A doseur valve (sometimes known as a doser valve), plays a key part in a vehicle’s hydraulic braking system. Its job is to send brake fluid, which has been converted in to hydraulic pressure to the vehicle’s brakes.
The doseur valve is located by a LMH reservoir which holds hydraulic fluid. The doseur valve goes in to operation when the brake pedal is pressed by sending the pressurised hydraulic fluid from the reservoir to the brake lines. The level of pressure is crucial in ensuring that the brakes work. Too little pressure and the brakes will fail.
It’s also key that there is no air in the system. This will result in a delay between the pressing of the brakes and the brakes working, which could be fatal. Any delay in the activation of brakes should be immediately checked by a reputable garage.
Other signs of a doseur valve failure could include the vehicle leaking hydraulic fluid. This green coloured liquid may be seen on the ground under the vehicle. You may also see a lit warning light on your dashboard to tell you that there is an issue with your vehicle’s braking system.