BMW 1989-1995 525i Service Manual page 321

BRAKES
340-5
6. Remove the brake pads from the caliper. Where applica-
ble pry the pad wear sensor from the pad. See Fig. 5.
7. Inspect the brake caliper for signs of leakage. Check
that the caliper piston slides smoothly into the caliper.
Replace the caliper if any faults are found.
001 1256
Fig. 5. Brake pad wear sensor being pried from brake pad .
If
reusing
the sensor. use care when removing as they are easily darn -
aged during removal.
8. Clean the guide bolts thoroughly and caref ully inspect
them for damage. Faulty guide bolts could cause brake
failure.
9. Insert the brake pad wear sensor into the cutout in the
new pad where applicable.
NOTE -
If the brake lining indicator lighl came on p rior to brake
pad replacement. the wear sensor should be replaced.
10. Slowly press the piston back into the caliper. See Fig. 6.
NOTE -
• On ASS-equipped cars. it is easiest 10 open Ihe cali-
per bleeder screw and drain off some fluid when
pressing the piston back into the caliper. Open the
bleeder screw only when applying force to the piston.
Do not allow air to be drawn into the hydraulic circuit.
• Pressing the caliper piston in may cause the brake ttu-
id reservoir to overflow. To pre vent this. use
a
clean
syringe to first remove some fluid from the reservoir.
11 . Lightly coat the contact points of the new pads with
Plastilube" or an equivalent. Place the outer brake pad
onto the caliper. Place the inner brake pad with its lo-
cating spring onto the brake caliper piston. Route the
pad wear sensor wiring through the caliper opening
and bleeder dust cap.
00 11257
Fig. 6. Brake caliper piston being pressed into caliper. Use a rag to
protect caliper piston and seals.
12. The remainder of installation is the reverse of removal.
Do not lubricate the guide bolts. Once the brake assem-
bly is installed depress the brake pedal several times.
Tightening Torques
• Brake caliper to caliper
carrier (guide bolt) 35 Nm (26 fHb)
• Road wheel to hub 100
±
10 Nm (74
±
7 fHb)
To remove and install brake caliper
The front brake caliper assembly is shown in Fig. 7. The
rear brake caliper is shown in Fig. 9.
1. Raise the car and remove the wheel.
WARNING -
Make sure the car is firmly supported on jack stands
designed for the purpose. Place the jack stands be-
neath
a
structural chassis point. Do not place jack
stands under suspension parts.
2. Remove the pad carrier mounting bolts from the strut
assembly (front caliper) or from the trailing arm (rear
caliper). See Fig. 8.
3. Loosen the brake hose fitting at the caliper and spin the
caliper assembly 011 the hose.
4. Inspect the brake caliper lor any signs of leakage.
Check that the caliper piston slides smoothly into the
caliper. Replace the caliper if any faults are found.
BRAKE PADS. CALIPERS. AND ROTORS