Clutch servo unit removal and installation

AR25.20-W-0300C

15.6.09

MODEL 950.0 /1 /2 /3, 952.0 /1 /2 /3, 953.1 /3, 954.0 /1 /2

MODEL 957 except CODE (IY2) Hydraulic fluid as per sheet 345.0

W25.20-1020-09

1 Plunger

2 Clutch servo assistance

3 Clutch travel sensor connector

8 Sealing ring

9 Banjo bolt

10 Sealing ring

11 Connector

4 Compressed-air line

5 Fuse

6 Hydraulic line

7 Banjo union (compressed air line)

W25.20-1055-12

2 Clutch servo assistance

3 Clutch travel sensor connector

4 Compressed-air line

6 Hydraulic line

12 Bracket, compressed air line

13 Electrical connector

Modification notes

15.2.06

Tightening torque added.

Step 4

 	Remove/install
Danger!	Risk of poisoning caused by swallowing brake fluid. Risk of injury caused by brake fluid coming into contact with skin and eyes.	Pour brake fluid only into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling brake fluid.	AS42.50-Z-0001-01A
	Brake fluid notes		AH42.50-P-0001-01A
1	Drain reservoir pressure of compressed air system
2	Separate clutch travel sensor connector (3)
3	Detach bracket of compressed air line (12)
4	Detach compressed-air line (4)	 When loosening the compressed air line (4) counterhold at the banjo bolt (9).
			*BA25.20-N-1010-01J
5	Unscrew the banjo bolt (9)	 When loosening the banjo bolt (9) counterhold at the banjo union (7).
		 Installation: Install new sealing rings (8).
			*BA25.20-N-1003-01J
6	Remove locking device (5) from connector (11) and detach hydraulic line (6)	 Collect escaping brake fluid using a suitable container.
7	Disconnect electrical connector (13)
8	Remove clutch servo unit (2)		*BA25.20-N-1001-01J
9	Remove plunger (1)	Installation: Clean and grease ball head and guide of plunger (1).	*BR00.45-Z-1001-06A
10	Detach connector (11)	 Only when replacing the clutch booster (2).
		Installation: Replace sealing ring (10).
			*BA25.20-N-1003-01J
11	Install in the reverse order
12	Bleed clutch operating system	Vehicles without code (GE1) electronic drive control	AR25.20-W-0070A
		Vehicles with code (GE1) electronic drive control	AR25.20-W-0070B

 Clutch booster

Number	Designation		Models 950, 952, 953, 954, 957


BA25.20-N-1001-01J	Bolt, clutch booster to transmission housing	Nm	50
BA25.20-N-1003-01J	Banjo bolt (compressed-air line) on clutch booster	Nm	40
BA25.20-N-1010-01J	Union nut (compressed-air line) at clutch booster	Nm	40

Repair materials

Number	Designation	Order number
BR00.45-Z-1001-06A	Long-life grease	A 000 989 63 51 11