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DSC3 Pre-Boost Pump (Except M3): Removal

WARNING: This page does not describe the selected car, but rather 34 other vehicles, including the 2004 BMW M3, 2004 BMW 330xi, 2004 BMW 330i, 2004 BMW 330Ci, and 2004 BMW 325xi. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn toggle (1) through approximately 90 degrees and remove microfilter cover (2) towards front. See Figure.
  2. Remove microfilter element (1). See Figure.
  3. Unclip retainers (1) and feed cable out of cable duct. See Figure.
  4. Release screws (1) and remove microfilter housing towards front. See Figure.
  5. Detach rubber strip (1). Release locks (2) and pull side trim forwards a little. See Figure.
  6. Remove screws (1 and 2) and lift out heater bulkhead. See Figure.
  7. Remove brake master cylinder. See MASTER CYLINDER .
  8. Remove vacuum line and B+ line from assembly compartment partition wall. Turn fasteners (1) through 90 degrees and thus unlock. Remove assembly compartment partition wall (2) towards top. See Figure.
  9. Remove union nuts (1 and 2), unlock and disconnect plug connection. See Fig 1.
  10. Unlock plug (1) and remove from retainer. Remove pre-boost pump (4) in direction (2) and free it from rubber mount. Remove pre-boost pump (4) in direction (3) from bracket (5). See Fig 2.
Fig 1: Locating Union Nuts & Plug Connection
G00148409Courtesy of BMW OF NORTH AMERICA, INC.
Fig 2: Removing Pre-Boost Pump
G00148410Courtesy of BMW OF NORTH AMERICA, INC.
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