4.3 Brake wear testing

Pad:

The figure 1 in blue is friction material; the figure 2 in white is steel back.
Permitted wear limit=steel back thickness + residual friction material thickness (minimum 2mm)
The thickness of the new pad:  30mm     
Permitted wear limit :  12mm

Relative requirements for pad using:

1. If there is burn/ polish/crack / oil stain on either side of the friction material of the pad, it should be changed immediately;
2. The pad and the pad retainer should be replaced at the same time;
3. The pads on the same axle should be replaced at the same time.

According to the requirement of part 4.2, measure the thickness of the disc after removing the inner and outer pads.
The initial thickness A of the disc : 45mm
The limit thickness B : 37mm                                        
Jumping Scope :  0.15mm
Maximum thickness gap :  1mm

Disc crack inspection:
A1=crack                                 permitted
B1=maximum radiate crack 0.5mm wide        permitted
C1=unevenness less than 1.5 mm               permitted
D1=radial through crack surface                non- permitted
a=working friction surface

Caution:

1. excessive wear of the friction and disc will lead to failure of braking;       
2. The discs on the same axle should be changed simultaneously. After replacing the new disc, it is recommended to assemble the new pad.