check engine FORD SIERRA 1986 1.G Braking System Workshop Manual

4Withdraw the module, and disconnect the
multi-plug (see illustration).
Refitting
5Refitting is a reversal of removal but on
completion check the operation of the ABS
warning lamp as described in the
manufacturer’s handbook.
Note: A new O-ring must be used when
refitting a sensor.
Front wheel sensor
1Apply the handbrake, loosen the relevant
front roadwheel nuts, then jack up the front of
the vehicle and support on axle stands (see
“Jacking and Vehicle Support”). Remove the
roadwheel.
2Working under the bonnet, unclip the ABS
wiring loom from the chassis side member,
and disconnect the wheel sensor wiring plug.
3Unscrew the mounting bolt and withdraw
the sensor (see illustration).
4Refitting is a reversal of removal, bearing in
mind the following points.
5Clean the bore in the hub carrier, and smear
the bore and the sensor with lithium based
grease.
6Use a new O-ring seal when refitting the
sensor.
Rear wheel sensor
7Chock the front wheels, loosen the relevant
rear roadwheel nuts, then jack up the rear of
the vehicle and support on axle stands.
Release the handbrake and remove the
roadwheel.
8Working inside the vehicle, lift up the rear
seat cushion, then remove the side kick panel
and fold the carpet forwards to gain access to
the wheel sensor wiring plug (see
illustrations).
9Remove the wiring plug from its clip, and
disconnect it.
10Prise out the floor panel grommet, then
feed the sensor wiring through the floor panel.
11Free the handbrake cable from its clip on
the suspension lower arm.12Where applicable, disconnect the wiring
to the disc pad wear sensor.
13Unscrew and remove the bolt from the
forward caliper guide pin, while holding the
pin stationary with a spanner.
14Swing the caliper rearwards to gain
access to the wheel sensor.
15Unscrew the bolt securing the sensor to
its mounting bracket.
16Refitting is a reversal of removal, bearing
in mind the following points.
17Clean the bore in the sensor mounting
bracket, and smear the bore and the sensor
with lithium based grease.
18Use a new O-ring seal when refitting the
sensor.
Removal
1The deceleration sensitive valve is located
on the left-hand side of the engine
compartment (see illustrations).
2Place a suitable container beneath the
valve to catch spilt fluid, then unscrew the
union nuts and disconnect the fluid pipes.Plug the open ends of the pipes and valve to
prevent fluid leakage and dirt ingress. If fluid is
accidentally spilt on the paintwork, wash off
immediately with cold water.
3On early models, the valve is secured to the
mounting bracket on the inner wing by a
single bolt. Unscrew the bolt and remove the
valve.
4On later models, the valve is secured to the
mounting bracket by a clip. Remove the clip
and slide out the valve.
Refitting
5Refitting is a reversal of removal, but note
that the early type of valve must be fitted with
the cover bolts facing forwards, and the later
type of valve must be fitted with the smaller
diameter stepped end facing forwards.
6On completion, bleed the rear hydraulic
circuit.
23Deceleration sensitive valve
(all models with conventional
braking system)
- removal and refitting
22Wheel sensor (ABS)
- removal and refitting
10•18Braking system
21.4 Withdraw the module and disconnect
the multi-plug - ABS22.8a Remove the side kick panel
(securing screws arrowed) for access to
the rear wheel sensor wiring plug - ABS
23.1b Later type deceleration sensitive
valve23.1a Early type deceleration sensitive
valve
22.8b Rear wheel sensor wiring plug
(arrowed) - ABS
22.3 Unscrew the mounting bolt and
withdraw the front wheel sensor - ABS
Caution: Refer to the
precautions in Section 1.