BMW 1989-1995 525i Service Manual page 328

340-12
BRAKES
To replace parking brake cable
1. Remove the rear brake caliper and rotor. See Brake
Pads, Calipers, and Rotors.
2.
Remove the parking brake shoes as described above .
3. Remove the parking brake cable from the cab le holder
on the trailing arm.
4. Working inside the car. lift the parking brake lever boot
out of the console. Remove the cable adjusting nut.
See Fig. 16.
5. Slide the cable out of the housing and install a new cable.
6.
The remainder of installation is the reverse of removal.
Adjust the parking brake as described above.
ANTI LOCK BRAKE SYSTEM (ASS)
The ASS system is designed to be maintenance free . There
are no adjustments that can be made to the system . Repair
and troubleshooting of the major ASS system components re-
quires special test equipment and knowledge and should be
done by an authorized SMW dealer using the special ASS test
equipment.
ASS is self-tested each time the car is started by the ASS
diagnostic unit. Once the test is complete. the ASS dashboard
light turns off. If the ASS dashboard light remains lit or comes
on at any time during driving , a system fault has occurred and
the ASS system is electronically disabled. The conventional
braking system remains fully functioning.
ASS System Inspection
A visual inspection of the ASS system may help to locate
system faults. If no visual faults can be found and the ASS
light remains on, have the system diagnosed by an authorized
SMWdealer.
Carefully inspect the entire ASS wiring harness, particularly
the pulse sensor harnesses and connectors near each wheel.
Look for chaf ing or damage due to incorrectly routed wires .
Remove the pulse sensors and clean the sensor tips. In-
spect the toothed pulse rings for missing teeth or other dam-
age. Check the rings for dirt . brake pad dust accumulation , or
heavy rust deposits that could alter the clearance between the
sensor tip and the ring.
NOTE-
If
a
toothed ring
is
damag ed, the entire wheelllUb with
integral wheel bearing must be replaced. See 310
Front Suspension or330 Rear Suspension .
AN T/LOCK BRA KE SYSTEM (ABSj
To replace ASS pulse sensor
1.
Raise the front of the car.
WARNING-
Make sure the car
is
firmly supported on jack stands
designed for the purpose. Place the jack stands be-
neath
a
structural chassis poinr. Do not place jack
stands under suspension parts.
2. Unscrew the pulse sensor mounting bolt. Remove the
sensor from its housing . Remove the harness from any
retaining mounts. See Fig.
19.
Fig. 19. Front ASS pulse sensor mounting boll (arrow).
3. Working in the engine compartment (front wheel sen -
sors) or under the rear seat (rear wheel sensors), dis -
connect the pulse sensor connector and remove the
sensor from the car. See Fig.
20.
Fig. 20. Front ASS pulse sensor harness connector
(arrow).
4. Apply a thin coat of Molykote Longterm 2 or an equiva-
lent grease to the pulse sensor and housing. The re-
mainder of installation is the reverse of removal.