Roadmax 4K400AP Serpentine Belt

Roadmax 4K400AP Serpentine Belt Overview

The Roadmax 4K400AP is a standard automotive V-ribbed belt built for accessory drive service where dependable operation matters more than premium-duty performance. Made with EPDM and polyester cord reinforcement, it is sized for 4-rib applications with an effective length of 1019 mm (40.133 in.) and an outside circumference of 1032 mm (40.625 in.).

Roadmax positions this belt line for budget-conscious buyers who want a quality replacement serpentine belt without stepping up to a higher-performance premium option. The 4K400AP is a direct-fit style replacement for a range of accessory drive belt system applications, including power steering, air conditioning, alternator, and fan drive setups on select vehicles.

Key Features

• Standard automotive V-ribbed belt for accessory drive service
• EPDM construction for everyday underhood durability
• Polyester cord material for reinforced belt stability
• 4-rib design with K cross section
• Top width of 14 mm (.56 in.)
• Effective length: 1019 mm (40.133 in.)
• Outside circumference: 1032 mm (40.625 in.)
• Roadmax part number 4K400AP

Detailed Description

Roadmax 4K400AP is an automotive V-ribbed belt designed for standard replacement use in accessory drive systems. Its EPDM belt material and polyester cord construction provide the dimensional consistency needed for common belt-driven accessories, while the 4-rib profile and K cross section support proper belt tracking in the pulley system. This part number, 4K400AP, is listed across multiple OE-style replacement references for the same application, including Gates K040400 and Dayco 5040400.

Compatible vehicle applications include select Honda Prelude power steering, Nissan 300ZX fan and alternator, Mazda Protege air conditioning and power steering, Suzuki Grand Vitara power steering, and Chevrolet Tracker power steering. It also appears in fitment for several other makes and models, including Jaguar XJ6 air conditioning and Kia Sephia power steering and air conditioning. Use the confirmed vehicle listing to match the correct accessory drive belt system before ordering.

Vehicle Fitment Examples

• Fits 1999-2005 Suzuki Grand Vitara, power steering; W/O A.C.
• Fits 2001-2004 Chevrolet Tracker, power steering; W/O A.C.
• Fits 2004 Suzuki Vitara, power steering; W/O A.C.
• Fits 1992-2001 Honda Prelude, power steering
• Fits 1993-1997 INFINITI J30, fan and alternator
• Fits 1995-1997 Jaguar Vanden Plas, air conditioning
• Fits 1993-1997 Jaguar XJ6, air conditioning
• Fits 1995-1997 Jaguar XJR, air conditioning
• Fits 1994-1997 Kia Sephia, power steering and air conditioning
• Fits 1990-1996 Nissan 300ZX, fan and alternator
• Fits 1992-1995 Mazda 929, fan and alternator
• Fits 1990-1994 Mazda Protege, air conditioning and power steering
• Fits 1982-1986 Buick Skyhawk, power steering
• Fits 1982-1986 Oldsmobile Firenza, power steering
• Fits 1986 Pontiac Sunbird, alternator
• Fits 1984-1985 Pontiac J2000 Sunbird, alternator
• Fits 1982-1983 Pontiac J2000, power steering

Common Problems This Belt Can Address

• Cracked, glazed, or worn accessory drive belt surfaces
• Squealing from a slipping serpentine or V-ribbed belt
• Loss of belt tension caused by age-related stretch
• Reduced drive performance for power steering, alternator, A/C, or fan systems
• Noise or inconsistent operation from an aging belt in the accessory drive system

Installation Notes and Tips

Confirm the belt length, rib count, and cross section against the existing belt or vehicle service information before installation. This part is a 4-rib belt, so pulley alignment and routing must match the confirmed application. Inspect belt tensioners, idlers, and pulley grooves for wear before installing the new belt, and verify that the accessory drive system is free of contamination or damage.

For fitment-based searches, this part is commonly referenced for Honda Prelude, Nissan 300ZX, Mazda Protege, Suzuki Grand Vitara, and Chevrolet Tracker accessory drive belt applications. Roadmax 4K400AP should be matched to the exact engine and accessory configuration listed for the vehicle.

Quality Assurance

Roadmax markets the Automotive V-Ribbed Belt (Standard) line as a practical replacement option for buyers who want dependable quality in a standard-duty belt. The EPDM construction and reinforced cord design support consistent service in everyday accessory drive applications.