The Kia Optima Brake Caliper changes hydraulic pressure into the gripping force that slows the sedan down. Housed in a tough cast iron body, the Brake Caliper has steel or phenolic pistons that push the friction pads against the rotor whenever the pedal drops, trading speed for heat. Through the model years, the engineers selected two basic designs to equip the Optima, fixed and floating. A fixed Brake Caliper remains centered over the disc and employs opposing pistons on both sides; there is even pad pressure and good, repeatable stops, but the caliper has more weight and cost. A floating Brake Caliper has one inboard piston and floats on lubricated pins, sliding inwards from the extended piston when both pads are biting it, being lighter and cheaper but prone to sticking if dirt or rust gets into the slides. This choice allowed Kia to balance cost and performance, and regular quality checks help Kia drivers avoid uneven wear that could upset Optima stability. Rear units can conceal a screw style parking feature; therefore, pistons must be spun back when servicing the pads. Ignoring leaks, torn boots, or seized movement risks a pull, drag, or sinking pedal in any Kia Optima that relies on a healthy Brake Caliper.
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