Genuine Audi TT Brake Booster

The Brake Booster is a power-assist device found between the brake pedal linkage and master cylinder that helps multiply the force exerted by the driver and therefore slows down the vehicle with less effort. The Audi Brake Booster comprises a diaphragm and power piston inside a two-part metal shell. The master cylinder bolts to the front half, while a pushrod from the pedal enters the rear half. In the Audi braking layout, when the brakes are at rest, engine-supplied vacuum fills both chambers, holding the diaphragm in a neutral position. Push the pedal to open an internal valve that allows atmospheric air to enter the rear chamber while the vacuum stays in the front. This causes a pressure difference and thrusts the piston forward and drives the master cylinder with even more force. This is common to many Audi models. Once the pedal is released, both sides of the system develop a vacuum and the piston will return to the resting position as will the pedal. Due to the dependence of the Brake Booster on the manifold vacuum, full assistance is provided only while the engine is running. However, a small stored vacuum reserve allows a limited number of assisted stops after the engine is switched off. Accordingly, the driver uses less pedal effort, reducing both fatigue and overall system volume. The vacuum servo arrangement specified by Audi for TT production provides controlled hydraulic pressure to both wheels without requiring excessive leg effort. The Brake Booster does not have any friction surfaces and is generally durable, but the loss of vacuum or damage to the internal diaphragm can lessen assistance and lengthen stopping distances. Audi combines this element with the master cylinder and pedal geometry to ensure that braking response is balanced with the overall TT chassis tuning.

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