Normal Operation and Fault Conditions
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
Some vehicles are equipped with a camshaft driven vacuum pump to supply vacuum to the brake booster. All other engines use the vacuum generated by engine operation to supply vacuum to the brake booster.
The ABS module uses a vacuum sensor to monitor the brake booster vacuum. The vacuum pump is expected to produce at least 600 mBar (18 In-Hg). A leak in a vacuum hose, brake booster or one of the seals on the brake booster or vacuum pump prevents the brake booster from achieving the required amount of vacuum. Damage or and internal failure prevents the vacuum pump or the engine from operating at peak capacity.