Brake Master Cylinder, Removing And Installing, With Vacuum Brake Master Cylinder: Installing

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Audi SQ5, 2024 Audi Q5 e, 2024 Audi Q5, 2023 Audi SQ5, and 2023 Audi Q5 e. However, it is still accessible from the selected car via links, so may be relevant.

Install in the reverse order of removal while noting the following:

Replace the seal after removal.
Do not let any brake fluid run into the brake booster.
The actuator pin -item 19- OVERVIEW - BRAKE BOOSTER/BRAKE MASTER CYLINDER, VACUUM BRAKE BOOSTER for the brake lamp switch must be inserted in the brake master cylinder.

-- When inserting the brake master cylinder -1-, make sure that the pressure rod -3- is seated correctly in the brake booster -2-.

Courtesy of AUDI

-- If necessary, have a second technician press the brake pedal slightly. This allows the brake master cylinder to be guided into pressure rod more easily.

-- Install the brake fluid reservoir. Refer to BRAKE FLUID RESERVOIR, REMOVING AND INSTALLING .

-- Remove the plenum chamber bulkhead. Refer to PLENUM CHAMBER BULKHEAD, REMOVING AND INSTALLING .

-- Fill the brake fluid reservoir up to the "MIN" mark (example illustration).

Fig 1: Brake Fluid Reservoir

Courtesy of AUDI

-- Remove all cloths from the vehicle that were previously placed down.

-- Bleed the brake system. Refer to HYDRAULIC SYSTEM, BLEEDING .