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

• Install the entire repair kit.
• Only use mineral spirits to clean the brakes.
• When a brake caliper piston or a piston cylinder are damaged, the brake caliper must be replaced.

-- Clean the surface of the brake caliper piston only with mineral spirits and let it dry.

-- Insert the seal into the brake caliper.

-- Place the protective cap on the brake caliper piston.

Fig 1: Identifying Protective Cap On Piston

Courtesy of AUDI OF AMERICA, LLC

-- Without tilting, push the brake caliper piston with inserted protective cap using constant pressure.

-- Insert the Piston Resetting Tool -T10145- and the Thrust Piece: T40325  into the brake caliper.

-- Slowly push the protective cap -1- in using the Piston Resetting Tool -T10145- and Thrust Piece: T40325  .

Courtesy of AUDI OF AMERICA, LLC

• The protective cap must fit tightly in the groove. If necessary, push down on it slightly with the Piston Resetting Tool -T10145-.
• The protective cap must no longer be able to be pulled out of the brake caliper by hand.

-- Repeat the work procedure on the next brake caliper piston.