Yamaha BIG BEAR YFM400S Owner's Manual page 135

Brake lever free play adjustment
1. Loosen the locknut and fully turn in the
adjusting bolt at the brake lever.
1. Locknut 2. Adjusting bolt
2. Turn in the adjusting nut on brake cable
to provide a gap of 0–1 mm (0–0.04 in)
between the camshaft lever and the pin.
1. Adjusting nut (brake cable)
3. Pin
8-26
2. Lever
a. Gap