Comparing Single Serve and Free Backing Functions on a Demco Free Backing Brake Assembly
Updated 03/05/2014 | Published 03/03/2014
Question:
does the single servo and the free backing model hyd. brakes work the same when backing up?, And how well do they really release when backing up?, Thanks
asked by: Randy
Expert Reply:
Single serve refers to the wheel cylinder in a hydraulic drum brake assembly. It is an entirely separate component from the free backing option. A single serve, or uni-servo, wheel cylinder uses a single plunger to push the brake shoes against the drum.
When you are backing up, the wheel cylinder and the brake shoe springs work against each other. The dual spring and fall-away shoe design of the Demco free backing brakes allows the shoe to overcome the pressure from the wheel cylinder and the pressure is released from the drum.
Because of this, when you back up, you may feel the brakes grab slightly. This is expected and the brakes will release as long as everything is working properly.
Product Page this Question was Asked From
Demco Hydraulic Drum Brake Assembly - Free Backing - Galvanized - 10" - Right Hand - 3,500 lbs
- Accessories and Parts
- Trailer Brakes
- Hydraulic Drum Brakes
- RH
- 3500 lbs
- Brake Assembly
- Free Backing
- 10 x 2-1/4 Inch Drum
- Demco
more information >
Continue Researching
- Shop: Dexter Brake Actuator with Manual Lockout - Bolt On - Drum - 2" Ball - 7,500 lbs
- Shop: Dexter DX7.5L A-60XL Surge Brake Actuator - Drum - 2" Ball - Zinc - 7.5K
- Shop: Hydraulic Trailer Brake Kit - Uni-Servo - Free Backing - 10" - Left/Right Hand - 3,500 lbs
- Search Results: lug nuts
- Q&A: Comparing The Dexter T43397007K And T63FR Brake Actuators
- Q&A: What Free-Backing Hydraulic Brake Assemblies do You Recommend for My 3,500 Pound Axle?
- Q&A: Measurements for Dexter DX7.5L A-60 Brake Actuator
- Q&A: Recommended Replacement Drum Brake Actuator for a Titan Aero 6000
- Q&A: Can Electric Brakes be Used on a Boat Trailer
- Video: Review of the Hydraulic Trailer Brake Kit
- Video: Hydraulic Trailer Brake Kit: The Breakdown
- Video: Hydraulic Trailer Brake Kit Review
- Search Results: axle seal
- Shop: Wiring Kit for Hydrastar Electric Over Hydraulic Actuators
- Shop: Dexter Electric Trailer Brakes - 10" - Left/Right Hand Assemblies - 3.5K
- Shop: Chrome Trailer Wheel Lug Nut - 1/2" - Qty 1
- Shop: Dexter DX7.5L A-60 Brake Actuator - Weld On - Drum - 2" Ball - Raw Metal - 7,500 lbs
- Video: Detailed Breakdown of the Dexter Brake Actuator with Manual Lockout
- Video: Dexter DX7.5L A-60 Brake Actuator Review
- Q&A: How to Find Correct Replacement Hydraulic Surge Brake Actuator for Trailer
- Video: In-Depth Review of the etrailer Bearing Protectors w/ Covers for 1.78" Hub Bore
- Video: Review of the Bearing Buddy Bearing Protectors-BB1980A
- Article: Ram Trailer Tow Prep Package
- Q&A: Is There a Trailer Wiring Harness for a 2017 Mercedes Sprinter 2500 That Has Both 4 and 7-Ways
- Article: How to Tell the Weight Rating of a Trailer Axle
- Article: How to Measure a Trailer Axle
- Article: Wiring Trailer Lights with a 4-Way Plug (It's Easier Than You Think)
- Article: How to Bleed Your Trailer Surge Brakes
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Article: Replacing the Bearing, Races and Seals on a Trailer Hub
on Accessories and Parts
