Electric Trailer brake question - Chevy and GMC Duramax Diesel Forum
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post #1 of 12 (permalink) Old 10-25-2016, 10:36 AM Thread Starter
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Electric Trailer brake question

I need a little help.
I have a 2-axle aluminum horse trailer with electric brakes on all 4 wheels. In the way home from a rodeo on Sunday, while stopping at a stop light I looked back and noticed a lot of black smoke coming from the trailer tires. The smoke stopped when I let off of the brakes. I got pulled over at a gas station and noticed that the front tire on the passenger side of the trailer had a flat spot on it where it had been sliding. Obviously, the brake on that wheel had locked up while braking. The others seem to be operating properly. This came on all at once; it was not a gradual change. I don't know a lot about electric brakes so I was hoping for a little advice from some of you that are a lot smarter than me.
What are some things I could check out that could be causing only one out of the four wheels to lock up when the brakes are applied?
Thanks,
Doc

2018 White Sierra CC SB 2500HD Z71; Banks Derringer & iDash

CP4 failure: 2015 GMC [/B][/B]Denali SRW 3500HD 4x4[/COLOR][/B][/FONT]
ppei; 5" Flo-Pro Straight[/SIZE], 125k
Sold: '15 Silverado LTZ CC SB Z-71 4x4,
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post #2 of 12 (permalink) Old 10-25-2016, 11:13 AM
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Jack trailer up on side with bad tire.See if it's sticking,not spinning freely.Rock tire at 3-6 o'clock,6-12,tells if wheel is loose or bad bearing.If all looks good then put the breaks on while jacked up.If bad tire won't spin but the other does,tells you your break pads are sticking,remove hub for inspection of pads and inside wall of hub.Well it could mean more but for you that's what I'd do.
Now if the pads are spreading out to hub they might need backed off so they don't lock up on you while breaking.Thats if you have drum breaks.Id suggest getting a mechanic to inspect them now and every 1k miles on straight runs or before every big trip.All depends on how often and mileage you do.All 4 need it be breaking the same,greased regularly and pads/hubs don't last forever.Thats what I'd look at but there are more variables

16 GMC Denali 3500 stock for now

Last edited by Scott1979; 10-25-2016 at 11:27 AM.
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post #3 of 12 (permalink) Old 10-25-2016, 11:27 AM
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What was the trailer gain set at?
Was the trailer lighter on the return trip?
Was most of the weight in the driver side?
Is the trailer level?
Pavement damp?

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2012 CC/SB 2500HD LML LTZ Blk/Blk PPEI tuned & deleted ~Traded~

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post #4 of 12 (permalink) Old 10-25-2016, 11:30 AM Thread Starter
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Quote:
Originally Posted by Scott1979 View Post
Jack trailer up on side with bad tire.See if it's sticking,not spinning freely.Rock tire at 3-6 o'clock,6-12,tells if wheel is loose or bad bearing.If all looks good then put the breaks on while jacked up.If bad tire won't spin but the other does,tells you your break pads are sticking,remove hub for inspection of pads and inside wall of hub.Well it could mean more but for you that's what I'd do.
Now if the pads are spreading out to hub they might need backed off so they don't lock up on you while breaking.Thats if you have drum breaks.Id suggest getting a mechanic to inspect them now and every 1k miles on straight runs or before every big trip.All depends on how often and mileage you do.All 4 need it be breaking the same,greased regularly and pads/hubs don't last forever.Thats what I'd look at but there are more variables
Thanks, I will try it and see how it goes.

2018 White Sierra CC SB 2500HD Z71; Banks Derringer & iDash

CP4 failure: 2015 GMC [/B][/B]Denali SRW 3500HD 4x4[/COLOR][/B][/FONT]
ppei; 5" Flo-Pro Straight[/SIZE], 125k
Sold: '15 Silverado LTZ CC SB Z-71 4x4,
All stock
Sold: '11 Silverado LTZ CC SB Z-71 4x4,
MiniMaxx w/ delete package
Sold: '07 Silverado LT2 CC SB 4x4 LBZ/Ally, 206k
KD Performance/Tow Tune, 4" MBRP
Sold: '05 GMC SLE CC SB 4x4 LLY/Ally, 45k, Predator
Sold: '02 Silverado LS EC 4x4 LB7/Ally
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post #5 of 12 (permalink) Old 10-25-2016, 11:33 AM Thread Starter
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Quote:
Originally Posted by TDavis1992 View Post
What was the trailer gain set at?
Was the trailer lighter on the return trip?
Was most of the weight in the driver side?
Is the trailer level?
Pavement damp?

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The load was exactly the same on a dry road both ways. Never had this problem before.
Boy I wish I could see a wet road. It has been dry here!

2018 White Sierra CC SB 2500HD Z71; Banks Derringer & iDash

CP4 failure: 2015 GMC [/B][/B]Denali SRW 3500HD 4x4[/COLOR][/B][/FONT]
ppei; 5" Flo-Pro Straight[/SIZE], 125k
Sold: '15 Silverado LTZ CC SB Z-71 4x4,
All stock
Sold: '11 Silverado LTZ CC SB Z-71 4x4,
MiniMaxx w/ delete package
Sold: '07 Silverado LT2 CC SB 4x4 LBZ/Ally, 206k
KD Performance/Tow Tune, 4" MBRP
Sold: '05 GMC SLE CC SB 4x4 LLY/Ally, 45k, Predator
Sold: '02 Silverado LS EC 4x4 LB7/Ally
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post #6 of 12 (permalink) Old 10-25-2016, 11:48 AM
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You skipped a couple questions there boss.

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2012 CC/SB 2500HD LML LTZ Blk/Blk PPEI tuned & deleted ~Traded~

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post #7 of 12 (permalink) Old 10-25-2016, 11:51 AM Thread Starter
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Quote:
Originally Posted by TDavis1992 View Post
What was the trailer gain set at?
- 4.0, same as it has been for a while
Was the trailer lighter on the return trip?
- no
Was most of the weight in the driver side?
- no
Is the trailer level?
- yep
Pavement damp?
- no

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Was the trailer lighter on the return trip?
- no
Was most of the weight in the driver side?
- no
Is the trailer level?
- yep
Pavement damp?
- no

2018 White Sierra CC SB 2500HD Z71; Banks Derringer & iDash

CP4 failure: 2015 GMC [/B][/B]Denali SRW 3500HD 4x4[/COLOR][/B][/FONT]
ppei; 5" Flo-Pro Straight[/SIZE], 125k
Sold: '15 Silverado LTZ CC SB Z-71 4x4,
All stock
Sold: '11 Silverado LTZ CC SB Z-71 4x4,
MiniMaxx w/ delete package
Sold: '07 Silverado LT2 CC SB 4x4 LBZ/Ally, 206k
KD Performance/Tow Tune, 4" MBRP
Sold: '05 GMC SLE CC SB 4x4 LLY/Ally, 45k, Predator
Sold: '02 Silverado LS EC 4x4 LB7/Ally
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post #8 of 12 (permalink) Old 10-25-2016, 11:56 AM
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Sounds like they are adjusted differently. I'd disassemble the skidding one and inspect. The adjust all 4 and see what gives.

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post #9 of 12 (permalink) Old 10-26-2016, 02:05 PM Thread Starter
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Thanks Guys,
I plan to get started on it tonight! I'll let you know how it turned out in a day or 2.

2018 White Sierra CC SB 2500HD Z71; Banks Derringer & iDash

CP4 failure: 2015 GMC [/B][/B]Denali SRW 3500HD 4x4[/COLOR][/B][/FONT]
ppei; 5" Flo-Pro Straight[/SIZE], 125k
Sold: '15 Silverado LTZ CC SB Z-71 4x4,
All stock
Sold: '11 Silverado LTZ CC SB Z-71 4x4,
MiniMaxx w/ delete package
Sold: '07 Silverado LT2 CC SB 4x4 LBZ/Ally, 206k
KD Performance/Tow Tune, 4" MBRP
Sold: '05 GMC SLE CC SB 4x4 LLY/Ally, 45k, Predator
Sold: '02 Silverado LS EC 4x4 LB7/Ally
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post #10 of 12 (permalink) Old 10-27-2016, 12:47 PM Thread Starter
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Well I got everything apart last night and everything looked OK. The brake was engaging properly, but would not disengage when the brake pedal was released until I rolled the hub in reverse. I adjusted the caliper and didn't notice much of a change. I took the back tire off and it seemed to be doing about the same (but it was not locking up like the front one. I put it all back together and everything seems to be working as it should in my driveway but I wasn't able to do a road test. Maybe tonight.
My next question is; should the wheel "freewheel" immediately when the brake is released or should there still be some resistance?
Doc

2018 White Sierra CC SB 2500HD Z71; Banks Derringer & iDash

CP4 failure: 2015 GMC [/B][/B]Denali SRW 3500HD 4x4[/COLOR][/B][/FONT]
ppei; 5" Flo-Pro Straight[/SIZE], 125k
Sold: '15 Silverado LTZ CC SB Z-71 4x4,
All stock
Sold: '11 Silverado LTZ CC SB Z-71 4x4,
MiniMaxx w/ delete package
Sold: '07 Silverado LT2 CC SB 4x4 LBZ/Ally, 206k
KD Performance/Tow Tune, 4" MBRP
Sold: '05 GMC SLE CC SB 4x4 LLY/Ally, 45k, Predator
Sold: '02 Silverado LS EC 4x4 LB7/Ally
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