The rear brake on the LF250 is pretty poor at the best of times but can be improved slightly with a little lubrication. I removed my rear wheel and checked the brake actuating mechanism and found it to be devoid of any lubricant - namely grease. The pivot especially benefited from a bit of grease, though do be careful as grease and the brake linings do not go together. The thick cable coming from the foot brake lever itself was also quite dry so needed a good oiling. To minimise brake bind apply the foot brake whilst tightening the rear wheel nut - this ensures the brake drum is central.