34 21 Rear Brake Discs E89

WARNING: This page is about a different car, the 2016 BMW Z4, 2015 BMW Z4, and 2014 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

REAR BRAKE DISCS SPECIFICATION

IMPORTANT: Installation of new brake pads is approved only provided that the brake disc thickness exceeds the specified dimension for "MIN TH" (see table). Brake discs must be replaced when they reach the nominal thickness (see table) minus 2.4 mm!(Not applicable to perforated brake discs and M vehicles).Applies only to M vehicles and perforated ventilated brake discs:The brake discs must be replaced once they wear to the nominal specified thickness (see table) minus 1.6 mm!Depending on: Engine type Transmission version Equipment specification (e.g. maximum load increase, chassis official-use, national version, etc.) different brake discs can be fittedThe brake discs must always be assigned by way of the relevant vehicle identification number and the Electronic Parts Catalogue!
Different thicknesses on brake linings	Max. mm	0.01
Nominal size (diameter x thickness)	mm	324x20
Nominal size (diameter x thickness)	mm	300x20
(MIN TH) is stamped in brake disc chamber	mm	18.4
Wear warning from residual lining thickness	mm	3.7