Audi Workshop Service and Repair Manuals > A4 Mk3 > Brake system | Technical data

Brakes

The PR numbers are listed in the following tables. They indicate the required combination of brake calipers, discs and brake pads.

Brake system
Diagonally split dual-circuit braking system with ABS, EBPD, EDL, ASR, ESP, ECD and vacuum pump

		Front brakes
Factory code (PR No.)		1LT	1LA	1LJ
Brake caliper		FN3 (16")	FBC (16")	FBC (17")
Ventilated brake disc	Ø mm	314	320	345
Brake disc, thickness	mm	25	30	30
Brake disc, wear limit	mm	23	28	28
Brake pad thickness (including backplate and damper plate)	mm	20.3	20.3	20.3
Brake pad wear limit (including backplate and damper plate)	mm	10	10	10

Rear brakes
Factory code (PR No.)		1KW	1KE
Brake caliper		CII-43 EPB (16”)	CII-43 EPB (17”)
Brake disc	Ø mm	300	330
Brake disc (not ventilated), thickness	mm	12	------
Brake disc (ventilated), thickness		------	22
Brake disc, wear limit	mm	10	20
Brake caliper, piston	Ø mm	43	43
Brake pad thickness (including backplate and damper plate)	mm	17.5	17.5
Brake pad wear limit (including backplate and damper plate)	mm	7	7

The type of brake system installed in the vehicle is indicated by the corresponding PR number -A and B- on the vehicle data sticker.

t	Allocation → ETKA

Note

t	When performing repair work on brakes, hairline cracks are often found on the friction surface of the brake discs. Hairline cracks up to a length of 10 mm do not present a technical problem and do not justify a renewal of brake discs.

t	Brake discs and pads with cracks going all the way across the friction surface must be renewed.

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