Question re: turbo brake & brake controller - Chevy and GMC Duramax Diesel Forum
Drivetrain Discussion on gearing, CV joints, driveshafts, axles, brakes, etc.

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post #1 of 15 (permalink) Old 05-31-2018, 09:03 AM Thread Starter
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Question re: turbo brake & brake controller

Q for anybody who has the turbo brake activated for towing:

When on a descent, does the braking action of the turbo brake cause the brake controller to activate the trailer brakes (because of the accelerometer in the brake controller)?

I currently have the Prodigy 3p controller. I plan to turn on my turbo brake via the mod (or with a tune) as I've just bought a 10k lb trailer.

I'm considering switching to the DirecLink brake controller from Tuson because that controller is connected directly to the truck's computer, and would only apply trailer brakes when I actually apply the truck brakes with my foot.

I'm concerned that the combination turbo brake and additional trailer braking at the same time may increase the risk of trailer lockup.

Thanks,
Rick
2005 Yukon XL 2500 with 2006 LBZ/Allison drivetrain

2005 Yukon XL 2500 w/2006 LBZ
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post #2 of 15 (permalink) Old 05-31-2018, 09:09 AM
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Two different systems.
Well, with T/H engaged....3 different items to slow the load down;
Grade braking
Turbo braking
P3
All working in unison, and in that order. The P3 being last to take up the slack, as the other two are working before you ever have to hit the brakes.

With your swap conversion, did you also move over the LBZ's brake system?

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post #3 of 15 (permalink) Old 05-31-2018, 09:21 AM Thread Starter
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Actually the controller is a P2.

Yes, the brakes were included in the swap. Everything that makes the truck go/stop is LBZ/Allison.

Isn't the P2 ignorant as to whether I have my foot on the brake pedal, and the accelerometer only senses that the controller is slowing, and how much? Or does the pedal need to be at least a little pressed for the P2 to actually do anything?

My concern is that the P2 wouldn't necessarily be last - it would apply brakes as soon as it felt the rig slowing.

2005 Yukon XL 2500 w/2006 LBZ
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post #4 of 15 (permalink) Old 05-31-2018, 09:55 AM
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No.
Initial controller activation trigger is the 3rd brake light circuit. After that, it's a variable output to the trailer brakes based on G-force detected. Touch the brakes, not much output. Press harder and output increases.
If the grade braking and turbo brake are sufficient to slow you, you don't hit the brake pedal. And when you do, it's much less pressure applied and the controller detects that and lessens output.

If you're trailer brakes are adjusted properly and you have the controller dialed in per the instructions, using the output dial and manual switch, it's all a seamless activation you don't think about.
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2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
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Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
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post #5 of 15 (permalink) Old 05-31-2018, 09:55 AM
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If you have your controller adjusted for the trailer/weight shouldn't be an issue.

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post #6 of 15 (permalink) Old 10-21-2019, 08:06 AM
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Not to hijack, bUt I need to get a brake controller. Leaning toward the Tekonsha p2 or p3.

Looking to get a used airstream travel trailer in the 7300 lb range. 25’

What are the differences in the p2 and p3?

2006 Chevy 2500HD Silverado LT
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Last edited by Planenut; 10-21-2019 at 08:07 AM. Reason: Spelling
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post #7 of 15 (permalink) Old 10-21-2019, 08:38 AM
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Quote:
Originally Posted by Planenut View Post
Not to hijack, bUt I need to get a brake controller. Leaning toward the Tekonsha p2 or p3.

Looking to get a used airstream travel trailer in the 7300 lb range. 25

What are the differences in the p2 and p3?
You cannot hijack a thread that is over a year since the last post.

Tekonsha P3...........https://www.etrailer.com/Brake-Contr...sha/90195.html

P2.........................https://www.etrailer.com/Brake-Contr...sha/90195.html

Look at the Power Boost for Heavy Duty Towing under the P2 description

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post #8 of 15 (permalink) Old 10-21-2019, 09:11 AM
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Quote:
What are the differences in the p2 and p3?
IIRC, the P3 handles EOH brakes, which your Airstream probably doesn't have.

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"
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post #9 of 15 (permalink) Old 10-21-2019, 09:41 AM
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Quote:
Originally Posted by Hook'em_Horns! View Post
IIRC, the P3 handles EOH brakes, which your Airstream probably doesn't have.
The p3 is less expensive, any reason to pay more for the p2?

2006 Chevy 2500HD Silverado LT
LBZ Crew Cab Short Bed 4X4
Speedline H2 Wheels, BFG AT KO2 285/70-17
MBRP downpipe
MBRP 4" ss downpipe back
EFI Live by Idaho Rob with Edge CTS2 and EGT probe
Transgo Jr.
aFe Airbox, lights all on mod, $20 backup camera
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post #10 of 15 (permalink) Old 10-21-2019, 09:50 AM
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Shouldn't be.
The links in post 7 are the same, P3.

The P3 is about $30-$50 more than the P2, which is under $100.

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"
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