34 00... Checking brake discs

WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. However, it is still accessible from the selected car via links, so may be relevant.

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 - TECHNICAL DATA or REAR BRAKE - TECHNICAL DATA .

Fig 1: Checking Thickness Difference 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 - TECHNICAL DATA or REAR BRAKE - TECHNICAL DATA .

Fig 2: Positioning Special Tool (34 1 280) At Three Measuring Points
Courtesy of BMW OF NORTH AMERICA, INC.