34 00... Checking brake discs

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Necessary preliminary tasks:

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. See FRONT BRAKE or REAR BRAKE .

Fig 1: Measuring Thickness Difference Within Brake Surfaces 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. See FRONT BRAKE or REAR BRAKE .

Fig 2: Checking Minimum Brake Disc Thickness
Courtesy of BMW OF NORTH AMERICA, INC.