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Brake Biasing Valve - MarcleLeisure.co.uk

The above picture shows the rear axle of a Peugeot Boxer / Fiat Ducato / Citroen Relay.

Earlier vehicles have the brake load sensor valve mounted behind the axle

The photo was taken from in front of the off-side rear  wheel, looking towards the nearside wheel. The front of the vehicle is to the right.

A Brake Load Sensor Valve (LSV) lever located on to the rear axle. This is the place where adjustments are made to increase or decrease braking capacity to the rear wheels
B Flexible brake hose down to the axle
C Steel brake pipe from valve to flexible hose
D Brake biasing valve which will have two steel brake pipes running to it plus a lever
E Brake biasing valve lever (operating rod)

The above shows the position of a brake load sensor valve (LSV) which is not fitted to vehicles which have ABS brakes. The purpose of the LSV is to reduce the braking capacity to the rear axle when there is no load in the rear of the vehicle. Basically the higher the body, the less braking capacity is applied to the rear axle.

The reason for fitting the LSV is to stop the rear wheels locking up when there is no load over the rear when, so preventing what is in effect a handbrake turn where the rear of the vehicle flips round on you.

If the vehicle has not got a LSV, then it's almost likely to have ABS brakes


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