KEEWAY F-ACT EVO Instruction & Maintenance Manual page 26

Failure diagnosis procedure when the hydraulic disc brake fails
The brake fluid level below the lower limit of liquid
reserve tank
Fill the brake fluid to the
upper limit of liquid reserve
tank, at the same time
check if there is oil leaking
in the brake caliper, brake
hose and hose joints
Failure diagnosis procedure when the drum brake fails
Readjust
Brake rocker arm
revolves smoothly, but
you feel resistance
when holding the
brake handle
The wire ropes of
brake control
cable can not be
pulled smoothly
in the cover
Check the brake fluid level in the brake primary pump liquid reserve tank
Check if the brake friction disc is
worn to limit mark and if the brake
plate is over-worn
Yes
Replace the brake
friction disc and
the brake plate
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
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
difficultly
1. Check if the crown face of the brake
The movable
cam is over-worn
parts of the
2. Check if the brake block friction disc
brake cam are
is over-worn
rusted or stuck
3. Check if the brake wheel hub inside is
in foreign
over-worn
materials
hydraulic disc brake fails
The brake fluid level above the lower limit of
liquid reserve tank
Check if there is ―sponge‖
feels when operating the
brake lever
No
N
1. Check if the surface of brake primary pump piston and oil
cylinder is over-worn
2. Check if the leather cup of brake primary pump piston cracks or
is damaged or ageing
3. Check if the seal ring of brake caliper cracks or is damaged or
ageing
4. Check if the surface of brake caliper and oil cylinder is
over-worn
Drum brake fails
The arrow on the indicating
plate of brake cam aligns with
or exceeds the ―▽‖mark on
the brake wheel hub cap
- 25 -
There is residual air
in the fuel line of
brake system
No
Yes
The arrow on the indicating plate
of brake cam does not align with
the ―▽‖mark on the brake wheel
hub cap
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
dis and brake hub is less than 70％
Yes