32 41 009 Checking operation of power steering vane pump (M model)

WARNING: This page is about a different car, the 2010 BMW M5, 2009 BMW M5, 2008 BMW M5, 2007 BMW M5, and 2006 BMW M5. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

32 4 000 (DEVICE FOR CHECKING PUMP PRESSURE ON HYDRAULIC STEERING)

IMPORTANT: Prior to this check, first check all hose connections, the vane pump and the power steering gear for leaks.
Adhere to the utmost cleanliness. Do not allow any dirt to enter the hydraulic system.

After installation:

Fill and bleed HYDRAULIC SYSTEM
Check pipe connections for leaks

Necessary preliminary tasks:

Draw off and dispose off hydraulic fluid from fluid reservoir Observe country-specific waste-disposal regulations
Remove FRONT WHEEL
Remove REINFORCEMENT PLATE
Remove steering gear cover at side
Disconnect pressure line from power steering gear and expose up to engine

Connecting special tool:

Connect special tool 32 4 000 with new sealing rings to vane pump and pressure line.

Connection, pressure line (vane pump)
Connection, power steering gear

Fig 1: Identifying Special Tool (32 4 000)
Courtesy of BMW OF NORTH AMERICA, INC.

Checking pump pressure:

Close valve (A).
Open valve (B).
Fill and bleed HYDRAULIC SYSTEM
Start engine.
Heat hydraulic fluid to approx. 50 °C by moving steering wheel at increased engine speed.
Close valve (B) for max. 10 secs. and read off pressure.
Compare measured pressure with specified nominal pressure.
Replace vane pump if the nominal pressure is exceeded by more than 10%.

Check belt tension if the nominal pressure is undershot by more than 10%. Replace vane pump if belt tension is OK.

Fig 2: Identifying Special Tool (32 4 000)
Courtesy of BMW OF NORTH AMERICA, INC.