Description

(from chassis no. ......................)

DESCRIPTION

The Bosch 5.3 A.B.S. further optimises compactness (ease of assembly), lightness and reliability. The use of new microhybrid electronic components, optimisation of the flows as a result of the study of the new, more compact shapes of the valve bodies and the reduction of the number of hydraulic components since they are pressed directly onto the valve seat of the nozzles which are previously assembled separately have made it possible to improve the characteristics of the solenoid valves.

The main components of the system are:

• new electronic control unit, more powerful and versatile than the previous ones;
• electrohydraulic control unit (4) which modulates the braking pressure at the brake calipers through eight solenoid valves, two for each wheel;

• four sensors (5) and (9), one for each wheel, which detect the angular rotation speed of the wheels.

The system is completed by:

• the hydraulic system piping;
• a specific wiring loom;
• a switch on the brake pedal (8) for detecting the braking condition;
• a warning light (7), on the check panel.

In addition, under particular diagnosis conditions, the warning light (7), supplies information about the faults memorised by the control unit through a series of coded flashes (see Electric System Diagnosis").

1. Brake fluid reservoir
2. Brake pump
3. Vacuum servobrake
4. Electrohydraulic control unit with electronic control unit incorporated
5. Front wheel rpm sensor
6. Front brakes
7. Failure warning light
8. Stop lights control switch
9. Rear wheel rpm sensor
10. Rear brakes
11. Braking load proportioning valve