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Old 05-25-2020, 02:35 AM   #1
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Brakes

Brakes seem weak and are not wearing.
Tandem axle 4 wheels
12x2
Adjusted annually
Inspected annually/ No grease noted on brake shoe/ or magnet surface.
What gauge wire is routed to your brakes?
I get 2.69A / wheel at brake application, what is normal?
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Old 05-25-2020, 02:01 PM   #2
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This document should help:
https://www.dexteraxle.com/docs/defa...s.pdf?sfvrsn=0

You need to check voltage as well as amperage.
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Old 05-25-2020, 02:04 PM   #3
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What do you have for a tow vehicle?
My Ford has three different intensity settings for the brakes.
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Old 05-25-2020, 02:21 PM   #4
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Quote:
Originally Posted by mfMcFroggierPod View Post
Brakes seem weak and are not wearing.
Tandem axle 4 wheels
12x2
Adjusted annually
Inspected annually/ No grease noted on brake shoe/ or magnet surface.
What gauge wire is routed to your brakes?
I get 2.69A / wheel at brake application, what is normal?
It sounds like you only have one magnet working. According to Dexter each magnet draws around 3 amps and you then multiply that by the number of brake assemblies, in your case four.

A common cause of this problem is the connectors where the main brake wire is attached to the individual wires from the brake magnets.

I would check current at each brake backing plate with a clamp type ammeter with controller gain set to max and manually applied.


Another cause of poor braking if all else is working properly is glazed brake shoes. While drums are off just use a sanding block with some medium/coarse sandpaper to remove the glaze. Sand along the shoe lining, not across it which can leave flat spots. Glazing can occur when frequent and light braking is done on tow vehicle and gain is set low on controller. Once brake pedal is touched, brakes on trailer are activated but not enough to do much more than glaze the linings. Turn up gain and avoid unnecessary application of brakes. Coast to a slower speed when possible rather than using brakes.
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Old 05-25-2020, 02:21 PM   #5
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Each brake magnet is slightly less than 4Ω which means 4 in parallel will be little less than 1Ω. That means with 13V, the current will be over 13A.

You can measure the resistance at your 7 pin trailer plug to ground to verify that you are less than 1Ω.

When I bought my trailer, the brakes didn't work well. I went through the burnishing procedure of going 25MPH and manually applying brakes fully for around 15 times, cooling in between stops. The brakes worked great after that.
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Old 05-25-2020, 03:57 PM   #6
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I get 2.69A at each wheel 10.76A total
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Old 05-25-2020, 04:00 PM   #7
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I get 2.69A at each wheel 10.76A total
The amount of current will depend on the amount of voltage you are feeding it. Do you have the gain of your controller set to max when you measure this? You can also just pull the pin on the breakaway and measure current as well.

However, it does sound like the magnets are working properly. Probably glazed shoes like TitanMike said or they just need to be burnished.
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Old 05-25-2020, 04:13 PM   #8
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This was measured with the breakaway pin pulled.
What grit sandpaper?
Is the sanding a temporary fix if they are glazed?
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Old 05-25-2020, 04:15 PM   #9
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Voltage lower Amperage up.
Just seem low to the 3A/12A...
Trailer brake line is 14g.
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Old 05-25-2020, 05:15 PM   #10
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I measured the resistance at the 7 pin connector; 1.3 oHms.
This means?
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Old 05-25-2020, 06:14 PM   #11
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According to the chart in the document I posted from Dexter axles/brakes, if hitch to axle is 30 ft or less you should have 12 gauge wire. Over 30 you need 10 gauge wire.

It seems like what you are measuring for amps and resistance is about right for having only 14 gauge wire.
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Old 05-25-2020, 06:52 PM   #12
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So does this mean: electrically thing are normal and it is probably a mechanical issue like glazed brakes as mentioned?
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Old 05-25-2020, 07:12 PM   #13
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You have not measured what is coming out of your brake controller, as near as I can tell. I don't think you have even mentioned what make/model it is, or what it is set at.
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Old 05-25-2020, 07:23 PM   #14
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2500 Chevy 6.6L
Prodigy P1 or P2
Electric controller only
Set at B2 8.5
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Old 05-25-2020, 07:25 PM   #15
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Silverado
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