let us know the kart chassis make and the brake model and someone will guide you through the maintenance. If you can post a photo on flickr, photobucket or other host and post link here it will all help.
A few points that may help track down the problem:
# the whole axle is located from side to side by grub screws in the axle bearings. # these can come loose and allow the axle to move # when the axle moves sideways the brake disc can rub on the brake pads # some brakes allow you to centralise the caliper on the disk # the disk is clamped to the axle and can be centralised within the caliper # bumping the kart sideways can move the axle and misalign everything # take the rear wheels off and start measuring from bearing hangers to each end of axle.(they should be equal) # worn out axle bearings make a grinding/rumbling noise # worn out bearing can seem to spin freely but will cause excessive friction under load
# if you change any parts take digi photos and measure before stripping assembly
Good luck and just work through the engineering logically.
Brian P.
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