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A5

Brake system > Technical data > Brakes

Brakes
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 EPB

   
Front brakes (PR 1LT/1LA/1LJ)
Factory code (PR No.) 1LT1LA1LJ
Brake caliper FN3 (16")FBC (16")FBC (17")
Ventilated brake discØ mm314320345
Brake disc, thicknessmm253030
Brake disc, wear limitmm232828
Brake pad thickness (including backplate and damper plate)mm20.320.320.3
Brake pad wear limit (including backplate and damper plate)mm101010

   
Front brakes (PR 1LM)
Ventilated brake discØ mm365
Brake disc, thicknessmm34
Brake disc, wear limitmm32.4
Brake caliper, Brembo, 8 pistonsØ mm32 / 28
Brake pad thickness (including backplate and damper plate)mm17
Brake pad wear limit (including backplate and damper plate)mm9.6
Backplatemm5.0
Damper platemm1.6

  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 with cracks going all the way across the friction surface must be renewed.
   
Ceramic front brakes (PR 1LW)
Brake caliper Brembo
Ventilated brake discØ mm 380
Brake disc, thicknessmm 38
Brake disc, wear limit The minimum thickness of the brake disc is stamped onto the brake disc hub as a wear limit specification.
Brake caliper, 6 piston monoblockØ mm2 x 32/ 36/ 38
Minimum pad thickness (including backplate and damper plate)mm 9.5

  Note
In this model ceramic brake discs are installed on the front axle only.
  Note
Hairline cracks on the friction surfaces of ceramic brakes can be caused during manufacturing and therefore already appear to varying degrees when the brakes are new. Hairline cracks on the friction surfaces do not justify a renewal of the ceramic brake discs.
  Note
Each brake disc has a recessed groove for detecting the wear limit. When the friction surface of the brake disc is flush with the groove, the brake disc has reached the wear limit.
   
Rear brakes (PR 1KW/1KE)
Factory code (PR No.) 1KW1KE
Brake caliper CII-43 EPB (16”)CII-43 EPB (17”)
Brake disc Ø mm300330
Brake disc (not ventilated), thicknessmm12 
Brake disc (ventilated), thickness  22
Brake disc, wear limitmm1020
Brake caliper, pistonØ mm4343
Brake pad thickness (including backplate and damper plate)mm17.517.5
Brake pad wear limit (including backplate and damper plate)mm77

   
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.
  A00-10295

Brake system > Technical data > Brakes

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