Trailer Brakes how does the controler work? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



Welcome Enthusiast! If you already own a Chevy TrailBlazer or GMC Envoy or perhaps thinking of purchasing such a vehicle, then you have come to the best TrailBlazer and Envoy site on the net! Rainier, Bravada, Ascender, and 9-7x owners welcome too!

You are currently viewing our site as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to search and post topics, communicate privately with other members, respond to polls, upload content, and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.
Join Today!
Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > Towing

Towing Towing with your TrailVoy

TrailVoy.com is the premier GMC Envoy Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools
  #1  
Old 04-06-2009, 03:00 PM
1builder's Avatar
1builder 1builder is offline
Junior Member
 
2002 Chevy TrailBlazer LTZ
Medium Red Metallic 4.2L I6 4X4
Join Date: Oct 2008
Location: yosemite, CA
Posts: 86
Trailer Brakes how does the controler work?

so i know how the trailer can take the electrical signal and turn it into braking power but how does the controler tell it how much to push and how does it get to the trailer? is it a seperate set of wires in the adapter harness for the trailer lights? new to towing and kinda confused.
__________________
02 chevy TrailBlazer. >250000< miles. thats over 10 1/2 times around the world. i've gone farther than you.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 04-06-2009, 03:28 PM
bartonmd's Avatar
bartonmd bartonmd is offline
Basic Vendor- Skid Plates
 
2007 Chevy TrailBlazer LS
Silverstone Metallic 5.3L V8 4X4
Join Date: Apr 2007
Location: Indianapolis, IN
Posts: 3,698
Quote:
Originally Posted by 1builder View Post
so i know how the trailer can take the electrical signal and turn it into braking power but how does the controler tell it how much to push and how does it get to the trailer? is it a seperate set of wires in the adapter harness for the trailer lights? new to towing and kinda confused.
The power is controlled by what you have to brake controller set to output, when the brake light is on...

There are (3) main kinds of controller

1. Cheap ($65) - On/off controller. Puts out a set voltage (that you set via a slider or dial) to the trailer brakes when the brake lights are on.

2. Accelerometer-based (Prodigy $90, P3 $120) - Have an accelerometer inside them that, (only) when the brake lights are on, varies the brake voltage to the trailer brakes by how fast you're stopping the vehicle.

3. Pressure-based (~$400 - $500) - These actually tap into the brake lines of your vehicle, and have a pressure sensor that supplies a given amount of braking voltage to the trailer brakes, compared to how much pressure is in the lines of the tow vehicle's brakes.

#1 will get you by
#3 is the best, but is $$$
#2 is 98% as good as #3 and the last one I got brand new with warranty off of eBay was $112 shipped

Go Tekonsha P3, if you're buying... I have a thread in this section on how to install it, with pictures.

Mike
__________________
Oil Pan Skid Plate Group Buy Thread
The GB ended, but PM me if you want one!

Bumper and Radiator Skid Plate GB Thread!
GB also ended, but PM me if you want these!
Reply With Quote Quick reply to this message
  #3  
Old 04-06-2009, 03:29 PM
the roadie's Avatar
the roadie the roadie is offline
No longer with us
 
2004 GMC Envoy SLT "Roadiemobile"
Extreme Offroad Pewter 4.2L I6 4X4
Join Date: Apr 2005
Posts: 26,181
The wiring is already built into the 7-pin connector at the back, but not, or course, the controller. That needs four wires to hook up to the vehicle, which are curled up and electrical taped together near the driver's left foot above the lower dash panel.

The controller uses +12 and ground for power. It gets a brake signal from the pedal switch, and its output wire goes straight back to the 7-pin connector at the rear. That's all four wires.

Electronically, the controller needs to put out a signal that varies from zero to 12 volts according to how much braking power it concludes that you want. Most controllers have tiny pendulums inside, or nowadays electronic sensors, to measure the g-force of the vehicle's deceleration. How hard YOU press on the brakes determines how much g-force you get for deceleration. SO the controller knows when to START slowing down the trailer by when you press the brake, and it knows how HARD you want to brake by the deceleration it measures.

The secret here is there is a BALANCE or proportional control on the controller that you have to adjust as you start driving with it. If the trailer has too little braking force in relation to the vehicle, then the vehicle will do too much of the work. If the controller is set too sensitively, then the slightest brake pedal pressure will lock up the trailer brakes and it will do all the work. Both extremes are bad. Finding the best compromise will take you a few minutes with the controller, and these things are ALL explained very well on the Tekonsha site and in the instructions for the controller. Many of us have the Tekonsha Prodigy.

There is also a threshold adjustment to make sure the brakes of the trailer are on slightly even at a stop light when you aren't moving or decelerating. Two adjustments - that's all.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum forums, you must first register.

Please enter your desired user name, your email address and other required details in the form below.
(Only letters, numbers, dashes and underscores are permitted for user names)
The user name that you choose is permanent and can never be changed.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


» Sponsors

Advertising Info

All times are GMT -4. The time now is 03:59 PM.


Chevy TrailBlazer and GMC Envoy Enthusiasts - Copyright 2004 - 2009 All Rights Reserved.
All trademarks referenced herein are property of their respective owners.
RSS Feed