Dual master cylinder (Mercedes-Benz S-Class W220)

Dual master cylinder

1 - Tank seat seal; 2 - Cuff; 3 - Piston (to the pusher); 4 - Lock washer; 5 - Retaining ring; 6 - Vacuum seal; 7 - Intermediate ring; 8 - Clip; 9 - Filling washer; 10 - Primary clutch; 11 - Support ring; 12 - Spring plate; 13 - Float; 14 - Connecting screw; 15 - Locking screw; 16 - Tank cover; 17 - Spring; 18 - Ring couplings; 19 - Spring plate; 20 - Piston (float contour); 21 - Spring; 22 - Body; 23 - Splash guard; 24 - Mesh filter; 25 - Lid; 26 - Compensator; 27 - Contact insert; 28 - Sealing ring; 29 - Location of the stepper tandem locking screw

Components of the master brake cylinder

3, 7, 20 - Pistons; 5 - Retaining ring; 8 - Stop plate; 9 - Traffic jams; 10 - Tank; 22 - Body; 27 - Guide pin

The Tandem type master cylinder is shown in the illustration.

Disassembly

1. Lightly press pin 3 and remove cylindrical pin 27 using pliers.

2. Remove retaining ring 5 and remove piston 3 together with the secondary seal from housing 22.

3. Remove the floating piston from the housing 22 using pliers.

4. Wipe the case and check the internal surfaces of the case for damage.

5. Wipe all parts with new brake fluid.

Assembly

1. Disconnect sleeve 040 from sleeve 041.

2. Remove the secondary seal and piston from sleeve 041.

3. Secure the housing with 22 holes facing down.

4. Lubricate the housing hole 22 with brake fluid.

4. Lubricate the housing hole 22 with brake fluid.

5. Insert the sleeve 040 into the hole and press the floating piston 20 until it stops using a screwdriver. When installing the piston, make sure that the guide groove (arrow) is installed vertically.

6. Insert the cylindrical pin and remove the bushing 040.

7. Secure the brake cylinder with the holes facing up.

8. Insert the secondary seal into housing 22 and press it in.

8. Insert the secondary seal into housing 22 and press it in.

9. Secure piston 7, insert lock plate 8 and secure it with lock ring 5. Make sure that lock ring 5 is correctly positioned in the groove of housing 22.

10. Lubricate plugs 9 with brake fluid and press them into housing 22. Install reservoir 10 with one tube onto housing 22, turn 180° and then install the second tube onto housing 22.