Brake Actuator Tie Down's brake actuator represents over two years of product development and eight months of continuous testing. The unique all aluminum master cylinder incorporates the shock absorber into the master cylinder assembly. The oversized master cylinder design positively provides for quicker stops when using traditional drum brakes due to the significantly higher pressures. Even the coupler is manufactured out of heavier gauge steel when compared to all other actuator manufacturers. Model 66 provides for 6,600 lb. capacity. Model 80 provides for 8,000 lb. capacity and includes a 8,000 lb. 2" hitch ball.