Brake master cylinder, removing and installing
Special tools, testers and auxiliary items required
- Brake filler/bleeder unit VAS 5234
- Sealing plugs repair kit part no. 1H0 698 311A
Removing
- Remove plenum chamber cover
Extract brake fluid using brake filler/bleeder unit VAS 5234
- Open brake fluid reservoir.
- To protect against escaping brake fluid, place a lint-free rag in area under brake master cylinder.
- Extract as much brake fluid as possible from brake fluid reservoir using brake filler/bleeder unit VAS 5234.
- Disconnect float warning indicator sensor - 1 - connector.
Tower brace, removing
- Remove cylinder combi-bolt - 1 - , tightening torque 45 Nm
- Remove cylinder combi-bolt - 2 - , tightening torque 3 Nm
- Item - 3 - front part of plenum chamber
- Item - 4 - suspension strut mounting socket
- Arrow - on illustration points in direction of travel.
Fig 6: Cylinder Combi-Bolts, Suspension Strut Socket Cross Brace, Front Window Cross Brace & Window Cross Brace Connecting Piece Support
- Remove cylinder combi-bolt - 1 - , tightening torque 9 Nm
- Item - 2 - suspension strut socket cross brace
- Item - 3 - front window cross brace
- Item - 4 - window cross brace connecting piece support
- Remove brake fluid reservoir bolt - 1 -.
- Remove brake fluid reservoir sideways.
NOTE:
- Protect plenum chamber from escaping brake fluid.
- Brake fluid reservoir is engage in master brake cylinder on bottom side.
- To remove reservoir, press locking tab down and at the same time, remove brake fluid reservoir from sealing plugs.
- Remove brake lines - 2 - and seal off with plugs from repair kit part no. 1H0 698 311 A.
- Remove brake master cylinder bolts - 3 -.
- Carefully take brake master cylinder out of brake booster.
Installing
When installing, observe the following:
- Before installing brake booster, clean plenum chamber of remaining escaping brake fluid.
- When installing together the brake master cylinder and brake booster, make sure push rod is correctly located in brake master cylinder.
- Adjust brake light switch → Brake light switch, removing and installing .
- Bleed brake system → Bleeding braking system .