Brake Booster -NX6-, Removing And Installing: Removing

WARNING: This page is about a different car, the 2022 Volkswagen ID.4 and 2021 Volkswagen ID.4. However, it is still accessible from the selected car via links, so may be relevant.

If the Brake Booster Control Module -J539- is being replaced, then the test plan for replacing the control module must be performed.

-- Perform the "Control module, replacing" function with the Vehicle Diagnostic Tester. Refer to Diagnostic Entries .

Continuation

-- Remove the air intake manifold for the heating and A/C unit. Refer to HEATER AND A/C UNIT AIR INTAKE HOUSING, REMOVING AND INSTALLING .

-- Remove the battery tray. Refer to BATTERY TRAY, REMOVING AND INSTALLING .

-- Extract as much brake fluid as possible from the brake fluid reservoir -1- using the Brake Filling and Bleeding Equipment: VAS6860US -A-.

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-- Disconnect the connectors -2- from the Brake Fluid Level Warning Switch -F34- and -3- from the brake booster -1-.

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CAUTION:

There is risk of damage caused by corrosion.

- Make sure no brake fluid gets on the contacts.

- Place enough lint-free cleaning cloths in the brake booster area.

-- Remove the brake lines -2 and 3- on the brake master cylinder.

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-- Immediately close the threaded holes at the brake master cylinder using the plugs from the assembly part set M12.

-- Seal the brake lines with the Engine Bung Set: VAS6122 .

Tip

Alternatively, place the breather valve dust caps on the brake lines.

-- Refer to Brake Pedal, Disconnecting from Brake Booster .

-- Remove the nuts -3 and 4- for the brake booster at the mounting bracket.

Fig 1: Brake Pedal Tightening Sequence

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CAUTION:

There is a risk of damaging the bulkhead by incorrectly loosening the bonded joint.

- Never pry on the bonded joint between the brake booster and the bulkhead.

-- If the brake booster gets caught in the holes, remove both nuts -1 and 2- from the mounting bracket.

-- Remove the brake booster from the bulkhead and guide out the vehicle.

Conditions

Pay attention that the brake master cylinder brake lines are not bent.

-- Remove the adhesive residue -arrows- from the brake booster -2- and the bulkhead -1-.

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-- Use the Wiring Harness Repair Set - Hot Air Blower: VAS1978/14A , warm up and remove the adhesive residue on low heat.

-- Clean the surfaces thoroughly.