If you've used a hydraulic floor jack before, you've used the same principle on which your Plymouth brake caliper operates. Basically, a small piston moved a long distance (the brake master cylinder) is used to move a large piston a very short distance-the Plymouth brake caliper. The secret is that the large piston moved a small distance, in the Plymouth brake caliper, can exert tremendous forces. Think of it almost like 'hydraulic gearing.' Regardless, those tremendous forces are necessary for the Plymouth brake caliper to be able to squeeze the brake pads against the rotor, stopping your vehicle. With disc brakes, significant amounts of clamping pressure are required, making a hydraulic system utilizing the Plymouth brake caliper essential for effective operation. That's especially true when you throw modern inventions like ABS and traction control into the mix. For all its complexity, the Plymouth brake caliper is a remarkably reliable device too, capable of operating without fail for tens of thousands of miles. You can help your Plymouth brake caliper last even longer when you perform regular brake fluid flushes on your Voyager or Neon too. Brake fluid collects moisture over time, which can result in rust and corrosion on the smooth inner surfaces of the Plymouth brake caliper. When corrosion sets in, the seals in the Plymouth brake caliper that retain the fluid are quickly worn away. Fluid flushes cost very little and can go a long way towards maintaining the integrity of your Plymouth brake caliper and your entire brake system. If it's too late, though, and there are already signs of fluid on the outside of your Plymouth brake caliper, not to worry: We carry new and remanufactured OE-quality Plymouth brake caliper assemblies ready to bolt right on to your vehicle.