Brake Discs: Checking For Surface Rust And Operating Brakes To Clean If Necessary - Audi R8 2015 Maintenance Manual

Audi R8 2015 ➤
Maintenance - Edition 03.2016
– Insert metal ruler through opening in brake caliper until it
makes contact with brake disc.
– Using scale on metal ruler, read off brake pad wear value -a-
at outer edge of backplate.
– Repeat procedure on opposite side of vehicle.
– If brake pad thickness has reached wear limit (see table of test
values and procedure guidelines
pads ⇒ Rep. gr. 46 ; Brake system; Removing and installing
brake pads .
– Fit rear wheels ⇒ Rep. gr. 44 ; Tightening wheel bolts .
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Note
When removing the test gauge, take care not to move the slid‐
♦
ing ring. This would give an incorrect measurement.
Note where the test gauge makes contact on the rear of the
♦
brake pad and include the thickness of the damper plate in the
calculation if necessary.
In the case of certain wheel combinations, the front wheels
♦
may have to be removed as well.
The scale on the metal ruler must begin directly at the ruler's
♦
edge; otherwise the measurement will be incorrect.
3.16 Brake discs: checking for surface rust
and operating brakes to clean if neces‐
sary
Checking brake discs ⇒ page 28
Operating brakes to clean brake discs
3.16.1 Checking brake discs
Procedure:
– Check outside of all brake discs for surface rust.
– If necessary, operate brakes to clean brake discs
⇒ page 28 .
Note
The brake discs can be damaged irreparably if surface rust is not
removed at the specified intervals.
3.16.2 Operating brakes to clean brake discs
Procedure:
– Accelerate vehicle to 40 km/h, then brake gently to 10 km/h
(do this five times).
– Accelerate vehicle to 40 km/h, then brake sharply to a stand‐
still (do this five times).
28
3. Maintenance
⇒ page 27 ): Renew brake
⇒ page 28