i have a renault megane scenic (r reg) underneath the car at the rear in between the back wheels there is a metal box with four brake lines coming out of it and a spring connected to a rod which is fixed to the bottom of the car the spring is not tight its just spinning around it looks like some kind of hydraulic contraption i am trying to find out the name of it and what its usage is please can you help ps the car is a 1600 petrol renault megane scenic

stephen, August 2007

its a load sensing valve. its job is to adjust pressure to rear brakes under differing load conditions.

k, August 2007

Hi.its the brake compensator.
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Richard, August 2007