General procedure for suspension alignment

In order to exclude erroneous measurements, the following preconditions must be met before alignment and the following points should be given special attention:

• Empty weight of vehicle in accordance with DIN 70020, i.e. car ready for the road, with full fuel tank, spare wheel (collapsible wheel) and tools.
• Ball-joint and wheel-bearing play in order (wheel-bearing play cannot be adjusted).
• tire pressure in accordance with regulations, fairly uniform tire tread.
• Quick-clamping holder for the 911 Turbo with adapter (for the measured-value pickups) correctly secured to the wheels.
• Receiving surfaces for the quick-clamping holder on the wheels and the adapter surfaces must be clean and flat. Always check the levelling surface on the wheels precisely in particular before fitting the quick-clamping holders.
• Strictly comply with maintenance intervals for measuring equipment and measuring platform. If the levelling of the measuring platform or of the measuring area is done in-house, levelling equipment is required. A hose level is inadequate!
• Skilled handling of measuring equipment and measuring platform.
• Sliding plates with transverse motion (rotary motion) at the rear axle are advisable.
• Observe the Technical Literature of PAG, the manufacturer of the measuring equipment and the manufacturer of the measuring platform.
• Do not treat measured values as a whole, but very critically in regard to driving dynamics, high-speed strength of the tires, tire wear and cost/benefit effects (time required for correction of insubstantial deviations). The toe values are of decisive significance for driving dynamics and tire wear.
• If the vehicle is measured front and rear, check and adjust the wheel alignment values at the rear axle first. Camber values at the front axle apply for the straight-ahead position of the wheels. Steering wheel and steering gear in center position when toe is being adjusted.
• Before wheel alignment values are adjusted at front and rear axles, it is recommended that the vehicle height be checked at the DIN empty weight. Conclusions can then be drawn about wheel alignment values in the event of any suspension alignment that becomes necessary later.