Brake Fluid Reservoir: Removing

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-- Remove the plenum chamber cover, refer to PLENUM CHAMBER COVER, REMOVING AND INSTALLING .

-- Disconnect the connector from the brake fluid level warning switch -F34-.

-- Remove the brake fluid reservoir cover over the brake fluid reservoir BRAKE FLUID RESERVOIR COVER .

-- To protect against escaping brake fluid, place enough lint-free cloths in the area below the master brake cylinder.

-- Extract as much brake fluid as possible from the brake fluid reservoir with the brake charger/bleeder unit VAS 5234 and adapter VAS 5234/1.

-- With manual transmissions, remove the clutch hydraulic line -5- from the brake fluid reservoir and seal it.

Fig 1: Identifying Brake Master Cylinder Components

Courtesy of AUDI OF AMERICA, LLC

WARNING:

Brake fluid must never come into contact with fluids containing mineral oils (oil, gas, cleaning solutions). Mineral oil damages the sealing plugs and boots of the brake system.
Brake fluid is poisonous. NEVER siphon brake fluid with your mouth! Also due to its corrosive effect, brake fluid must not come into contact with paintwork.
Observe disposal regulations.

-- Pull the lower locking pin out of the brake fluid reservoir.

-- Remove the brake fluid reservoir from the brake master cylinder.