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'Sticking' Brakes Problem
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' on.

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 to corrosion?

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.

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