Brake Pr Numbers

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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- 1LA, 1LB, 1LD, 1LJ, 1LT 1ZT
Production-relevant number (PR number)		1LT 1LY	1LA, 1LB	S-4/S5+1LJ, 1LD 1ZT
Brake caliper		FN3 16"	FBC 16"	FBC 17"
Brake rotor, ventilated	diameter in 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 PR- 1LM
Brake rotor, ventilated	diameter in mm	365
Brake rotor, thickness	mm	34
Brake rotor, wear limit	mm	32
8-piston brake caliper, Brembo	diameter in mm	32/28

NOTE:

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, PR- 1LW
Brake caliper		Brembo
Brake rotor, ventilated	diameter in mm	380
Brake rotor, thickness	mm	38
Brake rotor, wear limit		The wear value is the minimum brake rotor thickness during manufacturing and is stamped into the brake rotor cup.
Brake caliper, 6 piston monoblock	diameter in mm	2 x 32/ 36/ 38
Minimum pad thickness with backing plate and dampening sheet	mm	9.5

NOTE:

Depending on the version, the minimum weight of the brake rotor is stamped on it. The brake rotor must be weighed to assess additional wear. If the minimum weight is reached, then the brake rotor must be replaced. Always replace brake rotors on both sides of the axle.

NOTE:

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 replace the ceramic brake rotors.

NOTE:

For these models, the ceramic brakes are only installed in the front.

Rear brakes PR- 1KW, 1KE, 1KP, 2EH
Production-relevant number (PR number)		1KW, 2EH	S4/S5+1KE, 1KP
Brake caliper		CII-43 EPB (16")	CII-43 EPB (17")
Brake Rotor	diameter in mm	300	330
Unvented brake rotor thickness	mm	12	---
Internally vented brake rotor thickness		---	22
Brake rotor, wear limit	mm	10	20
Pad thickness with backing plate and dampening sheet	mm	17.5	17.5

Rear brakes PR- GP0, GP1 GP2 1KZ
Production-relevant number (PR number)		GP0, GP1	GP2 2ED 1KZ
Brake Rotor	diameter in mm	330	330
Brake rotor thickness	mm	22	22
Brake rotor, wear limit	mm	20	20

The brake system installed in a vehicle is indicated on the vehicle data label by the relevant PR number -A and B-.

The 8T model type is shown here as an example.

Fig 1: Locating Brake System Information On Vehicle Data Label, PR Number -A And B-

Courtesy of AUDI OF AMERICA, LLC

Allocate correct components.
The brake system installed in a vehicle is indicated on the vehicle data label by the relevant PR number -A and B-.
The 8K model type is shown here as an example.

Fig 2: Identifying PR Number Code
Courtesy of AUDI OF AMERICA, LLC

NOTE:

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.