Why Are New Hydraulic Brakes Getting Hot and Smoking

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Question:

I just installed these brakes on my 5200 lb axle with hub drums and adjusted them so that there was a slight amount of drag when spinning them by hand after testing them for about five miles, one of the brakes was smoking and the other was hot but not smoking. Is there a recommended way to adjust them so as to prevent this occurrence? using a brand new Demco surge actuator with all new brake lines as well. Thank you.

asked by: Mark

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Expert Reply:

It sounds like you installed the Demco Hydraulic Brake Kit # 23511-10 correctly but it is possible you may have adjusted them a bit too aggressively, as "slight drag" is subjective, of course. Otherwise there could be an issue with your drum assembly if it is on the older side. If the assembly is at all warped or slightly corroded that can be an issue.

Another problem may be that the hub needs to be properly greased and the bearings packed with Bearing Grease # L11390 and a bearing packer like # PTW1218. If you don't have proper lubrication then the heat can transfer and may be the reason your brakes are running hot.

expert reply by: Kyle S

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Answer 1

Since you need hubs with an 8 on 6-1/2 bolt pattern, the Timbren Axle-Less Suspension System you would need to use is #TASR7KS01, which is rated for 7,000 lbs. The hubs that fit these Timbren's are the Dexter #42866UC3-EZ, and the brakes to go…

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Answer 2

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 3

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 4

To determine the size of the hub assembly you need to purchase you have to determine which bearings are in the old assembly. If the old assembly has L44649 inner bearings, you would use the hub you chose #8-258-5UC1. If the inner bearings are marked…

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Answer 5

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 6

You can convert surge brakes to an electric over hydraulic braking system. To do this, you will need an electric over hydraulic actuator and a brake controller. For an electric over hydraulic actuator, I recommend looking at the Carlisle HydraStar…

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Answer 7

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 8

To find the load capacity for your axle you should look on the trailer VIN plate or sticker that lists the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that…

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Answer 9

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Answer 10

The 5.30-12 tires, being wider, are going to make more contact with the road. This means that the noise, and heat build up will be higher than a 4.80-12 tire but the rolling resistance will actually be less because the tire is larger diameter. The…

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Answer 11

That's a very good question, we tend to be extra cautious and say to use 10 gauge wire because that would be more than enough. When you get into longer trailers that will end up using a lot of wire the heavier gauge wire becomes more necessary.…

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Answer 12

Load range B trailer tires are going to have a lower capacity than C load range tires. Basically that, psi rating, and the ply rating are the only differences. A higher load range tire would last a little longer than lower load ranges of the same…

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Why Are New Hydraulic Brakes Getting Hot and Smoking

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