Necessary preliminary tasks

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Remove WHEELS .

Checking thickness difference:

Measure thickness difference within brake surfaces at 8 point (spread over the circumference) with a micrometer gauge
Compare measurement result with SETPOINT VALUE

Fig 1: Measuring Brake Surface Thickness Using Micrometer Gauge

Courtesy of BMW OF NORTH AMERICA, INC.

Check minimum brake disc thickness:

Position special tool 34 1 280 at three measuring points in area (1) and measure.
Compare measurement result and lowest value with SETPOINT VALUE

Fig 2: Positioning Special Tool (34 1 280) At Three Measuring Points

Courtesy of BMW OF NORTH AMERICA, INC.