Buy Brake Caliper Piston (Rear) zj / kj / tj (4762111)

The Brake Caliper Piston (Rear) ZJ / KJ / TJ (4762111) is a precision component used

in the rear disc brake calipers of several Jeep models, including Jeep Grand Cherokee

(ZJ), Jeep Liberty (KJ), andh Jeep Wrangler (TJ). hDesigned as an OEM-style

replacement, this piston plays a central role in converting hydraulic pressure into the

mechanical force required to press the brake pads against the rotor, ensuring effective and controlled braking.

Positioned inside the rear brake caliper, the piston operates when brake fluid pressure is

applied from the master cylinder. As pressure builds, the piston moves outward, pushing the

inner brake pad against the rotor surface. At the same time, the caliper mechanism allows the

outer pad to engage, creating even clamping force. This process is essential for balanced braking performance and safe vehicle operation.

The 4762111 piston typically features

The 4762111 piston typically features an outer diameter of approximately 47.9 mm,

making it precisely sized for compatibility with factory rear caliper assemblies.  It is designed

to fit vehicles equipped with rear disc brakes and works in conjunction with seals and

protective boots to maintain hydraulic pressure and prevent contamination.

In terms of construction, this piston may be made from phenolic composite or coated

metal, depending on the manufacturer. Phenolic materials are commonly used because they

resist corrosion and reduce heat transfer from the brake pads to the brake fluid, helping

maintain consistent braking performance.  Metal pistons, on the other hand, offer high

strength and durability under heavy braking conditions. Both types are engineered to withstand high temperatures, pressure, and repeated braking cycles.

This piston is widely compatible across multiple Jeep platforms, including engines ranging

from 2.4L to 3.7L gasoline and 2.5L to 2.8L diesel variants. It also cross-references

with related part numbers such as 5093275AA, making it a versatile replacement option for rear caliper repairs.

Positioned inside the rear brake caliper

Installation of the caliper piston is typically part of a caliper rebuild process, which

involves removing the old piston, cleaning the caliper bore, replacing seals, and installing the

new piston with proper lubrication. This task requires attention to detail to ensure proper sealing and smooth operation.

Common signs of piston failure include brake drag, uneven pad wear, fluid leaks, or

reduced braking efficiency. If the piston becomes corroded or stuck, it can prevent proper pad movement and compromise safety.

In summary, the Rear Brake Caliper Piston (4762111) is a vital component that ensures

efficient hydraulic braking. Its precise design, durable materials, and compatibility across multiple Jeep models make it essential for maintaining safe and reliable rear brake performance.