Removing And Installing Pressure Warning Switch Of Lock Hydraulics - Porsche 928 Workshop Manual

928
Differential. transaxle svstem
39
Removing and installing pressure
warning switch of lock hydraulics
'I. Wtih the ignition key in position 0, pull off
both plugs at the pump assembly.
2. Completely depressurize the system. To do
this, slowly open the bleeder valve on the
lock solenoid valve and drain the brake fluid
into a collection bottle.
Important: The system is under a
press-
ure of up to 180 bar. Wear goggles and
protective gloves.
3. Remove pressure warning switch (No. 2)
with special tool 9524. Prevent the pump as-
sembly from turning while loosening the
switch.
Important:
First clean the area around the
pressure warning switch and cover it with
lint-free cleaning cloths to trap the small
amount of residual brake fluid that emerges.
12
i
I
Installing
1. Screw in the pressure warning switch (No.
2) and tighten to a torque of 26 Nm (19 fl-
lb). Replace the O-ring if necessary. Pre-
vent the pump assembly from turning while
tightening the pressure warning switch.
Note
Wet the sealing ring with brake fluid only.
Never use brake cylinder paste. Absolute cle-
anliness is essential. Use only lint-free clea-
ning cloths.
2. If there is an electrical fault at the pressure
warning switch, always replace the hydrau-
lic pump relay (in the luggage compartment)
as well.
a
PSD diagnosiwTroubleshooting
Printed in Germany - XXN, 1996
D39 - 257