Test Values/Wear Limits

Information

The following condition criteria can make replacement necessary depending on the wear of the PCCB brake discs:

Surface changes in the brake disc friction surfaces at an advanced stage.
Minimum brake disc thickness is not retained due to wear (material erosion due to friction).

Location	Description	Type	Basic value
Pad thickness, front	All	Measured value	9.4 mm
Pad thickness, front (wear limit)	All	Measured value	2 mm
Pad thickness, rear	All	Measured value	11.2 mm
Pad thickness, rear (wear limit)	All	Measured value	2 mm
Brake disc thickness, new (front)	All	Measured value	34 mm
Brake disc thickness, new (rear)	All	Measured value	28 mm
Brake disc wear limit, front	Minimum brake disc thickness (wear limit) is stamped on the brake disc hub. Example: Min. Th. 33.7 mm	Measured value	(Read off value on brake disc hub) X.XX mm
Brake disc wear limit, rear	Minimum brake disc thickness (wear limit) is stamped on the brake disc hub. Example: Min. Th. 27.7 mm	Measured value	(Read off value on brake disc hub) X.XX mm
Wear limit: Surface changes in front and rear brake discs	Wear limit: Connected surface fracture > 1 cm² and/or surface roughness of brake disc > 80 micrometer. Replace PCCB brake discs on both sides of the axle.	Surface changes	Values and procedure for: 46 51 02 Checking PCCB brake discs/46 54 02 Checking rear PCCB brake discs.
Thickness tolerance of brake discs (max.)	All	Measured value	0.02 mm
Lateral runout of brake disc (max.)	All	Measured value	0.03 mm
Lateral runout of wheel hub (max.)	All	Measured value	0.03 mm
Lateral runout of brake disc when installed (max.)	All	Measured value	0.06 mm
Push rod play	Measured at brake pedal plate	Measured value	approx. 1 mm
Diameter of parking-brake drum	Parking brake (electrically actuated, drum brake acting on the rear axle)	Diameter	180 mm
Diameter of parking-brake drum (wear limit)	All	Diameter	181 mm
Width of parking-brake shoe	All	Measured value	24 mm