- Project Time: 1.5 hours
- Tab: $20
- Tools: Micrometer, jack and jack stands, wheel chocks, safety glasses, torque wrench, lug wrench, Sharpie
- Parts Required: Brake rotors
- Performance Gain: Brake performance restored
- Complementary Modification: Replace brake pads
MINI R56 vehicles are equipped with disc brakes at each wheel.
The front discs (or rotors) are larger and usually vented for better cooling. The rear rotors are solid, and the brake caliper handles parking brake features. To withstand the mechanical and thermal stresses of braking, brake rotors are required to be replaced if they are worn thinner than a certain minimum thickness. This minimum thickness is stamped on the edge of the rotor.
This tech article will go over measuring your brake rotors to see if they require replacing. When checking brake rotor thickness, measure the rotor in about 10 different spots. Mark each spot to keep track of where you have measured. If the rotor does not meet minimum thickness specifications, replace it. Replace brake rotors in pairs. If your brake rotor passes thickness but you have a pulsation while using the brakes, replace the brake rotors. Also inspect for overheating, cracks and rust on the braking surface of the rotor.
Brake rotor minimum thickness per R56 modelFront Rear 316 x 22 mm rotor John Cooper Works (JCW) 20.4 mm (0.80 in) n/a 294 x 22 mm rotor Brembo brakes 20.4 mm (0.80 in) n/a 280 x 22 mm rotor ATE brakes 20.4 mm (0.80 in) n/a 280 x 10 mm rotor John Cooper Works (JCW) n/a 8.4 mm (0.33 in) 259 x 10 mm rotor All except JCW n/a 8.4 mm (0.33 in)
Remember that your car may have been serviced before and had parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.
Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you’re working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.
Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.
Nick Czerula, DIY Expert