[LACA335i]

this is BMW ALigement procedure. (EVerything is calculating into pre aligement that include ride heigh and tire, bend parts on the suspension)

Alignment Procedures
The following procedure is an outline to follow based on BMW procedures. The actual
alignment procedures will vary depending upon the alignment equipment being used. Refer
to the alignment equipment manufacturers procedures for specific information. The steps
listed below should be followed as closely as possible to perform a quality alignment.
• Vehicle Inspection - The vehicle inspection should include a road test before and
after the alignment. Note any concerns during the pre-alignment road test and verify
that the concern has been rectified during the post-alignment road test.
• Install Specified Weight - Check Group 32 Technical Data in TIS to determine the
“Normal Position/ Inspection Conditions”. Install Specified weight in vehicle and
compensate for fuel by adding extra weight if needed.
• Install Alignment Sensors - Install alignment sensors as per the alignment equipment
manufacturers recommended procedures.
• Compensate Sensors - Depending upon the alignment sensors being used, compensation
may not be necessary. Compensation may require the vehicle to be lifted
from the alignment rack. If so, be sure to remove the pins from the front and rear
slip plates. If the sensors do not need to be compensated, the next step can be
ignored.
• Lower Vehicle and Jounce - Make sure the pins are removed from the slip plates.
Lower the vehicle back onto the alignment rack and jounce the vehicle. This will
insure that the suspension has settled.
• Check Ride Height - Check ride height using metric tape measure. Ride height
specifications can be found in Technical Data in TIS. Front ride height specs can be
found under group 31 and rear can be found under group 33. Always check ride
height after compensating the sensors. This will avoid having to check the ride
height twice.
• Perform Alignment - There and various types of alignment equipment used in
BMW workshops. Refer to the equipment manufacturers instructions for the next
steps of the alignment.
When performing an alignment of a vehicle equipped with air suspension (EHC), disable the
system by removing the fuse for the air supply system. This will insure that the ride height
will stay consistent.
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Suspension Systems
Vehicle Inspection
Before attempting to align any vehicle, it is important to inspect the vehicle completely to
insure there are no damaged or loose suspension components. Regardless of the age or
mileage of the vehicle, a complete inspection should be performed. The following items
should be checked thoroughly:
• Tires and Wheels - Check tires for wear patterns that could indicate suspension
problems. Make sure the tires are the correct size and type. Check for the correct
inflation pressures. Look for wheel/rim damage which could indicate impact damage.
• Wheel bearings - Check to make sure there is no excessive wheel bearing play.
This needs to be addressed for safety reasons, but loose wheel bearings will affect
the quality of the alignment as well.
• Steering Linkage- Check the tie rods, center link, idler arm and pitman arm. On
vehicles with rack and pinion steering, check for loose inner/outer tie rods etc.
On vehicles with a center link, make sure the center link is level (see BMW TIS Repair
Instructions). Check flexible coupling between steering shaft and rack and pinion
assembly (or steering box).
• Suspension Components - Check Struts/Shocks for leakage or damage. Check
springs and perform ride height measurements.
• Subframe - Check the front and rear axle carriers. Look for bent/twisted sub
frames. Check the crossmembers for evidence of shifting or displacement. Check
the mounting bolts for “clean spots” which could indicate shifting or movement.
• Brakes - Check braking system by road testing the vehicle. A road test could help
to identify brake related issues such as pulling or brake induced vibrations.
• Drivetrain - While road testing the vehicle, observe and vibrations and/or noises
and try to isolate the cause. Noises and vibrations under acceleration (rather than
coasting) may be an indication of drivetrain issues.
Road Testing
Whenever possible,