Converting Airstream Sport Single Axle From Drum to Disc Brakes

Updated 10/20/2026 | Published 10/19/2026

Question:

I want to convert my Airstream 21FB sport single axel to disc brakes. Do you have a recommended kit or parts list? Thank you, Andrew

asked by: Andrew W

Expert Reply:

Hey Andrew! I can definitely help you put together a disc brake conversion for your Airstream Sport. It looks like you have a 4,500 lb single axle with 12" electric drum brakes and a 6 on 5-1/2 bolt pattern. More than likely this uses the same hub and brake configuration as a standard 5,200 lb axle.

Based on that information, I recommend the Hydrastar Disc Brake Conversion Kit # HYD94VR. This is a complete single axle setup that includes 12" hub and rotor assemblies, calipers, brake lines, and the electric over hydraulic actuator. It's designed for 5,200 to 6,000 lb axles with standard #42 spindles.

Since your Airstream doesn't have a typical axle rating, I recommend verifying compatibility. Can you send me a picture of the axle tag? That will help confirm this is the correct kit.

expert reply by: Robin H