What is a distribution valve?

First, some information about what a brake distribution valve is. A distribution valve is used when a hydraulic handbrake is installed. Ideally, you want to separate the brake circuits for handbrake and footbrake. So unless dual rear calipers are used to get separate brake circuits, a distributor valve is instead used to separate the circuits. The distribution valve is therefore assembled together with the hydraulic handbrake where double rear brake calipers are not used (2 per disc) to separate the footbrake circuit and the hydraulic handbrake circuit. These two circuits are then spliced together through the distribution valve on to the rear brakes. The distribution valve then only lets through the circuit that produces the most power to the rear brakes. If force is applied to both the handbrake and the footbrake circuit at the same time, the circuit with the greatest force will reach the rear brakes.

Distribution valve routing

Connection takes place according to the picture. One Master brake cylinder represents the foot brake circuit and the other the hydraulic hand brake circuit.

These are spliced together with the distribution valve and then on to the rear brakes.

Installation in the car

The distribution valve must be mounted on the prop shaft tunnel or another high position in relation to the rest of the brake system, as the idea is that air should be trapped in the valve in order to be vented through the built-in air bleeder.