Page 16 - BPW ECO Disc service guide

DISC BRAKE ROTOR AND BRAKE PAD WEAR STATUS

Check the condition of the disc brake rotor:
- every 12 weeks (quarterly) under harsh conditions
- every 26 weeks (twice annually) under normal conditions

Sections A - D in the figure above show the possible conditions of the disc surface:
A Network-type tears = permissible
B Radial cracks up to max 1.5 mm width and depth = permissible
C Uneven disc surface less than 1.5 mm = permissible
D Continuous cracks = not permissible

Technical details of SB 3709 and SB 4309T:
- Disc thickness when new = 45mm
- Minimum permissible disc thickness =37mm
(check with slide gauge)

In case of conditions A, B & C the brake disc can be used until the minimum permissible disc thickness has been reached.

45mm
30mm 37mm

45mm
30mm 37mm

9mm 2mm

11mm

To prevent damage to the brake discs, the brake pads should be replaced when their thickness (excluding the back-
ing plate) is 2 mm or less.
If this instruction is not adhered to, there is a danger that braking performance could be seriously reduced.

The latest generation of BPW disc brake rotors offer the following advantages:
- Increased surface area for effective heat dissipation
- Optimisation of material for improved heat distribution over the surface of the disc
- Venuri contour for improved internal air flow
- Optimally matched friction pairing (Pads / Brake discs)
- Simplified parts provision thanks to uniform brake discs for 0 and 120 offsets

16 SB Knorr Bremse Disc Brake Parts Catalogue 01/2017