32 11... Notes on checking steering backlash on vehicles with rack-and-pinion steering (with front axle raised)

WARNING: This page is about a different car, the 2010 BMW 550i, 2009 BMW 550i, and 2008 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: When the front axle is raised, the applied force is distributed via the tie rod into horizontal and vertical forces. If there is now no electric or hydraulic assistance, the forces created cause the thrust member (1) to be unloaded against the spring (2). The play created in this way is incorrectly referred to as steering backlash.

3 = Rack

Fig 1: Identifying Thrust Member

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Target state: steering must be free from play in all the mechanical components (except for steering gear and tie rod)!

NOTE: For checking purposes, the steering gear must be pressurized by means of electric or hydraulic assistance.

Hydraulic steering assistance: Start engine
Electro-hydraulic steering assistance: Switch ignition on
Electric steering assistance: Switch ignition on