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Home >> Audi >> 2021 >> A4 Quattro Premium Plus, 2.0L Eng VIN B >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Components (Brake System) (1 Of 2) >> 47 Hydraulic Components >> Rear Brake Caliper >> Brake Caliper Piston, Removing And Installing >> Removing

Brake Caliper Piston, Removing And Installing: Removing

GWWN47-10252Courtesy of AUDI OF AMERICA, LLC

-- Using an 8 mm internal multi-point socket, turn the spindle counter-clockwise -arrow-. As a result, the thrust nut pushes the brake caliper piston out of the brake caliper.

Fig 1: Identifying Spindle Rotated Using A Torx Insert T45
GWWN47-10054Courtesy of AUDI OF AMERICA, LLC

-- Remove the brake caliper piston with the protective cap from the brake caliper.

-- Remove the seal using the Trim Removal Wedge :3409  .

Fig 2: Identifying Wedge 3409 To Remove Seal
GWWN47-0078Courtesy of AUDI OF AMERICA, LLC

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