Brakes - Brake Rotor Minimum Thickness Information
SI M34 01 10
Brakes
June 2011
Technical Service
SUBJECT
Brake Rotor Minimum Thickness
MODEL
All
INFORMATION
MINI brake discs/rotors are stamped with a Minimum Thickness. The stamped minimum thickness is used to determine whether the brake
discs/rotors require replacement during a brake service, such as a pad replacement. However, some motor vehicle inspection procedures require the
measurement of brake discs/rotors. An additional minimum thickness specification for the purpose of motor vehicle inspection is provided in the
Technical Data section of the Repair Manual. Examples of the two specifications are described in this bulletin.
The Stamped Minimum Thickness (MIN TH) is utilized as described below:
New brake pads may only be installed if the brake disc thickness is greater than or equal to the minimum brake disc thickness (MIN TH) (not
including perforated brake discs).
For vehicles fitted with perforated (cross-drilled) brake discs, new brake pads may only be installed if the brake disc thickness is greater than the
stamped minimum thickness (MIN TH).
2002-2006 Mini Cooper (R50) L4-1.6L (W10) Page 34
The Minimum Thickness for general inspection (Motor Vehicle Inspection) is defined as follows:
Nominal size thickness minus 2.4 mm (not including perforated brake discs)
For vehicles fitted with perforated (cross-drilled) brake discs: nominal size thickness minus 1.6 mm
Note:
Nominal size thickness refers to the width of a new rotor.
Always refer to the Repair Manual for model-specific information.
