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Here, one of the spindles is mounted in a vise to hold it steady whilethe proper locations are determined. The rotor is attached to thespindle, and the caliper is clamped on the rotor by using air pressureto engage the brake pads against the rotor. By releasing the airpressure, the caliper can be moved until the right location in relationto the rotor and spindle is found. This is a lot cleaner than trying touse hydraulic fluid.