My son's Kazuma 90 brakes seem to be tightening up to a point where the thing will not move. I bleed the brakes and they loosen up for a short time. It seems the calipers will tighten, but not loosen up when the brake is released. I am thinking it is the master cylinder, but could use some help. Should I take each caliper apart, clean and flush the lines?

 

I have the same problem with my sons new Mini Falcon Deluxe 90 and havent gotten an answer as to why . I also bled the brakes , I lube the front axle but it seems the front tires dont spin easily .

I'll keep checking back to see if you get an answer ....good luck .