Audi Q3: Brake Master Cylinder, Removing and Installing

Special tools and workshop equipment required

• Brake Charger/Bleeder Unit -VAS5234-
• Sealing plugs from Repair Kit -1H0 698 311 A-

Removing

- Remove the brake fluid reservoir, refer to → Chapter "Brake Fluid Reservoir, Removing and Installing".

- Disconnect the connector -1- from the Brake Lamp Switch -F-/Brake Pedal Switch -F63-.

  Note

Ignore item -2-.

Audi RS Q3:

- Remove the bolts -arrows- and remove the bracket -1- for the air filter housing.

Continuation for All Vehicles:

- Open the bracket for the wiring guide -arrows- and push the wires aside.

- Remove the wiring guide.

- Extract as much brake fluid as possible from the brake fluid reservoir with the Brake Charger/Bleeder Unit -VAS5234-.

  Note

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

- Remove the union bolts -arrows- and remove the brake lines.

- Immediately seal off the brake lines and the threaded holes with the plugs from Repair Kit -1H0 698 311 A-.

- Remove the nuts -2-.

- If necessary, remove the heat shield with retaining plate.

- Remove brake master cylinder from brake booster.

  Note

Ignore item -1-.

Installing

Install in reverse order of removal. Note the following:

  Note

Replace the seal between the brake master cylinder and brake booster.

- When inserting the brake master cylinder, make sure the push rod is seated correctly in the brake booster.

- Press brake pedal down a bit, this allows the brake master cylinder to be guided into pressure rod more easily.

- Bleed the brake system, refer to → Chapter "Hydraulic System, Bleeding".

- Bleed the clutch mechanism, refer to → Rep. Gr.30; Clutch Mechanism; Clutch Mechanism, Bleeding.

  WARNING

Risk of accident!

Make sure the brakes are working correctly before driving the vehicle.

Brake Fluid Reservoir, Removing and Installing

Special tools and workshop equipment required

• Hose Clamps - Up To 25mm -3094-
• Brake Charger/Bleeder Unit -VAS5234- with Brake Bleeder Adapter -VAS5234/1-

Removing

- Extract as much brake fluid as possible from the brake fluid reservoir with the Brake Charger/Bleeder Unit -VAS5234-.

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

Audi Q3:

- Remove the battery and the battery tray, refer to → Electrical Equipment; Rep. Gr.27; Battery; Battery Tray, Removing and Installing.

  Note

Place a cloth underneath to catch any brake fluid leaking out.

- For vehicles with a manual transmission, remove the return hose -1- to the clutch master cylinder.

- Release the left and right retainers -2- in direction of -arrow- and pull the brake fluid reservoir upward out of the sealing plugs.

Audi RS Q3:

- Remove the air filter housing, refer to → Engine Mechanical, Fuel Injection and Ignition; Rep. Gr.24; Air Filter; Air Filter Housing, Removing and Installing.

- Remove the stud bolt -arrow- and remove the brake fluid reservoir -1- upward from the sealing plugs.

  Note

Ignore item -2-.

Installing

Install in reverse order of removal. Note the following:

- Bleed the brake system, refer to → Chapter "Hydraulic System, Bleeding".

  WARNING

Risk of accident!

Make sure the brakes are working correctly before driving the vehicle.

Tightening Specifications

• Air guide pipe, refer to → Rep. Gr.24; Air Filter; Overview - Air Filter Housing.
• Battery tray and battery, refer to → Electrical Equipment; Rep. Gr.27; Battery; Overview - Battery.

READ NEXT: