Reliability. Everything on the kart lasts forever except the super soft 40mm axle. 
Is there an Arrow dealer even? 
It is far messier and more of a pain in the @ss, but it can be done similarly to the way it is done on a car.
Start by removing the reservoir caps on the Master Cylinder and topping off the fluid level. Re-install the caps. It helps to have two people for the next part.
Next pump the brake pedal a few times then hold it down. Have your assistant open the bleed screw at the brake caliper. There should be two reservoirs and two bleed screws for a standard single rear brake setup. Do one at a time. As the screw opens you will feel the brake pedal move. Once it stops moving, have your assistant tighten the bleeder screw.
One way to make it less messy is to attach a spare piece of fuel line to the nipple of the bleed screw and have it drain into an empty bottle. You can drill out the bottle cap to the diameter of the tubing to make it stay in place better. A strand of safety wire wrapped around the bottle neck comes in handy to hang it off the frame as well.
Repeat this process for each side of the caliper, then recheck the fluid level. The reservoirs are small, so it does not take long for them to deplete and if they get too low you will just introduce more air into the system defeating the purpose. You will have to repeat these steps several times to ensue that all of the air is out of the system.
On the flip side, the OTK Bleeder system allows to to bleed the Master Cylinder by it self of air, then bleed the lines and calipers together. It takes a tenth of the time and you don’t introduce air into the system because its fed by an external reservoir.
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