What Is The Difference Between Hydrastar Kits HYD22FR And HYD42FR?
Updated 09/08/2025 | Published 06/03/2025
Products Featured in This Question
Question:
Whats the difference between this kit and the 22FR kit?, is this a complete everything needed to swap from hydraulic surge brakes?
asked by: James
Expert Reply:
Hello James, thanks for reaching out. Both the kits you mentioned, the Hydrastar # HYD22FR and # HYD42FR are complete conversion kits for standard 3,500 lb axles. The difference is the calipers included with each kit.
The # HYD22FR has stainless steel calipers, while the # HYD42FR comes with Dacromet coated calipers. Aside from that both kits come with everything you need to convert to EOH disc brakes. You will just need to make sure your tow vehicle is equipped with a brake controller that is compatible with electric over hydraulic brakes. The Tekonsha P3 # 90195 is what I recommend for that.
What kind of trailer are you wanting to install this on?
Product Page this Question was Asked From
Hydrastar Disc Brake Kit w/ Actuator for Tandem Axle Trailers - 10" Rotor - 5 on 4-1/2 - 3.5K
- Trailer Brakes
- Disc Brakes
- Standard Grade
- 5 on 4-1/2 Inch
- Hub and Rotor
- 1/2 Inch Studs
- 3500 lbs Axle
- 14 Inch Wheel
- 15 Inch Wheel
- Hydrastar
more information >
Continue Researching
- Search Results: brake kit
- Shop: Hydrastar Disc Brake Kit w/ Actuator for Tandem Axle Trailers - 10" Rotor - 5 on 4-1/2 - 3.5K
- Search Results: dexter a75
- Search Results: coupon codes
- Search Results: electric over hydraulic adapter
- Search Results: marine electric brakes
- Search Results: surge brake kit
- Search Results: eoh actuator
- Q&A: Will Deutsche Hydrapro CAM Adapter Module Work with DeeMax Actuator
- Shop: Hydrastar Disc Brake Kit w/ Actuator for Tandem Axle Trailers - 10" Rotor - 5 on 4-1/2 - 3.5K
- Q&A: Marine Rated Hydrastar Disc Brake Kit for Tandem Axle 3,500 lb Axle
- Video: Review of Hydrastar Trailer Brakes - Tandem Axle Disc Brake Kit - HYD22FR
- Video: Review of Demco Straight Tongue Trailer Coupler - Bolt On eZ-Latch 2 Inch Ball Silver - DM15000-52
- Shop: DeeMaxx Disc Brake Kit - 10" Rotor - 5 on 4-1/2 - Maxx Coating - 3,500 lbs
- Shop: Demco Straight Tongue Trailer Coupler - eZ-Latch - Silver - 2" Ball - Bolt On - 10,000 lbs
- Shop: Dexter DX7.5L A-60 Brake Actuator w Electric Lockout - Bolt On - Disc - 2" Ball - Zinc - 7.5K
- Q&A: What Is The Difference Between Parts HYD22FR And HYD42FR?
- Video: Review of Hydrastar Trailer Brakes - Tandem Axle Disc Brake Kit - HYD42FR
- Shop: Kenda Karrier KR53 ST205/75R14 Radial Trailer Tire with 14" Galvanized Spoke Wheel - 5 on 4-1/2
- Q&A: Converting From Hydraulic Drum Brakes to Disc Brakes
- Shop: etrailer Rust-Resistant Electric Trailer Brakes - Dacromet - 12" - Left/Right Hand - 5.2K to 7K
- Video: Review of Deutsche Hydrapro CAM Adapter Module Dexter Hydrastar EOH Actuator - DH64FR
- Shop: Brake Controller
- Video: Review of Demco Straight Tongue Trailer Coupler - Standard Coupler - DM13203-95
- Video: Kodiak Disc Brake Caliper Review
- Q&A: Recommended Spare Tire Storage Rack
- Article: Best Boat Trailer Jacks
- Video: Choosing Marine Grade Trailer Brakes
- Q&A: Replacement Disc Brake Parts for a 2023 Continental Dual Axle Boat Trailer
- Q&A: Max PSI on Hydrastar Actuator Included With Hydrastar Disc Brake Kit
Jesse M.
9/8/2025
Hey James, did you decide which brake kit to go with for your trailer? I'd love to know how it worked out for you, as it could help others make a choice between the two kits.