- Rear suspension
- Brake system
- Wheels and tires
- Electric equipment
- Equipment and devices
- Starting and charging system