Brake calipers come in various sizes and configurations including fixed-caliper, multi-piston designs and the more modern floating-caliper, single piston designs that may also contain a mechanically actuated parking brake. These calipers have undergone a series of design changes that continue to make them more adaptable to model import vehicle applications. The brake caliper piston in your vehicle is too crucial since it is responsible for compensating for brake pad wear by extending as the brake pad lining wears away.
The caliper piston must be fully seated in the caliper housing when new pads are installed. This is to allow the pads to slip over the rotor. It is only when the piston boot is clean, pliable and fits tightly into the caliper that you can say that the piston is safely re-seated. On the contrary, the caliper must be either replace or rebuild if the piston boot is torn and has allowed dirt and moisture to migrate under the piston seal. The brake caliper part that oftentimes fails is the caliper piston boot. While it is true that the caliper piston is deliberately made to be tough, a torn rubber boot often exposes the piston to road debris and corrosion. Expect the dirt to migrate under the piston seal which in turn creates a wear groove on the piston surface when the boot starts to fail.
Constant exposure allows the moisture to contaminate the brake fluid, and therefore aggravates the corrosion. Eventually, rust corrosion causes the caliper piston to stick in an applied position against the brake pad. You must learn that all components of the braking system especially the caliper are working in an extremely hostile environment. This is why common problems with them include heat damage from extended braking, mechanical damage caused by road debris and corrosion damage caused by wintertime humidity and road salt. Good thing you are a Parts Train customer. We got all the braking components for replacement including the Bendix caliper piston.
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