Branding load proportioning valve

BRANDING LOAD PROPORTIONING VALVE

(from chassis no.6023216 to chassis no.___)

DESCRIPTION

The braking load proportioning valve is assembled in the same way as the previous one, but it is without the control spring; since the operating procedure depends on the pressure in the braking circuit and not on the position of the suspension.

In fact, up to a pressure in the circuit of 42 kg/cm, the output pressure (Pu) equals the inlet pressure (Pe).

The further increase of inlet pressure, acting on the surfaces of the piston inside the proportioning valve, determines a reduction in the growth of the outlet pressure as shown below.

Therefore the proportioning valve needs no adjustment and it is fastened by two screws in the same housing as the previous version.

REMOVING/REFITTING

• Set the car on a lift.
• Drain the brake/clutch fluid reservoir.
• Remove the rear section of the exhaust piping (see Group 10).

1. Slacken the stiff pipe fittings from the braking load proportioning valve.
2. Slacken the two fastening screws and remove the braking load proportioning valve.

When refitting, relieve the air from the braking system (see specific paragraph).

WARNING: From chassis no.... the braking load proportioning valve is NOT present on cars fitted with BOSCH 5.3 ABS system with EBD as the rear axle brake distributing function is controlled by the ABS system itself.

BRAKE SYSTEM PIPES

CHECKS AND INSPECTIONS

• Check the stiff pipes and hoses for cracks, swellings, rust and fluid leaks.
• When changing the pipes, empty the brake-clutch fluid reservoir using a syringe and plug the ends of the actual pipes to prevent foreign substances from getting in.
• When refitting fill the brake-clutch fluid reservoir and bleed the air from the brake system (see specific paragraph).

The stiff pipes must never be bent or twisted.