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Servolock for B4 brake

Servolock for B4 brake

To remove


1. Place the car on a hoist and turn the steering wheel full left lock.

2. Raise the car and put a receptacle underneath to collect any fluid spill.

3. Remove the front left wheel.

4. Remove the left outer track rod end from the steering swivel member. Use 87 91 287 puller.


5. Clean thoroughly around the transmission servo housing and on the subframe.

6. Press in the servo cover by applying a ½" drawbar handle with socket against the cover.


7. Remove the circlip.


8. Remove the cover, piston and spring from the transmission servo housing.


To fit


1. Assemble the piston and cover plus the spring. Lubricate the O-rings with Vaseline, non-acidic .


2. Position the piston package in the gearcase. Make sure the O-rings are not damaged.

3. Press in the piston package somewhat using a ½" drawbar handle with socket.


4. Thread the ring over the tool and onto the cover. Press the tool slightly and insert the circlip into its groove and fit the circlip.

5. Remove the tool and make sure the circlip is positioned correctly in the groove.

6. Clean away any fluid spill on the subframe.

7. Fit the outer track rod end with a new nut.

Tightening torque 35 Nm (26 lbf ft)


8. Fit the wheel and lower the car.

Tightening torque: 110 Nm (81 lbf ft)