Buy Rear Brake Caliper (Left) KJ 03-05 (5179731AA)

The Rear Brake Caliper (Left) KJ 03‑05 (5179731AA) is a direct‑replacement hydraulic

brake caliper designed specifically for the left (driver’s) side rear disc brake system on

Jeep Liberty (KJ) models from 2003 to 2005. As a hcore component of the braking

system, the caliper plays a central role in converting hydraulic pressure into mechanical force

that clamps the brake pads against the rotor to hslow or stop the vehicle. Its proper operation is essential for balanced braking, vehicle control, and safety.

Manufactured to OEM specifications, the 5179731AA caliper features the correct mounting

points, piston size, and fluid passages to match the factory brake system. This ensures it bolts

into the existing rear brake assembly without modification and interfaces properly with

existing brake pads, hardware, and brake lines. The caliper also integrates with the vehicle’s

ABS (Anti‑Lock Braking System), maintaining system responsiveness under a variety of driving conditions.

The caliper body is typically made from robust

The caliper body is typically made from robust cast iron or high‑strength aluminum

alloy, chosen for its ability to withstand repeated pressure cycles and high heat generated

during braking. The caliper houses one or more pistons that press the brake pads against the

rotor when brake fluid pressure is applied. Because rear calipers engage less frequently than

front calipers in most driving conditions, they must still operate smoothly and consistently to maintain balanced brake performance and minimize uneven pad wear.

Inside the caliper, a sealed piston and dust boot protect internal components from

moisture, dirt, and debris. These protective seals help prevent corrosion and sticking, which

can lead to uneven braking or caliper bind. The left rear caliper works together with mounting

hardware, brake pads, sliders, and brake hoses to form a complete brake assembly that delivers reliable stopping power.

Replacement of the 5179731AA caliper is recommended when there are signs of internal

seal failure, piston corrosion, fluid leaks, uneven pad wear, or caliper sticking.

Symptoms of caliper issues may include brake noise, pulling to one side during braking, uneven pad wear, or a soft/brake pedal feel.

Installation involves removing the rear wheel and old caliper, disconnecting the brake line,

and installing the new unit with new mounting hardware and proper torque specifications.

After installation, the brake system should be bled to remove any air and ensure full hydraulic pressure.

In summary, the Rear Brake Caliper (Left) KJ 03‑05 (5179731AA) is a critical safety

part engineered for precise fitment and dependable performance. Its robust construction,

OEM compatibility, and reliable hydraulic action make it a vital replacement for maintaining effective rear braking on Jeep Liberty vehicles.