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Open Roads Forum  >  Towing

 > brake control

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bartiee

Amherstburg

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Posted: 04/08/12 10:01am Link  |  Print  |  Notify Moderator

Question. When the trailer brakes are connected to the tow vehicle and U manually apply the lever on the control, should the trailer brakes lock up?

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* This post was edited 04/08/12 10:59am by an administrator/moderator *


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ScottG

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Posted: 04/08/12 10:31am Link  |  Print  |  Notify Moderator

They should but mine never have on my present TT.


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leewain

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Posted: 04/08/12 10:40am Link  |  Print  |  Notify Moderator

I have the prodigy controller on my Chev and pull a 32' 5th wheel. If I turn roll the power up to max and slide the manual lever, I can lock my brakes on the trailer. If I am on pavement, I can barely move, if I am on gravel, grass or alike, I can slide the trailer with the wheels locked. I suggest you check the manual for yours and understand the adjustments on the controller. If the trailer brakes are functioning properly(magnets & shoes), you should be able to lock the brakes.

wittmeba

Virginia

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Posted: 04/08/12 11:28am Link  |  Print  |  Notify Moderator

According to Dexter Brakes - no not always. It will be dependent on the brake quality, adjustment, brake controller voltage output, road surface conditions and tires.

My opinion is they should when every element is as good as it can get, they should. If they dont you never know if at max braking demand if you are getting 95% or 60% or less.

Probably the best test is get onto some semi-gravel surface and if you can lock them up, they are probably pretty close to the best you will get.


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jerem0621

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Posted: 04/08/12 11:36am Link  |  Print  |  Notify Moderator

NO!

Part of the set up of my Tekonsha says if the trailer breaks lock up then back off the power just before the trailer brakes lock up.

You do not want the brakes locked up in an emergency.

Thanks!

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BenK

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Posted: 04/08/12 12:16pm Link  |  Print  |  Notify Moderator

There are over 13 pages from a quick search using : 'trailer brake lock up'

Bottom line advice is to check (read and understand) your brake controller manual
Not all are the same and specific's to each one via their manual

I set up my P3 to skid the trailer brakes going about 25MPH. It won't
skid going faster, as the brakes need more power to skid at higher
speeds

Here are just a few of those threads:

Travel trailer braking problem


Electric brake issues


Electric brake issues



"newbie" mistakes


P3 Question...


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Praise Dyno Brake equiped and all have "nose bleed" braking!
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Posted: 04/08/12 12:52pm Link  |  Print  |  Notify Moderator

Some trailer brakes will lock under full battery voltage, and some will not.

According to Dexter Axle:

On an unloaded trailer, you may be able to lock up your brakes
if your electric brake controller is supplying full amperage to the brakes.
When loaded to capacity, you may not be able to lock your brakes
as electric brakes are designed to slow the trailer at a controlled rate,
and not designed to lock up the wheels on a fully loaded trailer.


Ron

Chuck_S

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Posted: 04/09/12 05:23am Link  |  Print  |  Notify Moderator

The best bet is to read the instructions that came with your brake controller.

With a "smart" proportional controller such as the Tekonsha Prodige P2 or P3 the brakes should almost but NOT QUITE lock up at 25mph (with warm brakes). On cheap, time delay controllers it's anyone's guess.

If you don't have electric brake control built into your truck the ONLY controller I'd get is the Prodigy P2 or P3.

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wittmeba

Virginia

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Posted: 04/09/12 08:59am Link  |  Print  |  Notify Moderator

Id like to see a brake controller that offers sensitivity adjustment much like that of a stereo with independent His - mids - lows adjustment.

The Low would be for slow in traffic crawling like you do so much in Pigeon Forge.

The Mid would be normal city and mild highway driving.

The High would be to apply the max output your brake system can provide. Emergency stops.

These should be individual adjustments. As they are now, when you set your braking for good stopping abiliby at highway speeds it seems to provide a little too much braking at slower speeds.

Allow the driver to tune the shape of the voltage output ramp.

BenK

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Posted: 04/09/12 10:28am Link  |  Print  |  Notify Moderator

wittmeba wrote:

Id like to see a brake controller that offers sensitivity adjustment much like that of a stereo with independent His - mids - lows adjustment.

The Low would be for slow in traffic crawling like you do so much in Pigeon Forge.

The Mid would be normal city and mild highway driving.

The High would be to apply the max output your brake system can provide. Emergency stops.

These should be individual adjustments. As they are now, when you set your braking for good stopping abiliby at highway speeds it seems to provide a little too much braking at slower speeds.

Allow the driver to tune the shape of the voltage output ramp.


This is the 'boost' feature on my P3

Dial in it's sensitivity to which ever trailer brake system am towing
that day

There is one trailer that my P3 will NOT skid the brakes and I've super
tuned that trailer's brakes to boot

As for the various conditions, yes, none to my knowledge (to date), but
that is most likely just over the horizon, but I'm not into too much
complexity for this kind of stuff

Background in industrial controls from fractional to +10,000HP main
propulsion (ship board).

I like to keep it simple (KISS) as much as possible.

The new OEM brake controllers are so integrated, that it can setup
a counter sway in the TV to negate the one going on at the trailer
That the brake controller can hiccup and cause ABS and/or traction
control to south with no recourse...at that moment

Not for me, as know all things do age and need recalibration over time

That all things have failure modes and want to keep each circuit alone
to allow the others to do their thing in case one computer goes mad or
gets a 'bad' or 'wrong' sensory input

But my P3 is manageable in the area you speak

Set the boost for <25MPH to skid the trailer brakes, but not enough to
do so above 25MPH, but then there is a sensor that senses deceleration
that then does some simple math according to whatever DB look up tables
to adjust the amount of power to the trailer brakes

My assumption is that those look tables references the basis (the
preset boost you dialed in) that then adjusts the level of boost sent
to the trailer brakes above 25MPH factored by the rate of TV
deceleration being sensed.

There is a manual override...that manual button/lever/etc

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