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Removal & Installation

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  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. Unfasten plug connection (1) and disconnect. Release screw (2). Lift preboost pump (3) out of rubber mount. See Fig 1.
Fig 1: Removing Preboost Pump
G00148407Courtesy of BMW OF NORTH AMERICA, INC.
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