RockyMtnRay
Senior Member
How do they work? Which ones are dangerous?
The ideal goal for a brake controller is to provide trailer braking that's completely proportional to how hard you are braking the tow vehicle, and to do it under all conditions. As you will see below, some controllers (the expensive ones) achieve this ideal; the very inexpensive ones don't even come close.
There are 4 types of technology commonly used in brake controllers:
1. At the very low end are the "time delay" controllers. These use a very simple, very stupid, and very dangerous circuit that increases current to the trailer brakes proportional to how long you hold the brake pedal down, but do not respond to how hard you push it. In a panic braking situation, they provide almost no trailer braking during the first critical seconds; OTOH in traffic where you frequently are using long periods of light braking, they will ramp trailer braking up to the maximum after several seconds ... and that causes excessive trailer braking and a lot of jerking. IMHO this is a downright dangerous device that should be banned from the market. Aficiondos of time delay controllers often argue that their proclivity to provide too little braking on the highway and too much braking in the city can be dealt with by adjusting the delay (also called ramp time), and/or "gain" (also called ramp rate) ... and the makers of these devices make a big issue of how easily they can be adjusted while you're driving. To which I say that first of all, a truly good controller will self-adjust for conditions, and secondly the last thing I want to be mucking with in a panic braking situation is the gain on my trailer brake controller. Time delay controllers have one thing going for them - they are cheap. New owners often choose them on the basis of price alone, and so on that basis, they remain on the market.
2. [deleted - no longer offered]
3. A significant step up are those that use dual solid state accelerometers to measure both the effects of gravity and the effects of deceleration. Sometimes called "self leveling inertia controllers", these use advanced circuits to determine which direction is "down", regardless of how they're mounted and how steep the grade is ... so they always provide exactly the right amount of trailer braking. The prime example of this type of controller is the Tekonsha Prodigy which retails anywhere from about $110 to $150. This is the controller I have and find it works superbly for mountain towing. It never needs to be adjusted to accomodate different situations (just set and forget), never causes jerking of the trailer, can be mounted at almost any angle, and is not affected at all by steep mountain grades. It has no moving parts, so it should be extremely reliable.
4. [deleted - no longer offered]
Since the difference in price between the truly bad time-delay controllers and the very good controllers like the Prodigy is less than $100 ... but the difference in safety and smoothness of trailer braking is immense ... the intelligent choice is to spend a bit more to get a whole lot more.
The ideal goal for a brake controller is to provide trailer braking that's completely proportional to how hard you are braking the tow vehicle, and to do it under all conditions. As you will see below, some controllers (the expensive ones) achieve this ideal; the very inexpensive ones don't even come close.
There are 4 types of technology commonly used in brake controllers:
1. At the very low end are the "time delay" controllers. These use a very simple, very stupid, and very dangerous circuit that increases current to the trailer brakes proportional to how long you hold the brake pedal down, but do not respond to how hard you push it. In a panic braking situation, they provide almost no trailer braking during the first critical seconds; OTOH in traffic where you frequently are using long periods of light braking, they will ramp trailer braking up to the maximum after several seconds ... and that causes excessive trailer braking and a lot of jerking. IMHO this is a downright dangerous device that should be banned from the market. Aficiondos of time delay controllers often argue that their proclivity to provide too little braking on the highway and too much braking in the city can be dealt with by adjusting the delay (also called ramp time), and/or "gain" (also called ramp rate) ... and the makers of these devices make a big issue of how easily they can be adjusted while you're driving. To which I say that first of all, a truly good controller will self-adjust for conditions, and secondly the last thing I want to be mucking with in a panic braking situation is the gain on my trailer brake controller. Time delay controllers have one thing going for them - they are cheap. New owners often choose them on the basis of price alone, and so on that basis, they remain on the market.
2. [deleted - no longer offered]
3. A significant step up are those that use dual solid state accelerometers to measure both the effects of gravity and the effects of deceleration. Sometimes called "self leveling inertia controllers", these use advanced circuits to determine which direction is "down", regardless of how they're mounted and how steep the grade is ... so they always provide exactly the right amount of trailer braking. The prime example of this type of controller is the Tekonsha Prodigy which retails anywhere from about $110 to $150. This is the controller I have and find it works superbly for mountain towing. It never needs to be adjusted to accomodate different situations (just set and forget), never causes jerking of the trailer, can be mounted at almost any angle, and is not affected at all by steep mountain grades. It has no moving parts, so it should be extremely reliable.
4. [deleted - no longer offered]
Since the difference in price between the truly bad time-delay controllers and the very good controllers like the Prodigy is less than $100 ... but the difference in safety and smoothness of trailer braking is immense ... the intelligent choice is to spend a bit more to get a whole lot more.
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