Downgraded to one star because either this device is defective or simply doesn't have much gripping power. It moves the calipers and pads, but it doesn't push on the rotor enough to slow the wheel. Thinking it was either air in the system or a weak/faulty master cylinder, I bought another master cylinder with an external reservoir that I could easily check and fill. This allowed me to force the brake fluid through the entire system to remove air bubbles. Still no grip power. Should be in the…