Remove/install BAS diaphragm travel sensor - AR42.31-P-6002GI

MODEL 163.113 /128 /157 /172 /174 /175, 163.154 as of 1.9.98 

Fig 1: Identifying BAS Diaphragm Travel Sensor Components

	Remove/Install
1	Reduce pressure in brake booster by operating brake pedal several times
2	Detach heat shield (1b) by unscrewing nut (19) from master brake cylinder		*BA42.10-P-1001-05A
3	Disconnect BAS diaphragm travel sensor connector (2)	To disconnect, press the release catch (arrow) on the underside of the plug.
4	Remove locking ring (16b)	Use a suitable tool, e.g. angled scriber. Installation:  Ensure locking ring is correctly seated.
5	Pull out BAS diaphragm travel sensor (A7/7b1)	Installation:  Insert diaphragm travel sensor into groove and press in as far as the stop.
6	Check O-ring (16c) and replace if necessary
7	Install in the reverse order

Master brake cylinder

Number	Designation		Model 163
BA42.10-P-1001-05A	Nut, brake master cylinder to brake booster	Nm	25