What is Difference Between Uni Servo and Duo Hydraulic Brake Assemblies for Trailer

Question

Question:

Hi, I’m looking to replace the drum brakes on the boat trailer. Not sure what this uni servo is? The brakes on it are hydraulic with the reverse lever/lock out. If the new brakes have a special reverse auto release function built in that is how I interpret the newer brake will this still work on my trailer? I was looking at the item Item # AKFBBRK-7-D. My trailer is a four winns built i. 1993. I look forward to hearing back from you. Thanks

asked by: Graeme W

0

Expert Reply:

Uni servo and duo servo is basically the style of wheel cylinder. It basically puts pressure on either side of the cylinder. The styles are interchangeable so if you have one style over the other you can go with either style.

As long as your drum size is 12 inch and your axles are 5.2k to 7k the part # AKFBBRK-7-D would fit and work well.

expert reply by: Jameson C

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Answer 1

The biggest difference between the servo styles that you'll notice is between free backing plates and the others. The free-backing plates will allow your trailer to back up without having the brakes lock up. With surge brakes typically when you…

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Answer 2

If you replace the current brakes on your trailer with the same uni-servo drum brakes and no lockout actuator (like #T2351000), the brakes will deliver 20 percent braking when traveling in reverse. However, the more pressure you apply going backwards…

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Answer 3

Installation of the etrailer #e27KR will likely interfere with the hands-free liftgate sensor or cause loss of functionality on your 2024 Acura MDX. However, we have had some customers manage to relocate the sensor on their own so it will continue to…

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Answer 4

To determine the size of the brake assemblies you need you have to measure the depth and width of the hub drum on the axle like what you see in the picture I attached. The most common size is 2-1/4 inch wide like the #T4071600-500 that you…

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Answer 5

Surge brakes use a hydraulic actuator to push fluid to the cylinder piston to activate the brake shoes on drum brakes or brake pads on disc brakes. This pressure should only be applied when weight is pushing against the hitch ball, so no pressure…

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Answer 6

The most likely place for brake fluid to be leaking out of your hydraulic brake system is at the fittings or master cylinder. To check the fittings, chock the trailer wheels and back up the trailer so that the brakes engage. With the actuator engaged…

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Answer 7

You can click on the linked page to see all of our complete tandem axle brake line kits. You can select one for your trailer based on its length; we have kits for trailers from 15 to 30-feet. Some kits like #DM5429 use mostly steel lines but we also…

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Answer 8

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 9

It is highly recommended that the spring seat be at minimum tack welded to the axle. There have been issues that have resulted from the seat not be welded to the axle. If you do not have access to a welder, I recommend taking the trailer to a local…

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Answer 10

Trailer wheel bearings are specific to the spindle that is installed on the axle that is on your trailer. You will need to safely support the trailer, remove the wheel and tire, remove the grease cap, remove the cotter pin and washer that secures the…

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Answer 11

Yes, brakes can be added to your trailer and I've linked an article to help with the parts you'll need. The first thing you'll need is the brake mounting flanges welded to the axle, like you mentioned. The correct flange is #4-35 however…

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Answer 12

The Duo-Servo Demco Hydraulic Brake Kit #DMSB18794M-93M fits 10" hub and drum assemblies as well as the same mounting hole dimensions as the Uni-Servo Dexter Hydraulic Trailer Brake Kit #23-312-313. This means that you definitely can replace…

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What is Difference Between Uni Servo and Duo Hydraulic Brake Assemblies for Trailer

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