The Nissan Altima Brake Caliper makes use of hydraulic pressure in generating a clamping force that squeezes the pads onto the rotor. Subsequently, it lets the sedan slow or stop with confidence. The Brake Caliper features one or more pistons, either steel or phenolic, sealed in bores that keep the fluid in and dirt out. It has a bleeder screw and a port for the brake hose. Through the years, the Altima models have applied two main Brake Caliper styles, fixed and floating. Fixed versions securely attach to the knuckle by means of a bolt, with opposing pistons on both sides of the disc. On these, there is even pressure with a strong pedal feel. Floating units place the pistons only inboard. The mechanism slides on pins. Thus, the whole assembly moves to clamp the rotor. This is a simpler setup that saves weight and cost. Some rear floating Brake Caliper units of the Nissan midsize employ a screw-type parking mechanism that winds the pistons back when the handbrake is pulled. A sticking Brake Caliper can cause a pulling or dragging sensation and uneven pad wear. Look for leaks, torn boots, or grinding noises to stay ahead of trouble in your Altima braking system and keep your Nissan safe and responsive.
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