Brake Caliper Piston, Removing And Installing, Rear Brakes: Installing

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

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

-- Insert the gasket into the brake caliper.

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

-- Turn the thrust nut far enough onto the spindle so that the dimension -a- = 15 mm (0.59 in.) is reached.

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-- Insert the inner sealing lip for the protective cap into the groove -arrows- in the brake caliper using the :3409  .

Fig 2: Identifying Inner Sealing Lip Of Protective Boot Inserted In Groove In Brake Caliper With Trim Removal Wedge 3409

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-- Slide the brake caliper piston -1- onto the thrust nut, which is only possible in four positions.

-- Carefully press the brake caliper piston into the brake caliper by moving the brake caliper piston.

-- Press the brake caliper piston far enough into the brake caliper until it touches the thrust nut.

Fig 3: Pressing Piston Into Brake Caliper Until It Contacts Pressure Nut

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-- Carefully turn the spindle clockwise in the direction of -upper arrow- until the thrust nut is at the stop.

Fig 4: Identifying Pressure Nut Clockwise

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• The protective cap must rest completely on the brake caliper -arrows-.
  Fig 5: Ensuring Protective Cap Is Seated Against Brake Caliper Housing

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-- Press the brake caliper piston into the brake caliper by hand.

Fig 6: Pressing Piston Into Brake Caliper

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