BMW 1989-1995 525i Service Manual page 309

REAR SUSPENSION
330-11
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3. Working beneath the rear of the car, disconnect the
control link from the regulator valve lever. With the
transmission in neutral and the parking brake applied ,
start the engine.
WARNING-
Only run the car in
a
well·ventilated area. Exhaust
fumes can be fatal.
4. Working beneath the rear of the car, operate the LAD
regulator lever to three positions as specified below.
Have an assistant note the pressure gauge readings at
each position and compare them with the specifica-
tions listed.
Pump Pressure
• Lever in center position
(car at normal position).. . . . 20-30 bar (290-435 psi)
• Lever in forward position
(car raised) more than 120 bar (1740 psi)
• Lever in rear position
(car lowered) 20-30 bar (290-435 psi)
Fig. 17. Power steering fluid reservoir on cars without LAD (left), and
with LAD (right).
The LAD hydraulic system uses an additional pump inte-
grated into the power steering pump. For information on re-
moving and installing the power steering/LAD pump, see 320
Steering and Wheel Alignment.
To pressure test LAD system
Testing the LAD hydraulic pump pressure requires a 0-150
bar (0-2000 psi) pressure gauge and the correct fittings to in-
stall the gauge in-line with the LAD hydraulic system . Make
sure the power steering/LAD pump drive belt is in good condi-
tion and properly tensioned .
1. Raise the rear of the car.
WARNING -
Make sure that the car is firmly supported on jack
stands designed for the purpose. Place the jack
stands beneath
a
structural chassis point. Do not
place jack stands under suspension parts.
2. Connect the gauge betwee n the pump and the pump
output fitting. Use new sealing washers.
NOTE -
Be sure to connect the gauge to the LAD hydraulic sys-
tem and not the power steering system. The LAD hy-
draulic output line will be going to the rear of the car.
5. When finished testing , remove the pressure gauge and
install the fluid hose to the pump. Take care not to over-
torque the banjo bolt. Fill and bleed the system as de-
scribed below under To fill and bleed LAD system.
Tightening Torque
• Control link to LAD regulator valve lever
(self-locking nut) 9 Nm (80 in-Ib)
• Hydraulic hose to LAD pump 31 Nm (22 tt-lb)
6. Adjust the rear ride height as described below, Install
the control link to the regulator valve lever using a new
self·locking nut.
To adjust ride height (cars with LAD)
Adjusting the ride height on LAD-equipped cars requires
that the car be placed over a pit or on a full platform lift with the
rear wheels on moveable plates . This allows the rear wheel
camber to adjust as the rear of the car is raised and lowered.
1. Put the car in neutral gear and release the parking
brake.
SELF·LEVELLING SUSPENSION (LAD)