TIAGO

BRAKES

INTRODUCTION

Dual circuit, diagonal split vacuum assisted

hydraulic brakes through tandem master cylinder

have been provided on TIAGO. The front brakes

are ventilated disc brakes with floating type

calipers while the rear brakes are drum brakes with

self-shoe clearance (automatic) adjustment. No

adjustments are required for front & rear brakes.

The parking brake is a mechanical lever type,

(cable operated) acting on rear wheels.

In addition to the conventional hydraulic brake

system, an Anti-lock Braking System (ABS)

incorporating Electronic Brake Force Distribution

(EBD) is also provided.

During a normal braking event EBD replaces the

pressure conscious regulating valve (PCRV) and

limits the level of braking force transmitted to the

rear wheels. The advantage of EBD over a PCRV

is that it can moderate the braking forces at the

rear depending upon the load condition and

available friction at the rear wheels.

During an emergency braking event the ABS

modulates the braking force for each individual

wheel. In doing so the system optimizes the level

of braking being achieved while maintaining a

stable, controllable vehicle. Where EBD only acts

on the rear wheels the ABS is able to control each

wheel individually and can facilitate pressure hold,

release and increase cycles.

Both the EBD and the ABS functions work by

continuously monitoring and comparing the four

individual wheel speeds and reacting to when a

wheel is detected as loosing grip with the road

surface.

The ABS is designed to be incorporated into the

circuits of the foundation brake system, and will not

prevent the normal hydraulic operation of the

brakes in the event of an ABS failure.