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Removing and installing brake caliper (C/SiC) > < Servicing brakes (C/SiC)

A4 Mk2

Removing and installing brake pads (C/SiC)
Removing and installing brake pads (C/SiC)
Removing
  Note
t  The brake caliper does not have to be detached in order to remove the brake pads.
t  Mark brake pads when removing them if they are to be reinstalled. Reinstall in their original position to prevent uneven braking.
–  Raise vehicle.
–  Remove wheels.
  Caution
On vehicles with ceramic brakes the wheel must not be allowed to drop onto the brake disc. This would cause irreparable damage to the disc. Screw two assembly pins (from vehicle tool kit) into the wheel bolt holes when removing and fitting a wheel. Insert the long assembly pin into the top hole.
   
–  Secure brake disc with one wheel bolt see -arrow-.
  A46-0249
–  Unplug connector for brake pad wear indicator as shown in illustration.
  A46-0253
–  Turn connector 90° while using a screwdriver to release connector from bracket.
–  Pull connector upwards out of bracket and detach wire.
  Note
The brake caliper does not have to be detached in order to remove the brake pads.
  A46-0252
–  Using commercially available pliers, disengage the two springs from the guide pin -3- (left and right).
–  Remove bolt for guide pin -18-.
–  Pull guide pin -3- out of brake caliper.
  WARNING
Retaining spring is under tension and could cause injury when pulling out the guide pin if suitable precautions are not taken.
–  Remove retaining spring -2-
  Note
Before removing old brake pads, press pistons back into cylinders with resetting appliance. Before pressing the pistons back, draw off brake fluid from the reservoir with a bleeder bottle. Otherwise, fluid can overflow and cause damage, particularly if reservoir has been topped up.
  WARNING
Brake fluid is poisonous and must NOT be sucked through a hose with the mouth.
–  Remove brake pads from brake caliper housing.
Only use methylated spirits to clean the brake caliper housing.
Installing
–  Insert brake pads into brake caliper.
  Note
The brake pad with the wear indicator wire is located on the inside.
  A46-10075
–  Insert retaining spring in brake caliper housing -2-.
–  Slide guide pin -3- through brake caliper.
  WARNING
After introducing the guide pin, the retaining spring must be pressed underneath the guide pin so that it is under tension. If the retaining spring is fitted incorrectly, the brake pads will be out of position and the function of the brakes will be impaired.
–  Tighten bolt -18- to the specified torque.
–  Using commercially available pliers, engage the two springs on the guide pin -3- (left and right).
–  Connect wear indicator connector and insert wire in dust cap and protective cap.
–  Fit wheels → ELSA/ Wheels and Tyres Guide → Rep. Gr.44
–  Check brake fluid level and top up if necessary.
  Note
After installing the brake pads and before driving the vehicle, depress brake pedal firmly several times with the vehicle stationary, so that the brake pads are properly seated in their normal operating position.
  A46-10075

Removing and installing brake caliper (C/SiC) > < Servicing brakes (C/SiC)