service FORD SIERRA 1988 2.G Braking System Workshop Manual

neck with a rubber band, or by refitting the
cap. This will reduce the loss of fluid during
the following procedure.
3Disconnect the flexible fluid hose from the
rigid brake pipe under the wing of the vehicle,
or alternatively unscrew the flexible hose from
the union on the caliper. Take care not to twist
the hose, and plug the open ends to prevent
fluid loss and dirt ingress.
4Remove the disc pads.
5On models fitted with Girling calipers (1.3
and early 1.6 litre models) (see illustration),
unscrew and remove the bolt from the lower
caliper guide pin, while holding the pin
stationary with a spanner, then remove the
caliper.
6On models fitted with Teves calipers (later
1.6, 1.8 and 2.0 litre models) (see
illustration), remove the caliper from the
vehicle.
7If required, the caliper carrier bracket can
be unbolted and removed from the hub
carrier.
Overhaul
8Brush away all external dirt and dust, but
take care not to inhale any dust as it may be
injurious to health.
9Pull the dust-excluding rubber seal from the
end of the piston.
10Apply air pressure to the fluid inlet union,
and eject the piston. Only low air pressure is
required for this, such as is produced by a
foot-operated tyre pump. Position a thin piece
of wood between the piston and caliper body
to prevent damage to the end face of the
piston in the event of its being ejected
suddenly.
11Using a suitable pointed instrument, prise
the piston seal from the groove in the cylinder
bore. Take care not to scratch the surface of
the bore.
12Clean the piston and caliper body with
methylated spirit and allow to dry. Examine
the surfaces of the piston and cylinder bore
for wear, damage and corrosion. If the piston
surface alone is unserviceable, a new piston
must be obtained, along with seals. If the
cylinder bore is unserviceable, the complete
caliper must be renewed. The seals must be
renewed regardless of the condition of the
other components.
13Coat the piston and seals with clean
brake fluid, then manipulate the piston seal
into the groove in the cylinder bore.
14Push the piston squarely into its bore.
15Fit the dust-excluding rubber seal
between the piston and caliper, then depress
the piston fully.
Refitting
16Refit the caliper and where applicable the
carrier bracket by reversing the removal
operations. Tighten the mounting bolts to the
specified torque.17On P100 models, when refitting the
roadwheel align the previously made marks
on the roadwheel and wheel stud.18On completion, bleed the front brake
circuit.
Braking system 10•9
10
6.6 Exploded view of Teves front disc caliper
A Guide bolts
B Caliper carrier bracket
C Caliper retaining clipD Disc pads
E Dust-excluding seal
F Piston sealG Piston
H Caliper
6.5 Exploded view of Girling front disc caliper
A Caliper
B Guide pin and dust
bootC Piston seal
D Piston
E Dust-excluding sealF Disc pads
G Caliper carrier bracket