Riders in Europe who use
the bike daily in the winter will find that when the bike is more than
three years old or so they will suffer from sticking brakes. The
symptoms are that after a days ride on salt laced roads the next morning
the bike will be almost impossible to move due to the brakes 'sticking'
This is caused by a combination
of road 'gunge' coating the shiny smooth surfaces of the calliper pistons
and the piston seals loosing their strength to pull the pistons off the
disk when you finish braking. The disks also quickly gets a light
coating of rust overnight to add to the problem and the pads stick to this.
The brake pads are normally lightly
in touch with the disk surface when you are not braking.
A temporary fix for this problem
could be achieved by spraying the callipers by high pressure hose to try
to clean them up. Avoid aiming the water at the wheel bearings.
Further, you could remove the brake
pad securing pins and clean them. These allow the pads to slide back and
forth. If they are corroded or dirty, again the pads will not come
off the disks overnight. Easy job to do, removing the pins that is,
if you can get the dust cap screw undone!
If the pins are no longer smooth
consider replacing them as they are not expensive. The latest versions
appear to be anodised, whereas the originals were steel and more liable
Certainly, when renewing brake pads,
you should clean the piston surfaces before pushing them back into the
calliper and installing the new, thicker pads.
If you notice that the brake pads
are wearing unevenly this indicates a fault. It will mean partial
seizure of the calliper moving parts so that the opposite pad is doing
all the work.
The calliper needs unbolting and
pulling apart to see if the 'sliding' rods joining the two halves need
cleaning or if the piston surfaces are corroded and need replacing, along
with the seals.
Replacing the pistons and the two
seals is best for a long term 'repair' to solve this problem.
I'm no expert, so speak to an experience
mechanic for advice.