Availability of Free-Backing 3,500 lb Drum Brake Assemblies
Updated 09/12/2025 | Published 08/16/2025
Question:
Hi, I want to replace my trailer brakes on a 25 YO 3500 2 axle trailer with hydraulic drum brakes on front. They are 10X2 1/4 pad size Can I use free backing brakes? I do not have any back up devices.
asked by: David
0
Expert Reply:
Hey David, yes you can go with a set of free-backing plates like the Demco Hydraulic Trailer Brakes # 40716-15 that you referenced. These are correct for a 3,500 lb axle like you have as well. Does your surge actuator not have a reverse lock out?
expert reply by:
Jameson C
0
Product Page this Question was Asked From
Demco Hydraulic Trailer Brakes - Free Backing - Galvanized - Left/Right - 10" - 3.5K
- Trailer Brakes
- Hydraulic Drum Brakes
- Marine Grade
- Free Backing
- Manual Adjust
- Single Servo
- 10 x 2-1/4 Inch Drum
- 3500 lbs Axle
- 14 Inch Wheel
- 14-1/2 Inch Wheel
- 15 Inch Wheel
- Demco
more information >
Continue Researching
- Video: Feature Breakdown: Demco Hydraulic Brake Kit
- Video: Review of etrailer Trailer Brakes - Hydraulic Drum Brake Kit - AKFBBRK-35-D
- Q&A: Can Disc Brake Actuator be Used with Trailer Drum Brakes
- Q&A: How to Choose Replacement Axle for 1999 Eagle Boat Trailer
- Q&A: 4 Hole Brake Mounting Flange Dimensions for 10 Inch Brake Assembly
- Q&A: Does My 1998 Eagle Boat Trailer With Tandem Axles Have Hydraulic or Electric Trailer Brakes?
- Q&A: Comparing Free Backing and Duo Servo Hydraulic Brake Assemblies
- Video: An In-Depth Look at the Kodiak Hydraulic Brake Hose
- Q&A: Can Drum Brake Actuator Be Used Temporarily on Trailer with Disc Brakes
- Shop: Demco Hydraulic Trailer Brakes - Uni-Servo - Galvanized - 10" - Left/Right - 3.5K
- Shop: Grease/Oil Seals - Double Lip - I.D. 2.125" / O.D. 3.376" for 5.2K to 7K Axles - Qty 2
- Shop: Timken 473336 Grease and Oil Seal - Double Lip - I.D. 1.719" / O.D. 2.565" for 3.5K Axles
- Search Results: spare tire mount
- Search Results: accessories and parts
- Search Results: bearing kits trailer bearings races seals caps
- Shop: Kenda Karrier KR53 ST205/75R15 Radial Trailer Tire with 15" Black Mod Wheel - 5 on 4-1/2
- Shop: Brophy Trailer Stake Pocket Spare Tire Mount - Black Powder Coat
- Shop: Timken Bearing Kit, LM67048/25580 Bearings, LM67010/25520 Races, 412920 Seal
- Shop: Extra Offset Trailer Spare Tire Mount by Dutton-Lainson
- Shop: Trailer Hitch
- Search Results: trailer hitch
- Video: Firestone Ride-Rite Air Bags with Easy Mount Compressor Feature Breakdown
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Article: Trailer Wiring Diagrams
- Shop: Trailer Wiring
- Search Results: trailer tires and wheels
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Video: Review of etrailer Trailer Hubs and Drums - Hub with Drum - AKHD-545-35-EZ-K
- Search Results: trailer wiring
- Shop: Suspension Enhancement
Explore Expert Info
![Our Expert]()
on Trailer Brakes
on Trailer Brakes
Jameson C.
9/12/2025
Hey David, did you find out if your surge actuator has a reverse lockout? If you're still working on this, I'm happy to help!