Parts Needed to Convert 2021 Momentum 397TH Triple Axle to Disc Brakes
Updated 11/03/2025 | Published 01/26/2025
Question:
I have a 2021 momentum 397th triple axle, 8 stud 7k axles. Looking to convert to disc. I watched the video on the 2019 solly conversion Can you provide the parts list I need? Rotor kit, line kit, actuator, bearings seals?
asked by: Duane E
Expert Reply:
Hey Duane, we have the perfect kit for you with the part # HYD54FR which comes with everything needed to convert a triple axle trailer to electric over hydraulic disc including the best actuator, all brake lines, breakaway kit etc.
Only thing worth checking is your wheel stud size. Verify they are 9/16 inch for me and this for sure is all you need.
Product Page this Question was Asked From
Hydrastar Disc Brake Kit w/ Actuator for Triple Axle Trailers - 9/16" Studs - 8 on 6-1/2 - 7K
- Trailer Brakes
- Disc Brakes
- Marine Grade
- 8 on 6-1/2 Inch
- Hub and Rotor
- 9/16 Inch Studs
- 7000 lbs Axle
- 16 Inch Wheel
- 16-1/2 Inch Wheel
- Hydrastar
more information >
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Jameson C.
11/3/2025
Hey Duane, did you get a chance to confirm your wheel stud size for that triple axle setup? Once you verified that, did the Hydrastar disc brake kit include everything you needed for the conversion? Your update could make it easier for the next person doing the same upgrade.