Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI1998A8 SEDAN (4D2) V8-3.7L (AEW)REPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSBRAKES AND TRACTION CONTROLDISC BRAKE SYSTEMBRAKE CALIPER
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Brake Caliper
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Brake Caliper
Tightening torques
Brake caliper FS-3 45 Nm
Brake caliper HP-2Brake line to brake caliper 12 Nm
Brembo brake caliper 12 Nm
Vent valve to brake caliper 10 Nm
Rear brake caliper 45 Nm
Front
Brake caliper, pistons
FN-3 15"/16", Diameter in mm 57 mm
HP 2 (15"/16", Diameter in mm 42.8 mm
Brembo (17"), Diameter in mm 40.0, 46.0 mm
Brake caliper
Type
FN-3 15"/16"
HP 2 (15"/16")
Brembo (17")
Rear
Brake caliper, pistons
C 38, Diameter in mm 38.1/36.0
C 43 (16"), Diameter in mm 42.8/40.8
C 43 (16"/17", Diameter in mm 42.8/40.8
Brake caliper, Lucas
Type
C 38
C 43 (16")
C 43 (16"/17")
Brake caliper FS-3 45 Nm
Brake caliper HP-2Brake line to brake caliper 12 Nm
Brembo brake caliper 12 Nm
Vent valve to brake caliper 10 Nm
Rear brake caliper 45 Nm
Front
Brake caliper, pistons
FN-3 15"/16", Diameter in mm 57 mm
HP 2 (15"/16", Diameter in mm 42.8 mm
Brembo (17"), Diameter in mm 40.0, 46.0 mm
Brake caliper
Type
FN-3 15"/16"
HP 2 (15"/16")
Brembo (17")
Rear
Brake caliper, pistons
C 38, Diameter in mm 38.1/36.0
C 43 (16"), Diameter in mm 42.8/40.8
C 43 (16"/17", Diameter in mm 42.8/40.8
Brake caliper, Lucas
Type
C 38
C 43 (16")
C 43 (16"/17")
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.