A pilot training in a new type aircraft with a known brake malfunction reported while landing they temporarily lost control of the aircraft resulting in a runway excursion.

Narrative

Working on my jump runs with other senior pilot. Both were Commercial Pilot and wearing a parachute. I knew the brake system is weird because all the senior pilots told me that 'try not to use brake; just use rudder and aerodynamic brake'. I was coming down to the runway and I made go around on first trial because I was fast and knew that the brake system is weird so I may not stop on the runway. Second trial; I made it short; and was rolling down half of the runway. By the time we pass Taxiway X; all of the sudden; left wing went up. So I try to correct it with the left rudder and left aileron; which cause go off to the left. Used the right rudder and brake to compensate for that; but right rudder and brake barely worked. Therefore; we off the runway to the left around 200 ft.Emergency guys checked the runway condition; lights; sign and everything; and they said everything was fine. Luckily we did not hit anything. But he told me there was a skid mark on the runway which is drawn to the left with the right main wheel tire. No one was injured; did not hit anything; the plane was fine. But we noticed that the right main wheel tire was almost edge of the flat tire. Person A who was on the right told me that the pilots who are working for this skydive company have been asking the boss if the brakes can be fixed; and Person 2 and Person 3 tried to fix it but still has the same issue.However; even though with that problem; senior pilots have been making safe landings so far. I unconsciously used the brake which was unnecessary. Now I realized that it is better to use aileron to correct the attitude if left or right wing go up while rolling down the runway; not the rudder. Each airplane characteristics is all different; so I realized that the appropriate procedures has to be followed. I should have acted accordingly; not like I was flying the plane I have been flying.