NISSAN 44139-5Y50A Brake Caliper Slide Pin

This genuine OEM NISSAN brake caliper slide pin (SKU: 44139-5Y50A) is a premium quality, precision-engineered component essential for the safe and efficient operation of floating caliper braking systems.

Function and Operating Principle

The brake caliper slide pin ensures smooth axial movement of the caliper on the caliper carrier bracket. When the brake pedal is depressed, hydraulic pressure forces the caliper piston to push the inner brake pad against the brake disc. Concurrently, the caliper body slides along the guide pins, pulling the outer brake pad into contact, thereby providing balanced, dual-sided clamping force.

Symptoms and Consequences of Failure

Caliper slide pins are continuously exposed to harsh environmental factors (moisture, road dirt, de-icing salt) and extreme operating temperatures. If the protective dust boot is damaged, moisture and debris can enter, causing corrosion and pin seizure. Common signs of failure include:

• Uneven brake pad wear: If a pin seizes, one pad may drag continuously against the disc, leading to premature and uneven wear.
• Sticking or seized caliper: The brake fails to release completely, resulting in brake overheating, rotor warping, and increased fuel consumption.
• Vehicle pulling under braking: If a caliper does not slide smoothly on one side, the vehicle may pull to one side during braking.

Technical Specifications and Features

• Manufacturer: NISSAN (Original Equipment Manufacturer)
• Part Number: 44139-5Y50A
• Interchange / OEM Numbers: 441392Y000, 44139-2Y000
• Material: High-strength, heat-treated steel alloy for maximum wear resistance and structural integrity.
• Surface Treatment: Specialized anti-corrosion coating designed to minimize friction and prevent seizure.

Note: When servicing the brake system, it is recommended to replace the protective rubber dust boots concurrently with the slide pins and lubricate using appropriate high-temperature silicone-based brake caliper grease.