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44
Problem
Brakes not working effectively
When applying the brakes
they squeal/squeak
Knocking or shuddering when
applying brakes
Wobbling wheel
Steering not accurate
Possible Cause
- Brake blocks worn down
- Brake blocks/rim greasy, wet or dirty
- Brake cables are
binding/stretched/damaged
- Brake levers are binding
- Brakes out of adjustment
- Brake blocks worn down
- Brake block toe-in incorrect
- Brake blocks/rim dirty or wet
- Brake arms loose
- Bulge in the rim or rim out of true
- Brake mounting bolts loose
- Brakes out of adjustment
- Fork loose in head tube
- Axle broken
- Wheel out of true
- Hub comes loose
- Headset binding
- Hub bearings collapsed
-
QR mechanism loose
- Wheels not aligned in frame
- Headset loose or binding
- Front forks or frame bent
Remedy
- Replace brake blocks
- Clean blocks and rim
- Clean/adjust/replace cables
- Adjust brake levers
- Center brakes
- Replace blocks
- Correct block toe-in
- Clean blocks and rim
- Tighten mounting bolts
- True wheel or take to a bike shop
for repair
- Tighten bolts
- Center brakes and/or adjust brake
block toe-in
- Tighten headset
- Replace axle
- True wheel
- Adjust hub bearings
- Adjust headset
- Replace bearings
-
Adjust QR mechanism
- Align wheels correctly
- Adjust/tighten headset
- Take scooter to a bike shop for
possible frame realignment
43
On some newer type cantilever brakes, the main brake cable
continues through the central cable carrier to an anchor bolt on one
of the brake arms. A shorter link cable reaches from the carrier and
the hook on the other brake arm. Adjustment of the cable length is
made after loosening the anchor bolt on the brake arm.
Adjust the brake pad position so that it is parallel to the wheel rim
and so that the leading edge makes first contact. To do this, fit an
Allen key into the brake pad holding bolt, loosen the fixing nut and
adjust. Move the brake pad along its mounting post to alter the
distance from the rim, and move the curved adjustment washer to
alter the angle of the pad.
On some models there is a spring-force adjustment screw on the
brake arm which allows further fine tuning of the brake shoe position.
Scooters with cantilever brakes must be fitted with safety devices
to prevent a possible accident in the event of the brake control
cable or the straddle bridge becoming loose or breaking while
riding. These are usually the reflector brackets, and must be fitted
in the front and rear. The bracket will prevent the straddle cable
from interfering with the wheel should the cable become discon
-
nected from the control cable. If the reflector brackets are not fitted
in this position, then alternative emergency cable safety stops must still
be fitted.
Usable Brake Shoe Worn Out Brake Shoe (Replace)
Tread Tread Worn Off
Align brake shoe with rim surface
Direction of rim
rotation
0.5 - 1.0 mm
Brake Shoe Holding Nut