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. See FRONT BRAKE SPECIFICATIONS or REAR BRAKE SPECIFICATIONS .

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 SPECIFICATIONS or REAR BRAKE SPECIFICATIONS .
  Fig 2: Checking Minimum Brake Disc Thickness

  Courtesy of BMW OF NORTH AMERICA, INC.