34 00... Checking brake discs

Special tools required: 

• 34 1 280

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

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.