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Old 04-30-2012, 09:55 PM   #1
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Trailer Brake Gain on GM trucks

Could someone please, with a newer GM and approx same trailer as us, tell me what your trailer brake gain is. On our other GMC it was set at 4.5 for a 28RKBS approx. weight of 9500lbs. The new trailer is giving us brake grief and to get anything that holds the trailer at a stand still I have to have the gain at 8. It's been back to the dealer and they have been a little helpful but not much. My understanding of the set up is to drive 30kph to 40 kph to set up and have done that. My concern is that even at a 10 setting I cannot lock up the trailer brakes
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Old 04-30-2012, 10:11 PM   #2
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The rv dealer set mine up at 4.0 & seems to be about perfect. Tv is a 2012 1500 & trailer is around 7600lbs. They said most of the gm brake controllers they set is usually 3-4.
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Old 04-30-2012, 10:36 PM   #3
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From the GM service manual, with the motor running, gain set to 10.0, have someone apply the trailer brakes manually, voltage at the plug, ground to brakes, 12-14 volts
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Old 04-30-2012, 10:57 PM   #4
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Thanks Mike, that was checked and the voltage was fine.
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Old 04-30-2012, 11:07 PM   #5
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The issue could be that the brakes on the camper need to be adjusted.

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Old 04-30-2012, 11:14 PM   #6
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That's what I was thinking Dave.
Trailer brakes out of adjustment .
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Old 04-30-2012, 11:18 PM   #7
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Just picked it back up....again...from the dealer. Says all is well. I think not but I'm at wits end here. It is better then it was but not as I think it should be, as I said in the first post.
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Old 04-30-2012, 11:30 PM   #8
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Mine were that way at first and after about the 3rd trip when they set it would almost throw u through the window!
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Old 04-30-2012, 11:49 PM   #9
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I have integrated GM controller. I had to set at 8 or 8.5 for 8500 lb 5er. I just performed a brake adjustment and I get same braking at 4.5 to 5.
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Old 05-01-2012, 12:47 AM   #10
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Before I traded my 2500HD D/A I was usually at 3.5 and it worked perfectly.
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