LAND ROVER Discovery 3 TDV6, Range Rover Sport TDV6 Diesel
What the hazard is
Vehicle Malfunction
What to do
Contact your local Landrover dealer
Defect
Discovery 3 vehicles LA367110-LA440000 and Range Rover Sport LS929086-LS117000. Oil may migrate from the engine driven vacuum pump and collect in the brake booster. This may cause a progressive loss of brake assistance, resulting in hard brake pedal and increased stopping distances for the same pedal effort. In extreme cases engine oil may migrate from the brake booster to the brake master cylinder which may lead to a loss of one or both of the foundation brake system hydraulic brake circuits. This therefore may lead to increased brake pedal travel, increased stopping distances and, in the event of both primary and secondary brake master cylinder seal failure, a total loss of service brakes. Discovery 3 vehicles LA440001-LA513325 and Range Rover Sport vehicles LS117001-LS215618. Vehicles may experience a temporary sticking of the vacuum non-return valve in the brake assistance vacuum pump mounted on the engine. This can lead to a temporary loss of vacuum assistance on the braking system. This can result in increased pedal efforts after the first 3 or 4 applications of the brake pedal after initial engine start for a period of no more than 60 seconds. The hydraulic braking system itself remains fully functional. Once the valve has unstuck the booster vacuum is immediately restored, full braking assistance is available and the brakes perform normally for the remainder of that drive cycle.