Rear Brake Calipers (C38), Removing and Installing

Rear Brake Caliper Piston, Removing and Installing


Special Tools and Equipment:







3272 Reset Tool






3272/1 Support Plate






3409 Wedge


Removing







Fig 1. Unscrewing piston from brake caliper housing.

- Remove piston by turning threaded spindle - A - counter clockwise and knurled section - B - clockwise.








Fig 2. Removing seal using 3409 wedge.

Installing

- Use only appropriate solvent to clean surfaces of piston and protective seal, then dry.

- Apply thin coat of brake cylinder paste G 052 150 A2 to piston and protective seal before installing.








Fig 3. Pulling dust seal on with outer sealing lip on piston







Fig 4. Inserting inner sealing lip of dust seal using 3409 wedge.


Note:
Hold piston in front of caliper housing for this procedure.








Fig 5. Screwing piston into brake caliper housing until stop

- Install piston by turning threaded spindle - A - clockwise and knurled section - B - counter-clockwise.

Note:
Outer sealing lip of dust seal will then engage in piston groove.







Fig 6. Pre-bleeding brake caliper

- Open bleeder valve and fill with brake fluid using standard bleeder bottle until brake fluid flows out of threaded hole (brake hose connection) without bubbles. Close bleeder valve.

Note:
Position brake caliper as shown during pre-bleed procedure.