Brake Booster
WARNING: This page is about a different car, the 2020 Jaguar XE and 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.
The brake booster gives a boost ratio of 7.5: 1 to the effort applied to the brake pedal. The brake booster is attached to the driver side of the engine compartment bulkhead with a gasket, two studs and nuts.
The input push rod within the brake booster is connected to the brake pedal. The output rod locates in the primary piston of the brake master cylinder.