Tie Down?s brake actuator over two years od 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 6,600lb capacity. Model 80 provides for 8,000lb capacity and includes a 8,000 lb 2" hitch ball.