Roadmax 4K315AP Serpentine Belt

Roadmax 4K315AP Serpentine Belt Overview

The Roadmax 4K315AP is a standard automotive V-ribbed belt built for accessory drive service where dependable operation matters more than premium-duty performance. It uses EPDM construction with polyester cord reinforcement for consistent belt tracking and everyday durability.

Roadmax positions this Automotive V-Ribbed Belt (Standard) line for budget-conscious repairs that still call for quality materials and proper fit. If you need a replacement serpentine belt for a Lexus GS450h water pump, a Honda Civic alternator, or a BMW X5 air conditioning drive, the 4K315AP is built to match the application requirements.

Key Features

• EPDM rubber construction for modern accessory drive belt service
• Polyester cord material for strength and dimensional stability
• 4-rib design for the specified accessory drive applications
• Cross section designation K
• Effective length: 31.65 in. / 804 mm
• Outside circumference: 32.25 in. / 818 mm
• Top width: 0.56 in. / 14 mm
• Roadmax part number 4K315AP

Product Details

This serpentine belt is intended for accessory drive systems that use a standard V-ribbed profile. The EPDM belt material is commonly used in modern engine accessory drives for stable performance under heat and repeated cycling, while the polyester cord helps maintain belt shape and tension response. This part cross-references Gates K040315 and Bando 4PK800 for the same application.

Compatible vehicle coverage includes applications such as Fits 2013-2018 Lexus GS450h, Water Pump; Fits 1996-2000 Honda Civic, Alternator; and Fits 2008-2012 BMW X6, Air Conditioning. The 4K315AP also appears in fitments for the Smart Fortwo, BMW 750Li, BMW X5, and other listed vehicles across the 1989-2018 model years.

Common Problems This Belt Can Address

• Squealing or chirping from a worn accessory drive belt
• Cracking, glazing, or rib wear on the existing serpentine belt
• Loss of accessory drive performance at the alternator, A/C compressor, or water pump
• Belt stretch or poor tension retention from age and heat exposure
• Service replacement for scheduled maintenance on listed Lexus, Honda, BMW, and other applications

Installation Notes and Tips

Verify belt routing, rib count, and measured length against the vehicle application before installation. Inspect pulleys, tensioners, and idlers for wear or misalignment, since those conditions can shorten belt life. Confirm the accessory position listed in the fitment data, such as alternator, air conditioning, power steering, or water pump, before ordering the Roadmax 4K315AP.

Quality Assurance

Roadmax offers this standard V-ribbed belt as a value-focused replacement option for drivers who want quality materials without stepping up to a premium belt line. The EPDM construction and reinforced cord design support consistent service in the specified accessory drive applications.