What up Tory. (I’m finding these karts to be a money pit too, but that’s a post for another day, huh?)

You’ve already rebuilt the calipers. All new seals, but the pistons are sticking unevenly?

Could the seals have been put in upside down on that particular caliper, or does it even matter how they go in?

I’m new to all this as well, and this is one part on these karts that need to be right.

Tory, welcome to the sport. There will be days when you show up to the track to play, and some others when you just have a hard time and just wrench

Don’t get discouraged, this happens to all of us, soon or later.

Please tell me how exactly you bleed the front brakes. Did you use the tool for gravity feed? If not then that could be a problem, you can’t really pump that system like a car.

Usually master cylinders should be rebuilt right about the same time.

1.  Agree with Freddy, you need a gravity or pressure feeder.  Also, are the hoses routed so any part loops above the level of the bleed screws on the caliper?  If so, you might have an air pocket there.

2.  Although the brakes should be self-adjusting, you might need to shim the pads  on one side to equalize the gap.

3.  Finally, if the spindles are slightly bent/tweeked from contact or temporarily operating the karts as a lawn mower :) this can result in the caliper  being misaligned with the rotor.  Generally you can shim around that.