KSR Ride Speedy, Repair Manual

Page: 15 / 79

FAILURE DIAGNOSIS 15
FAILURE DIAGNOSIS PROCEDURE WHEN THE DRUM BRAKE FAILS
The wire ropes of
brake control
cable can not be
pulled smoothly in
the cover
Brake
rocker arm
revolves
difficultly
The arrow on the
indicating plate of brake
cam aligns with or
Exceeds the “
▽
” mark on
the brake wheel hub cap
The arrow on the indicating
plate of brake cam does not
align with the “
▽
” mark on
the brake wheel hub cap
The
movable parts
of the brake
cam are rust-
ed or stuck
in foreign
materials
1. Check if the crown
face of the brake cam
is over-worn
2. Check if the brake
block friction disc is
over-worn
3. Check if the brake
wheel hubinside is
over-worn
1. Check if the surface of
brake block friction disc is
stained with oil
2. Check if the contact area
between the brake block
friction disc and brake hub
is less than 70%
Drum brake fails
Check if the free stroke of brake lever is
within 10mm ~ 20mm or check if the free
stroke of brake pedal is within 20mm ~ 30mm
No
Yes
Readjust
Separate the steel ropes of brake rocker arm and brake
control cable, then pull the brake rocker arm by hand to check
Brake rocker arm
revolves smoothly,
but you feel
resistance when
holding the brake
handle