Brake system specifications (Audi A4 B5)

Front brakes

System type - Disc brakes with single-piston floating caliper

Front brakes

Lucas — ATE/Teves

Disc diameter - 280 mm / 288 mm

Disc thickness:

• Non-ventilated discs:
• New - 15mm / 13mm
• Minimum thickness - 13mm / 22mm
• Ventilated discs:
• New - 25mm / 22mm
• Minimum thickness - 23mm / 20mm

Maximum disc runout - 0.05 mm / 0.05 mm

Thickness of brake pad friction material (all types):

• New - 14 mm
• Minimum allowable - 2 mm

Rear brakes

Disc diameter - 245 mm

Disc thickness:

• New - 10 mm
• Minimum allowable - 8 mm

Permissible disc runout is 0.05 mm

Thickness of brake pad friction material:

• New - 12 mm
• Minimum - 2 mm

Brake servo booster

Distance from the rod hinge to the mating surface of the amplifier:

• Left hand drive models - 159.0±0.5 mm
• Right hand drive models - 173.2±0.5 mm

Tightening torques for threaded connections Nm

ABS Hydraulic Block Nuts - 10

Brake pedal axle to control lever mounting bolt - 25

Front brake caliper (ATE/Teves):

• Guide pins - 25
• Mounting bracket bolts - 125

Wiring/Brake Pipe Mounting Bracket Bolt - 10

Front brake caliper (Lucas):

• Bolts* of guide pins - 30
• Caliper Bracket Mounting Bolts - 125
• Wiring/Brake Hose Mounting Bolt - 10

Handbrake lever mounting nuts - 25

Brake pipe union nuts - 15

Master Cylinder Fastening Nuts - 50

Rear brake caliper:

• Bolt* of guide pin - 30
• Mounting bracket bolt - 85

Servo Booster/Pedal Bracket Mounting Bolts (T45) - 25

* Use new bolts/nuts

[Material republished from the website AUDIMANUAL]