beautypg.com

Fault finding - braking system – FIAT Uno 45 User Manual

Page 89

background image

locknut and turn the adjuster nut on the
handbrake primary rod (photo).
3 Raise the rear roadwheels and check that
they turn freely when the handbrake lever is
fully released.

17 Handbrake cable -

renewal

1

1 There are two cables, either of which may
be renewed independently
2 Disconnect the cable, which is to be renewed,
from the shoe lever at the brake backplate.
3 Disconnect the longer cable from the
primary link or rod and release the cable from
its retainers. On later models with a plastic
fuel tank, a cable bracket is moulded into the
side of the tank (photo).

4 Disconnect the shorter cable from the pivot
lever at the pulley on the rear axle (photo).
5 Refit the new cables by reversing the
removal operations and then adjust as
described in the preceding Section.

18 Brake pedal -

removal and refitting

1

1 The operations are described in
conjunction with the clutch pedal in Chapter
5, Section 4.
2 The brake pedal pushrod will slide out of
the servo unit as the pedal is withdrawn.

19 Stop lamp switch

1

1 The brake stop lamp switch is of plunger
type acting on the pedal arm.
2 Adjust the position of the switch by turning
the locknuts until the stop lamps illuminate
when the pedal arm is depressed through 1.0
mm (0.039 in).

Braking system 8•9

Fig. 8.13 Handbrake components (Sec 17)

17.4 Handbrake cable pulley

17.3 Handbrake cable guide on fuel tank

8

Fault finding - braking system

Excessive pedal travel

Pads or shoes excessively worn

Incorrect pedal or servo pushrod adjustment

Automatic adjusters faulty

Seized wheel cylinder or caliper piston

Master cylinder seals worn

Pedal feels spongy or soggy

Air in hydraulic system

Low fluid level

Loose connections

Flexible hose perished

Defective wheel cylinder or caliper seal

Pedal feels springy

New pads or linings not bedded-in

Master cylinder mounting loose

Pedal vibrates when brakes applied

Discs or drums distorted

Friction linings excessively worn

Loose backplate or caliper mounting bolts

Wear in steering or suspension components

Excessive effort required to stop car

Worn or contaminated linings or pads

Incorrect grade of lining or pad material

Servo vacuum hose leaking or disconnected

Faulty servo or non-return valve (55 or 70 models)

Seized caliper or wheel cylinder piston

One circuit defective on dual circuit hydraulic system

Brakes pull to one side

Friction linings contaminated on one side of car

Seized hydraulic piston on one side of car

Different types of linings fitted on different sides of car, or new
linings on one side only

Seized automatic adjuster on one side of car

Brakes drag

Handbrake linkage overadjusted or seized

Seized caliper or wheel cylinder piston

Brakes squeal

Drums or discs rusty or damp (temporary fault - no action
necessary)

Dust or grit in brake drums

Linings excessively worn

This manual is related to the following products: