Land Rover—Discovery 3 TDV6 vehicles and Range Rover Sport TDV6 vehicles (this recall is an extension of PRA2009/10961)
What are the defects?
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 distance 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.
Temporary sticking of the non-return valve leads to a temporary loss of vacuum assistance on the braking system. The hydraulic braking system itself remains fully functional. Once the valve has unstuck the booster vacuum is immediately restored, full braking asistance is available, and the brakes perform normally for the remainder of that drive cycle.
What are the hazards?
The defect 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.
What should consumers do?
Contact your authorised Land Rover Dealership for rectification.