A C210 pilot reported loss of engine power on short final and brake failure during landing resulted in a runway excursion.

Narrative

I was performing closed traffic takeoff and landings. On this particular approach I was cleared for a short approach with a low approach only. On short final to Runway XX; approximately 50 feet AGL and less than 1000 feet to the runway threshold; the engine experienced a sudden loss of power. I immediately lowered the nose to maintain airspeed and continued the approach. While simultaneously informing the Control Tower of the situation and that I would need to land; also understanding there was an airline flight on a 5 mile final. I landed within the first third of the runway at a normal touchdown speed.Upon touchdown; I applied brakes and noted little to no braking response; specifically on the left brake. Thus causing the aircraft to veer to the right initially. I attempted to apply additional braking; but the aircraft did not decelerate or maintain directional control as expected. With directional control becoming difficult; the aircraft exited the right side of the runway into the grass. The aircraft came to rest without further incident. No injuries occurred. After shutdown; I confirmed the brake pedal travel felt abnormal.Contributing Factors:- Engine malfunction at low altitude reduced options and required a committed landing.- Brake system failure following touchdown.Corrective Actions / Lessons Learned:- Will review engine failure procedures with emphasis on short final scenarios.- Will reinforce preflight brake checks and verify maximum pedal pressure response.Follow-ups:- Next day inspection by A&P reported 'Bad spring on the release valve in the master cylinder.'