Starter Motor For Ford Power Stroke F250 F350 E350 F450 Super Duty 6.0L CW 12TH. The brake caliper fits like a clamp on a wheel’s rotor to stop the wheel from turning when you step on the brakes. When you push the brake pedal, brake fluid creates pressure on pistons in the brake caliper, forcing the pads against the brake rotor and slowing your car.