Yamaha DT125E 1977 Owner's Manual page 33

1. Adjuster
CAUTION: Always check whether or not
the brakelight operates correctly after rear
brake adjustment.
Brake lining inspection
The specified thickness of the brake lining
when new is 4 mm. (0.16 in). The lining
should be replaced when the brake lining
material wears to less than 2 mm. (0.079 in)
thickness.
To inspect, remove the plug from the inspec-
tion hole on the brake shoe plate and check
the thickness of the lining. If worn out, ask
your Yamaha dealer to install a new set of
brake shoe. Be sure to replace the plug
properly so water cannot enter the shoe plate.
1. Inspection hole (Front) 1 . Inspection hole (Rear)
Brakelight switch adjustment
The brakelight switch is operated by move-
ment of the brake pedal. To adjust, hold the
main body of the switch so it does not rotate
and turn the adjuster. Proper adjustment is
achieved when the brake starts to take effect
and the brakelight illuminates simultaneously.