Removing and installing BAS diaphragm travel sensor

AR42.31-P-6002A

Removing and installing BAS diaphragm travel sensor

7.9.96

1.8.99

Check diaphragm travel sensor for labeling

 New parts are marked with a white, yellow or blue "D" (Figure 1). The label may be on the side away from you.

 

Removing, installing



Notes on brake booster

AH43.20-P-0001-01A

1

Operate brake pedal several times until vacuum in brake booster is reduced.

 The diaphragm travel sensor sealing ring may be sucked into the brake booster if vacuum is present.

If this happens, the brake booster must be replaced.

2

Unplug BAS diaphragm travel sensor connector (A7/7x1)

3

Remove locking ring (16b)

Use a suitable tool, e.g. angled scriber (arrow).

Installation: Replace locking ring and ensure that it is correctly seated.

 Different manufacturers use different locking rings.

4

Pull out BAS diaphragm travel sensor (A7/7b1)

Installation: Rub a little spirit or soapy water onto the front of the diaphragm travel sensor so that O-ring slides correctly when inserted.

5

Replace O-ring

Installation: Insert O-ring into groove in brake booster and ensure that it is correctly seated.

6

Install in the reverse order



Checking

7

Start engine

 Operate brake several times.

8

Switch off engine

9

Check diaphragm travel sensor for leaks

 There must not be any air flow noises audible at the brake booster.