2013-2018 Audi RS6 Front vs Rear Brakes: What Wears First and What to Replace

By Core Brake Parts Tech Team — Circleville, OH warehouse

On a 2013-2018 Audi RS6 (C7), the front brakes wear first, and usually by a wide margin. The front axle carries the big 390 mm iron rotors and six-piston calipers because it does most of the stopping, so expect to replace front pads and rotors more often than the rears. The rears are smaller 356 mm discs that last longer but still need regular inspection.

One note before we start: the C7 RS6 was built only as an Avant wagon and was never sold new in the U.S. Most owners here are driving an imported car or the RS7 sister model, which shares the same iron brake hardware. Everything below applies to both, as long as the car has the standard iron brakes and not the optional carbon-ceramic package.

How the C7 RS6 Brake System Is Laid Out

The C7 RS models use internally vented front discs 390 mm across and 36 mm thick, gripped by six-piston fixed calipers. At the rear, the C7 A6, A7, S6, S7 and RS7 family uses a 356 mm iron rotor, listed by aftermarket rotor makers at 356 mm by 22 mm, and the RS6 shares that platform setup.

The optional carbon-ceramic package is a different system entirely. It uses a larger front disc and a different caliper, and none of the iron rotors or pads in this article fit it. Check before you order: carbon-ceramic discs have a matte, speckled gray face instead of shiny machined iron, and the calipers are usually painted and branded differently.

Why the Fronts Wear First on an RS6

Every car shifts weight forward when it brakes, which loads the front tires and lets them do more of the work. On a heavy wagon with a 552-horsepower twin-turbo V8, that effect is large. The front brakes absorb most of the heat on every stop, so the front pads burn down faster and the front rotors see more heat cycling.

The stability control system also plays a role. Modern ABS and stability systems can apply individual brakes to control wheel slip, and aggressive launches or spirited driving make that happen more often. Even so, the front axle nearly always needs service well before the rear.

A realistic plan is to inspect both axles every time the wheels come off or the tires are rotated. Do not assume the rear is fine because the front was just done; rear pads are smaller to start with, and a sticking rear caliper or slide can wear them unexpectedly fast.

Symptoms and How to Tell Which End Needs Work

• Brake pad warning light: The car uses electronic pad wear sensors. Note which wheel the sensor sits on, then measure the pads on both axles yourself instead of trusting a single sensor.
• Steering wheel shake under braking: Usually a front rotor issue - uneven pad deposits or thickness variation on the 390 mm discs.
• Pulsation felt through the seat or pedal only: Can point to the rear rotors, especially on a car that sits for long periods and builds up rust.
• Grinding or scraping: Pad material is gone. Stop driving and inspect immediately; metal-on-metal contact ruins rotors quickly.
• A lip on the rotor edge: A pronounced ridge at the outer edge means the rotor has worn down. Measure it with a micrometer.

Measuring is the only reliable test. A new front rotor is 36 mm thick, and aftermarket specs for the C7 RS front list a 34 mm minimum. That is only 2 mm of usable wear, which is why many RS owners replace front rotors with every pad set or every other pad set. For the rear, read the minimum thickness stamped on your rotor and compare it to your micrometer reading.

What to Replace, and in What Order

Front brake job

Plan on front pads plus front rotors. Because the wear window on the 390 mm discs is so narrow, resurfacing rarely leaves a rotor above the minimum. Replace rotors in pairs, fit new pad hardware, and check the wear sensor. If you want an upgrade, a two-piece floating rotor is an option: the GiroDisc slotted front rotors for the 2013-2018 RS6 and RS7 bolt to the factory iron-brake calipers, use 390 mm by 36 mm rings with a 34 mm minimum, and let you replace only the iron ring later while keeping the aluminum hat.

Browse brake pads and brake rotors for other options, and always confirm your car has iron brakes before ordering.

Rear brake job

Rear pads and 356 mm rear rotors typically last longer than the fronts, depending on how the car is driven. Because the rear caliper also handles the parking brake, the piston usually cannot simply be pushed back; cars with an electronic parking brake generally need a scan tool to put the rear calipers into service mode first. Skipping that step can damage the parking brake actuator.

Replace at the same time

• Pad wear sensors, if the old sensor was triggered or damaged.
• Pad clips and slide hardware - see brake hardware kits.
• Brake fluid, if it is due by age. Use the fluid specified on the reservoir cap or in the owner's manual.
• Caliper bolts where the factory service information calls for them to be replaced.

Pad Choice and Rotor Care on a Heavy Performance Car

The RS6 is a large wagon with a lot of power, so pad choice matters. Street-focused pads with good cold bite and low dust suit most owners. Track-oriented pads handle heat better but can be noisy and harder on rotors in daily driving. Whatever you choose, it must match the factory pad shape and depth for the iron-brake caliper.

One practical warning from a rotor maker: some pad compounds leave heavy deposits on the rotor face, which drivers feel as pulsation that seems like a warped rotor. Bedding new pads properly - a series of firm stops from moderate speed without coming to a complete halt, then a cool-down drive - lays down an even transfer layer and prevents most of that.

How Hard Is the Job?

The front brake job is straightforward mechanically, but the parts are heavy: an aftermarket two-piece front rotor assembly weighs about 28 pounds. Use proper lifting points, support the caliper instead of letting it hang on the hose, and torque all caliper and wheel fasteners to the values in the factory service manual.

The rear job is more involved because of the parking brake. If you do not have a scan tool that can open the rear calipers for service, have a shop handle the rears. Either way, plan on a test drive and a pad bedding procedure before normal use.

Frequently Asked Questions

Do RS7 brake parts fit a C7 RS6?

For cars with the standard iron brakes, the C7 RS6 and RS7 share the 390 mm front rotor, and front rotors like the GiroDisc set are listed for both. Always confirm the part listing covers your exact car, and remember carbon-ceramic cars use different parts.

How often do the front brakes need replacing compared to the rear?

Expect the fronts to wear out first, often noticeably sooner than the rears. Driving style changes this a lot, so measure both axles at each inspection.

Can I resurface the front rotors on my RS6?

Usually not. The front rotors start at 36 mm and aftermarket specs list 34 mm as the minimum, so there is very little material to machine off. Replacement is the normal fix.

Do I need a scan tool to change the rear pads?

On cars with an electronic parking brake, the rear calipers generally need to be put into service mode with a scan tool before the pistons can be retracted.

Will iron rotors fit a car with carbon-ceramic brakes?

No. The carbon-ceramic system uses different disc sizes and calipers, and iron-brake rotors and pads are not interchangeable with it.

Sources

1. GiroDisc - Audi C7 RS6, RS7 Front Rotors A1-190 - 390 mm by 36 mm front rotor, 34 mm minimum, 28.3 lb assembly, iron brakes only
2. Alcon Kits - C7 RS6/RS7 front rotors - front rotor size and 34 mm minimum, same pad depth as OEM
3. JH Motorsports - C7 rear rotors - RS7 356 mm by 22 mm rear rotor, pad deposit caution
4. Alcon Kits - C7 356 mm rear rotors - C7 platform 356 mm by 22 mm rear rotor dimensions
5. Motor Authority - The Audi RS 6 is now 20 years old - C7 RS6 Avant-only, not sold in the U.S., 552 hp twin-turbo V8