By Core Brake Parts Tech Team — Circleville, OH warehouse
Rotor replacement is the brake pad job with two extra steps added: unbolting the caliper bracket from the knuckle, and separating the old rotor from the hub. Anyone working out how to replace brake rotors on an Audi Q5 should also plan for one Q5-specific wrinkle, which is the electronic parking brake at the rear on many model years. That system has to be put into service mode before the rear caliper pistons will retract.
Do the work one axle at a time, replace rotors in pairs, and fit new pads whenever you fit new rotors.
What you need on the bench
- Floor jack and jack stands. A jack alone is never enough to hold a vehicle you are working under.
- Lug wrench, socket set, and a breaker bar for the caliper bracket bolts
- C-clamp or piston tool for the front, plus whatever your rear caliper design requires
- Brake cleaner
- High-temperature silicone caliper grease
- Anti-seize for the hub face
- Penetrating oil
- Torque wrench and the service manual for torque figures
- A scan tool or the in-car procedure to place the electronic parking brake in service mode, if your Q5 has one
How to replace brake rotors on an Audi Q5
- If you are doing the rear axle, put the electronic parking brake into service mode first, following the correct procedure for your model year. Retracting the piston by force against an engaged motor damages the caliper.
- Crack the lug nuts loose with the wheel still on the ground.
- Jack the corner up, lower it onto jack stands, and pull the wheel off.
- Unbolt the caliper and hang it from a hook so the brake hose supports no weight.
- Unbolt the caliper bracket from the knuckle, using a breaker bar if the bolts are tight.
- Remove the small rotor retaining screw if fitted, then pull the rotor. Rust is normally the only thing still holding it.
- Clean the hub face back to bare metal, then apply a light film of anti-seize away from the braking surface.
- Clean the shipping oil off the new rotor with brake cleaner.
- Fit the rotor, then reinstall the bracket and caliper at service-manual torque.
- Refit the wheel, lower the vehicle, and torque the lugs in a star pattern.
- Take the parking brake out of service mode, then pump the pedal until it feels firm and confirm the parking brake holds before driving.
When the rotor will not come off
Rear rotors on a crossover often rust to the hub harder than the fronts, because the rear brakes run cooler and never bake the corrosion off. Soak the joint with penetrating oil, then tap steadily around the rotor hat rather than pounding one spot. If the rotor has the two threaded jacking holes that many designs provide, thread bolts in and tighten them evenly to press the rotor off cleanly. That method is far kinder to the hub and the wheel bearing than brute force.
Audi Q5 specifics
Expect rotors noticeably larger and heavier than a compact car's, so plan your grip before the rotor releases. The electronic parking brake is the main thing that separates a Q5 rear brake job from an older mechanical setup, and it is the step that most often sends a DIY job to a shop halfway through. Sort out the service mode procedure before you take anything apart.
Confirm rotor diameter for your exact year and trim before ordering. A model line can carry more than one brake package, and a rotor that is close but not correct will not fit inside the caliper bracket.
Bedding in the new brakes
New pads and rotors have to be bedded in before hard driving so the friction material lays down an even transfer layer. Use the sequence the pad manufacturer specifies, usually a set of firm but not emergency stops with cooling intervals in between. Do not hold the brake pedal down while stopped at a light immediately after bedding, since the hot pad can imprint material onto one spot of the rotor.
Is this a job worth doing at home?
Front rotors on a Q5 are a straightforward mechanical job for someone with stands, a breaker bar, and a torque wrench. The rear is a step up because of the parking brake electronics. If you have no way to command service mode, book the rear axle at a shop and do the front yourself, or do both at once. Buying rotors and pads as a matched axle set keeps the parts consistent, and we carry kits built around common Q5 rotor sizes.
Frequently asked questions
Do I need a scan tool for Audi Q5 rear brakes?
On model years fitted with the electronic parking brake, you need some way to put the system into service mode, whether that is a scan tool or a documented in-car procedure. Forcing the piston back against a live actuator can wreck the caliper.
How often do Q5 rotors need replacing?
There is no fixed mileage. Rotors are replaced when they are below minimum thickness, badly scored, cracked, or have developed thickness variation that you feel as a pulsating pedal. Driving style, climate, and how much stop-and-go traffic the vehicle sees change the interval considerably.
Can I reuse my old pads with new rotors?
No. Old pads are worn into the shape of the old rotor and will not make even contact with a fresh surface. Fit new pads with new rotors every time.
Why is anti-seize on the hub face so important?
Rust or debris trapped between the hub and the rotor hat is a leading cause of pedal pulsation months after a rotor change. Cleaning the hub to bare metal and adding a thin protective film keeps the rotor sitting flat and makes the next removal far easier.
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