A3 Mk2
| Brakes |
| Brake system | |||||
| Diagonal dual-circuit brake system, anti-lock brake system (ABS) with electronic brake pressure distribution (EBPD). Certain equipment versions or model production dates additionally feature electronic differential lock (EDL), traction control system (ASR) and electronic stabilisation program (ESP). | |||||
| Brake master cylinder | Ø mm | 22.2 | |||
| Brake servo | Ø in inches | Left-hand drive vehicles: 10 Right-hand drive vehicles: 7 / 8 tandem | |||
| Function | Pneumatic | ||||
| Servo assist factor | i = | 5 | |||
| Front brakes | ||||||||
| Brakes (PR No.) | 1ZA | 1ZC / 1ZM | 1ZD / 1LJ | 1ZE | 1ZP | 1ZF | 1ZK / 1LK | |
| Front brake caliper | FN 3 | FN 3 | FN 3 | FN 3 | FN 3 | FS III | FNRG-57 | |
| Piston | Ø mm | 54 | 54 | 54 | 54 | 54 | 54 | 57 |
| Front brake disc | Ø mm | 312 | 312 | 312 | 288 | 288 | 280 | 345 |
| Brake disc thickness (ventilated) | mm | 25 | 25 | 25 | 25 | 25 | 22 | 30 |
| Brake disc wear limit | mm | 22 | 22 | 22 | 22 | 22 | 19 | 27 |
| Pad thickness (new, without backplate) | mm | 14.8 | 14 | 14 | 14 | 14 | 14 | 14.8 |
| Pad wear limit (without backplate) | mm | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
|
| Front brakes (RS 3) | |
| Brakes (PR No.) | 1LG |
| Front brake caliper | Brembo (M4) |
| Piston | Ø 40 / 44 mm |
| Front brake disc | Ø 370 mm |
| Brake disc thickness (ventilated) | 32 mm |
| Brake disc, wear limit | 30 mm |
| Pad wear limit (without backplate) | 2 mm |
| Servicing front brakes (RS 3) → Chapter |
| Rear brakes (RS 3) | ||
| Rear brake caliper | CII 41 HR | |
| Piston | Ø mm | 41 |
| Rear brake disc | Ø mm | 312 |
| Brake disc thickness (ventilated brake disc) | mm | 22 |
| Brake disc, wear limit | mm | 19 |
| Pad wear limit (without backplate) | mm | 2 |
