Disassembly & Reassembly

Insert brake pad (b) in piston. See Fig 1 . Place a wooden board (a) into the recess of the caliper housing to catch the pistons so they are not damaged. Only one piston can be pressed out at a time. Hold the other piston securely in brake caliper housing using piston resetting tool.

Fig 1: Removing Front Caliper Piston (HP2, Steel Caliper)
Courtesy of AUDI OF AMERICA, INC.
Remove sealing rings using Wedge (3409). See Fig 2 .
NOTE: Apply a thin coat of brake cylinder paste G 052 150 A2, or equivalent, to brake cylinders, pistons and seals before reassembly. Also apply to to threads of caliper bleeder valve.

Fig 2: Removing Front Caliper Sealing Ring (HP)
Courtesy of AUDI OF AMERICA, INC.
Install piston dust seal onto piston. See Figure .
Insert inner sealing lip of piston dust seal using Wedge (3409). See Fig 3 . Hold piston in front of caliper housing for this procedure.

Fig 3: Installing Piston Dust Seal In Front Caliper (HP, Steel Caliper)
Courtesy of AUDI OF AMERICA, INC.
Insert piston in caliper bore by hand. Insert brake pad in piston before inserting in brake caliper housing. Outer sealing lip of protective cap will then engage in piston groove.