Comparing Single Serve and Free Backing Functions on a Demco Free Backing Brake Assembly

Question

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

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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.

expert reply by: John H

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Answer 1

Thanks for the pictures. While I do have a replacement for your Titan Aero 6000 actuator I am not 100% positive it will have the same mounting holes. I have linked a diagram below that will give you the measurements to compare to your actuator. I…

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Answer 2

Traditionally, trailer manufacturers did not use electric brakes on boat trailers because the brake magnet wiring and trailer wiring did not always have the best insulation or water protection. These days, more and more manufacturers are using…

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Answer 3

We can certainly help you replace your Atwood Actuator. The Dexter #T43397007K and #T63FR actuators you mentioned are going to be similar in that they are made for trailers with drum brakes and they both will bolt on to a 3" tongue. As far as…

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Answer 4

Hi Gary; with that 3-bolt pattern you need the #T63FR instead of the #DX83FR. This matches your DICO Aero 6000 measurements which can bee seen in the diagram below. It doesn't show your 2.70" measurement but if you use the good old…

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Answer 5

While we do carry the assemblies you need that will not lock when backing up, the Hydraulic Trailer Brake Kit - Uni-Servo - 10" - Left and Right Hand Assemblies - 3,500 #AKUBRK-35 will lock up. For the free-backing version that does not lock up,…

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Answer 6

In order to find out what you need for a replacement actuator you will want to start by finding out what kind of brakes you have. A different brake actuator is needed if you have drum brakes or disc brakes. You will also want to choose a replacement…

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Answer 7

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 8

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 9

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

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Answer 10

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Answer 11

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 12

The Demco Hydraulic Trailer Brake Actuator part #DM72VR should be a direct replacement for the Atwood 61101 Brake Actuator that you have now. This newest updated it rated at 7K instead of 6K. This is a bolt on option that mounts on 3" centers.…

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Comparing Single Serve and Free Backing Functions on a Demco Free Backing Brake Assembly

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