FRONT AXLE
Front brake calipers
31
REPAIR
NOTE :
if there are any scratches in the caliper
bore, the complete caliper must be replaced.
To do this:
- remove the brake caliper,
- remove the rubber dust cover,
- remove the piston using compressed air,
inserting a wooden block between the caliper
and the piston to prevent damage to the
piston: any trace of damage to the piston skirt
will render it unusable
- remove the seal from the caliper groove using
a flexible rounded edge blade (eg feeler
gauge).
Clean the parts using methylated spirits.
Replace any faulty parts using original parts and
then refit the seal, piston and dust seal.
REMOVAL
In the passenger compartment, fit a pedal press
(limits the amount of brake fluid which will run
out).
Release the brake pipe at the wheel cylinder end.
Remove the brake pads (see previous page).
Remove the two mounting bolts for the caliper on
the stub axle carrier.
Completely release the brake pipe by turning the
caliper.
Check the condition of the pipe and replace it if
necessary.
REFITTING
Fit the pipe onto the caliper.
Remove the pedal press.
To check the correct operation of the caliper
cylinder, slacken the bleed screw and wait for
brake fluid to run out.
Retighten the bleed screw.
Refit the caliper on the stub axle carrier and
tighten the bolts to the recommended torque.
Refit the pads and the wheel cylinder (follow the
method described previously).
Wheel bolts 9
Brake caliper guide bolt 4
Brake caliper mounting bolt 10
TIGHTENING TORQUES (in daN.m)
31-5
83 212
75 564
MECHANICAL ELEMENT CONTROLS
Air filter - Brake servo non-return valve
REPLACING THE AIR FILTER
To replace the air filter (F), the brake servo does
not need to be removed.
Under the pedal mounting, use a screwdriver or a
metal hook to remove the worn filter (F). Cut the
new filter at A (see diagram) and fit it around the
rod, then press it into position, checking that it
fills the complete opening to prevent any non-
filtered air from passing through.
REPLACING THE NON-RETURN VALVE
This operation may be carried out on the vehicle.
REMOVAL
Disconnect the brake servo vacuum inlet pipe.
Pull the non-return valve while twisting it to
release it from the rubber sealing washer.
REFITTING
Check the condition of the rubber sealing washer
and the non-return valve.
Replace any faulty parts.
Refit the assembly into position.
37
91101G74883S
37-5
