NISSAN 44140-VB200 Brake Caliper Slide Pin

The Nissan 44140-VB200 genuine OEM brake caliper slide pin (guide pin) is a critical safety component of the vehicle's disc brake system. Its role is to ensure smooth, unobstructed axial movement of the brake caliper on the caliper mounting bracket during braking, ensuring even contact and wear of the brake pads.

Technical Features and Specifications

Although exact physical dimensions are not detailed in the factory database, the product features the following general and specific technical specifications:

• Manufacturer: NISSAN (Genuine OEM part)
• OEM Part Number (SKU): 44140-VB200
• Alternative / OEM Reference Numbers: 0274Y51LF (Febest)
• Material Composition: Precision-machined, high-tensile hardened steel engineered to withstand high temperatures and mechanical stress.
• Surface Treatment: Specialized anti-corrosion coating to prevent rust and seizing.

Role and Function of the Brake Caliper Slide Pin

In floating caliper disc brake systems, the caliper must be able to move slightly perpendicular to the plane of the brake disc. When the brake pedal is depressed, hydraulic pressure forces the brake piston against the inner brake pad, pressing it against the rotor. Simultaneously, the brake caliper slides along the guide pins, pulling the outer brake pad against the opposite side of the rotor, applying equal clamping force from both sides. Proper lubrication and condition of the slide pins are essential for the efficient and safe operation of the braking system.

Common Symptoms of Wear and Failure

Brake caliper guide pins are exposed to harsh environmental factors (moisture, road dirt, de-icing salt, and high operating temperatures). If the protective rubber boot is damaged, moisture can penetrate, causing corrosion and pin seizure. The most common symptoms of failure include:

• Uneven Brake Pad Wear: If a slide pin binds or seizes, one brake pad may remain in continuous contact with the rotor, causing premature and uneven wear.
• Reduced Braking Performance and Pulling: The vehicle may pull to one side during braking because the caliper cannot clamp evenly.
• Brake Overheating: A seized slide pin prevents the brake pads from retracting properly after braking, resulting in continuous drag, excessive heat buildup, and potential rotor warping.
• Abnormal Noises: Metallic squeaking or rattling noises from the caliper assembly caused by excessive play or sticking pins.

During routine brake maintenance (such as brake pad replacement), it is always recommended to clean and inspect the slide pins, apply high-temperature silicone-based brake grease, or replace them if damaged or worn.