Brakes Pr Codes
The following tables show the PR number code key. This is important in order to know the brake caliper/brake rotor and brake pad combination.
| Brake system | ||||
| Dual-circuit brake system with diagonal distribution and ABS, EBV, EDL, ASR, ESP, ECD and EPB |
| Front Brakes | ||||
|---|---|---|---|---|
| PR Number | 1LT | 1LA/1LB | 1LJ | |
| Brake caliper | FN3 16" | FBC 16" | FBC 17" | |
| Ventilated brake rotor | diameter mm | 314 | 320 | 345 |
| Brake rotor, thickness | mm | 25 | 30 | 30 |
| Brake rotor, wear limit | mm | 23 | 28 | 28 |
| Pad thickness with backing plate and dampening sheet | mm | 20.3 | 20.3 | 20.3 |
| Brake pad wear limit with backing plate and dampening sheet | mm | 10 | 10 | 10 |
| Front Brakes 1LM | ||
|---|---|---|
| Ventilated brake rotor | diameter mm | 365 |
| Brake rotor, thickness | mm | 34 |
| Brake rotor, wear limit | mm | 32, 4 |
| 8-piston brake caliper, Brembo | diameter mm | 32 / 28 |
| Brake pad thickness with backing plate and dampening sheet | mm | 17 |
| Brake pad, wear limit with backing plate and dampening sheet | mm | 9.6 |
| Backing plate | mm | 5, 0 |
| Dampening sheet | mm | 1, 6 |
Hairline cracks on brake rotor friction surfaces are often observed during brake repairs. Hairline cracks up to 10 mm long are not a technical flaw and are not cause for brake rotor replacement.
Brake rotors with friction surfaces that have worn through should be replaced.
| Ceramic Front Brakes 1LW | ||
|---|---|---|
| Brake caliper | Brembo | |
| Ventilated brake rotor | diameter mm | 380 |
| Brake rotor, thickness | mm | 38 |
| Brake rotor, wear limit | The wear value is the minimum brake rotor thickness is stamped into the brake rotor cup when it is manufactured. | |
| Brake caliper, 6 piston monoblock | diameter mm | 2 x 32/ 36/ 38 |
| Minimum pad thickness with backing plate and dampening sheet | mm | 9.5 |
Ceramic brakes are installed only in the front on this model.
Hairline cracks on the friction surface on ceramic brakes occur during the manufacturing process and can be found on new brakes in different stampings. Hairline cracks on the friction surfaces are not a reason to exchange the ceramic brake rotors.
Every brake rotor has a singed groove to recognize the wear limit. If the brake rotor friction surface the groove are worn down to an even level, the brake rotor wear limit has been reached.
| Rear Brakes | |||
|---|---|---|---|
| PR number | 1KW/2EH | 1KE | |
| Brake Caliper | CII-43 EPB (16") | CII-43 EPB (17") | |
| Brake Rotor | diameter mm | 300 | 330 |
| Unvented brake rotor thickness | mm | 12 | |
| Internally vented brake rotor thickness | 22 | ||
| Brake rotor, wear limit | mm | 10 | 20 |
| Brake caliper, piston | diameter mm | 43 | 43 |
| Pad thickness with backing plate and dampening sheet | mm | 17.5 | 17.5 |
| Brake pad wear limit with backing plate and dampening sheet | mm | 7 | 7 |
The brake system installed in a vehicle is indicated on the vehicle data label by the relevant PR number -A and B-.
Hairline cracks on brake rotor friction surfaces are often observed during brake repairs. Hairline cracks up to 10 mm long are not a technical flaw and are not cause for brake rotor replacement.
Brake rotors with brake pads that have worn through should be replaced.