Brake Caliper Piston, Removing And Installing, Single-Piston Brake: Installing

-- Clean the surfaces on the brake caliper piston and gasket only with mineral spirits and then dry.

-- Thinly coat the brake caliper piston and seal with Lithium Lubricating Grease: G 052 150 A2  before installing.

-- Insert the seal into the brake caliper.

-- Place the protective cap with outer sealing lip on the brake caliper piston.

Fig 1: Identifying Protective Seal With Outer Sealing Lip On Piston

Courtesy of AUDI OF AMERICA, LLC

-- Insert the inner sealing lip in the cylinder groove using the : 3409  at the same time hold the piston in front of the brake caliper.

Fig 2: Inserting Inner Sealing Lip Into Grove In Cylinder Using Wedge 3409

Courtesy of AUDI OF AMERICA, LLC

-- Press the brake caliper piston with the piston resetting tool -1- in the brake calipers, at the same time to not tilt.

Fig 3: Identifying Piston Pressed Into Brake Caliper Using Piston Resetting Tool

Courtesy of AUDI OF AMERICA, LLC

• Outer sealing lip of protective cap will then engage in the brake caliper piston groove.