Front Brake Caliper Piston, FN-3: Installing

-- Insert the inner seal in the brake caliper groove -arrow-.

Fig 1: Identifying Sealing Ring Installed In Brake Caliper

Courtesy of AUDI OF AMERICA, LLC

-- Press the protective cap onto the brake caliper housing so that it contacts the brake caliper housing all around.

Fig 2: Pressing Protective Cap Onto Brake Caliper Housing So That It Contacts Brake Caliper Housing All Around

Courtesy of AUDI OF AMERICA, LLC

-- It should no longer be possible to remove the protective cap from the brake caliper housing by hand.

-- Thinly coat piston and seal with assembly paste G 052 150 A2 before inserting.

-- Press the brake piston lightly on the protective cap.

Do not angle piston, to avoid damaging the seal sleeve.

-- Blow the protective cap on with pressurized air (max. 3 bar). The protective cap will thereby jump over the brake piston.

-- Press the brake pistons into the caliper using T10145.

Fig 3: Pressing Piston Into Brake Caliper Housing Using Piston Resetting Tool T10145

Courtesy of AUDI OF AMERICA, LLC

Do not angle piston, to avoid damaging the seal sleeve.