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Old 05-17-2011, 08:02 PM   #15
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BeBop,

Didn't think of the antilock brakes being part of the problem. I no longer have the instructions that came with the P2 controller, but can access them on line. That would explain the sensation I was feeling. When you said "...adjusting the controller upwards...", I presume you mean increasing the P2 controller gain so the TT brakes lead the TV brakes. Is that correct? Thanks for the suggestion.
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Old 05-18-2011, 12:30 AM   #16
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Im not sure how Toyota wires their system but I just don't see how an electric brake control could affect a disparate system like the hydraulic antilock system? I could see pulsating pedal as the AL system attempts to compensate for the added "push" to the TV...but your brake controller is basically a rheostat for the 12v power being sent to the plug. More voltage out equals greater braking force applied at the trailer. No relationship at all to the TV's braking system.
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Old 05-18-2011, 05:36 AM   #17
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You are over thinking what is almost certainly a warped rotor problem. Take the truck up a mountain - sans trailer - and as you come down, get the brakes good and hot. The hotter they get, the more they'll shake.

After you verify that it is the rotors, go buy new rotors and pads. Don't bother with resurfacing. Make sure the calipers are not sticking. This should be checked both cold and at operating temperatures. AS per ROBERT CROSS, "Don't scrimp." Go with original equipment or better.

Then, learn to manage the heat in the brakes on the truck. Use gearing to slow the truck when you can. Make certain the trailer brake is adjusted properly. Heat is your enemy. Once a rotor is allowed to warp it will only get worse. Resurfacing compromises the rotor even more by removing material and generally means the warp will return sooner than later - especially if put back into the same type of service.
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Old 04-22-2018, 02:34 PM   #18
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Quote:
Originally Posted by BeBop View Post
My rig did the same thing... until I realized my brake controller was not properly adjusted, and due to mis adjustment, was activating the Anti-lock braking system on my tow vehicle... front wheel shudder and all. After adjusting the controller upwards, the shudder disappeared. Seems to be a rather sensitive adjustment... depending on temperature, downward slope, et cetera. Just a perspective.
BAM ! That’s it ! Same EXACT phenom with us ! On same So Cal Cuesta Grade downhill. Thought we blew a tire 1/2 way down ! Grade braking already active from top and lightly braked 1/2 way down 55mph. Never experienced this before even not towing nor on similar (but slightly lesser steep grades). Freaked us out.

TV is newer tech 2014 GMC 1500 with fact int trailer break technology that’s supposed to translate to trailer in tow mode. AS is 25ft 2005 Intl Trailer 5300/6300 and loaded up <@6000. Little water. Gain was set for 4.5 and general traveling.

Must have been gravity making more push on to the TV causing this anti-lock shatter experience generated from/at the TV.

Next time “More Gain on Steep Terrain”.
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