Brake Caliper Piston, Removing And Installing, 1LA And 1LJ: Installing

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-- The surface of the piston and seal must only be cleaned with mineral spirits and then dried.

-- Thinly coat piston and seal with Assembly Paste G 052 150 A2 before inserting.

-- 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 tilt the piston in order to avoid damaging the sealing boot.

-- 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 Piston Resetting Tool T10145.

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

Courtesy of AUDI OF AMERICA, LLC

Do not tilt the piston in order to avoid damaging the sealing boot.

NOTE:

The inner sealing lip of the protective cap thereby slips into the groove on the piston.