4Pcs Air Spring Bag Fits Peterbilt Trucks - Durable Replacement

In this review the author looks at the 4Pcs Air Spring Bag designed as a direct replacement for Peterbilt trucks, aimed at drivers needing reliable air suspension repairs. The bottom line: this kit is for fleet owners and truck technicians who want a heavy-duty, OEM-style replacement that improves load balancing and reduces vibration. The reviewer found its construction-4.5-5.00mm high density rubber with reinforced 4140 grade steel studs-gives a solid balance of durability and service life compared with basic replacement bags.

Key Features

• Direct fit compatibility: Fits multiple OEM references including 02456, 04759 and 06746, making it straightforward to match on many Peterbilt applications.
• Durable material: Constructed from 4.5-5.00mm thick high density rubber to resist wear and exceed common OEM thickness expectations for longer life.
• Reinforced studs: Uses 25% stronger 4140 grade steel studs to improve mounting integrity under heavy loads and reduce the chance of stud failure.
• Measured dimensions: With a top plate width of 9 in and piston width of 9.5 in, the bag fits the expected envelope for specified Peterbilt suspension locations.
• Ride and stability benefit: Air suspension design provides improved load balancing and reduces impact and vibration for safer, more comfortable operation.
• Warranty support: Backed by a 3 year unlimited-mileage quality guarantee, giving confidence for fleet use and long-term service planning.

Who It's For

This replacement set is best for Peterbilt owners, fleet maintenance crews, and independent heavy-truck mechanics who need a robust, OEM-compatible air spring bag. The product suits trucks using the referenced part fits such as AS-8312, AS-8577, AS8813 and equivalent codes where straightforward fitment and durability are priorities.

It is less suitable for drivers seeking a bespoke suspension tune or for very light-duty commercial vehicles where a simpler, lower-cost solution would suffice; likewise, buyers should confirm the specific fit numbers against their truck before purchase to ensure compatibility.

Pros & Cons

Pros

• High density rubber construction improves longevity under heavy use.
• Reinforced 4140 grade steel studs reduce risk of hardware failure.
• Clear dimensional specs (extended height 18 in, compressed 7.5 in) aid fit verification and installation planning.

Cons

• Not a universal fit; buyers must confirm match to listed fit numbers and vehicle models.
• Heavier or more advanced aftermarket suspension options may offer different ride tuning features.

Specifications

Top Plate Width	9 in
Piston Width	9.5 in
Extended Height	18 in
Compressed Height	7.5 in
Weight	13.40 lbs (per bag)
Material	4.5-5.00mm high density rubber
Warranty	3 year unlimited-mileage quality guarantee

Our Verdict

The 4Pcs Air Spring Bag kit is a sensible choice for anyone maintaining Peterbilt air suspension who needs a durable, OEM-style replacement with clear dimensions and strong hardware. It delivers solid value through reinforced construction and a three-year warranty, making it a dependable option for fleet upkeep and long-haul service where reduced vibration and improved load balancing matter.

Frequently Asked Questions

Will these air spring bags fit my Peterbilt?
They fit models that match the listed reference numbers (for example 02456, 04759, 06746 and equivalents); confirm your truck's part reference before ordering.

What material and hardware improvements are included?
Each bag uses 4.5-5.00mm high density rubber and is reinforced with 4140 grade steel studs that are stated to be 25% stronger than typical studs.

What warranty is offered?
The product comes with a 3 year unlimited-mileage quality guarantee and the seller invites contact for any questions.