The hydraulic system:

Main menu hydraulics The complete hydraulic system The Brake system The height control system The fluid pressure control The hydraulic diagrams

The brake system:

Introduction Diagnostics table Conjunction of components Components:    Brake calipers    Brake distribution valve      Brake pressure limiting valve    Master cylinder

The Brake pressure limiting valve

In the next animation two drawings illustrate the working of the brake pressure limiting valve (deceleration conscious pressure limiting valve). This brake pressure limiting valve is the fore runner of the anti-block brake system (ABS).
For a view on each separate drawing you can go to the bottom of this page.

The next drawing shows the brake pressure limiting valve again but now provided with some explanations:

The deceleration conscious pressure limiting valve is fitted in the brake actuation box together with the master cylinder. This valve shuts off the hydraulic fluid that is heading for the upper set of pistons of the rear brake callipers in case of an emergency stop. The valve is mounted on the bracket with the front upwards. Inside the valve a detent ball is held down by gravity. Ones the brakes are firmly operated the ball will move upwards cutting off one of the brake pipes. Two of the four rear piston sets are no longer activated which will reduce the brake power. In that way the rear wheels won't block, which prevents the car from skidding. In fact it is a kind of ABS system. A remarkable fact is that this valve is still applied in the brake system on the later models like the Spur and Spirit.

A cut-away drawing of the brake pressure limiting valve (left) and a drawing of the valve when watching them from the bottom at the left side of the engine:

The animated drawing at the top of this page is built-up with the next drawings.

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