BRAKES
M8540Narrow, M9540Narrow, WSM
N5-S10
Brake Plate Wear
1. Measure the brake plate thickness with vernier calipers.
2. If the measurement is less than the allowable limit, replace it.
9Y1210236BRS0020US0
Brake Piston Flatness
1. Place the brake piston on flat surface (surface plate) and
determine if a 0.3 mm (0.012 in.) feeler gauge will fit
underneath.
2. Check this at four points on a diagonal line.
3. If it will fit, grind in a circular motion with sandpaper or replace it.
4. Inspect the sliding portion of the brake piston and brake case
interior. If damage or wear is found, replace it.
9Y1210236BRS0021US0
Brake plate wear
Factory specification
2.1 to 2.5 mm
0.0827 to 0.0984 in.
Allowable limit
1.5 mm
0.059 in.
Brake piston flatness Allowable limit
0.3 mm
0.012 in.
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