Brake discs

When to replace it

• When the thickness is close to the minimum stamped on the disc or specified by the manufacturer
• If it has cracks, deep grooves or rust that will not go away
• In pairs on the same axle, normally with new brake pads

Signs of wear

• Vibration in the steering wheel or pedal when braking
• Noises or rubbing
• A pronounced lip on the outer edge of the disc
• Less effective braking

What you need

• Jack and jack stands
• Wrenches and torque wrench
• Caliper gauge or micrometer
• Brake cleaner

General steps

These steps are for guidance. Always follow your car manual and its torque values.

1. Park on level ground, switch off the engine, apply the handbrake if it does not interfere and chock the wheels that stay on the ground. Loosen the wheel bolts, lift the car at the support points given in the manual, place it on jack stands on firm ground and remove the wheel. Never work with the car supported only by the jack.
2. Remove the caliper and its bracket, and hang them without straining the brake hose.
3. Remove the disc retaining screw, if it has one, and take off the disc.
4. Clean the hub thoroughly. A little rust can make the new disc vibrate.
5. Use brake cleaner to remove the protective coating from the new disc, fit it and secure it with its screw, if it has one. Retract the piston slowly, making sure the fluid does not overflow in the reservoir, and refit the bracket, pads and caliper.
6. Tighten the bracket and caliper to the manufacturer's torque. Refit the wheel, lower the car and tighten the wheel bolts to torque. Before moving the car, press the pedal until it feels firm, check the brake fluid level and bed in the brakes with gentle braking.

Guide for your model

For instructions on your specific car, Autodoc Club publishes manuals by make and model.

Open the Autodoc Club manuals

External site, not related to OBDpedia.

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional.