Depending upon the braking system,you need to service it accordingly.I assume it is 85cc engine and it will have a drum disk.You need to remove the tyre and check the pads,if the pads are fine then give it a good high pressure air to blow away all the dust inside.Then put back things tohether and adjust brake to stop the pedal from going too much down accordingly.Make sure all bolts are secured,align wheel and check chain tension when assembling.Hope this help.
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its a disc brake 1 piston thanks anyway mate
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