Trailer brake controllers
Which trailer brake controller should you buy?
A brake controller sits between your brake pedal and the trailer's electric brakes, sending them a signal proportional to how hard you are actually stopping. Without one, a braked trailer either has no brakes at all or brakes at a fixed setting regardless of how gently or hard you are slowing down, and either way the tow vehicle is doing more of the stopping than it should.
The picks below split on one real distinction: proportional controllers, which read an accelerometer and match your actual deceleration, against time delay controllers, which ramp to a preset regardless of how hard you are braking. Proportional is the better technology at every price point it is available at; time delay exists because it is cheaper to build, not because it works better.
Trailer brakes are legally required above a threshold that varies by state, commonly somewhere between 1,500 and 5,000 lb, and there is no single federal number. Check your own state DMV or DOT and the weight on your trailer's certification label rather than a chart, because a table trying to cover every state would be wrong for most readers using it.
On this page
- Proportional or time delay, what is the real difference?
- How we chose
- Beginner: a first controller, occasional towing
- Intermediate: proportional, for almost anybody
- Expert: multi-axle, hidden mount, or manual override you can trust
- Which controller fits which install?
- Is a brake controller legally required?
- How do you set the gain once it is installed?
Proportional or time delay, what is the real difference?
A proportional controller uses an internal accelerometer to read exactly how hard the tow vehicle is decelerating and sends the trailer brakes a matching signal in real time. A time delay controller has no sensor for that; it ramps trailer braking to a preset level over a fixed time whenever the brake pedal is pressed, whether you are slowing gently in traffic or stopping hard for a deer. That means a time delay controller can under-brake the trailer on a hard stop and over-brake it on a gentle one, on the same trip, with no way to tell it apart from the driver's seat.
The CURT Venturer Next is a time delay controller, included here because it is a genuine functional step down for a real price saving on a light trailer towed occasionally. Every other controller on this page is proportional.
How we chose
We did not install or tow with any of these ourselves. Picks come from the manufacturer's published controller type, axle support and mounting method, checked against verified owner reviews. Searching this category also returns a wall of listings whose own titles say "compatible with Tekonsha 90160" or "replaces 8508211", priced well under the real unit. They are copies of a specific product named by the thing they copy, and the part they copy is the one that stops the trailer, so none of them are catalogued here.
Beginner: a first controller, occasional towing
The lowest real cost of adding a functioning controller to a truck that has none.
CURT Venturer Next Electric Trailer Brake Controller, time delay, 1 to 3 axles
$76.11The cheapest controller here from a maker with a real service path. It is time delay rather than proportional, an acceptable trade for a light trailer towed a few times a year.
Check before buying: Time delay is a genuine functional step down from proportional. The trailer brakes come on at the same rate whether you are slowing gently or stopping hard.
Best for: A light trailer, towed a few times a year, on a budget.
Check price on AmazonIntermediate: proportional, for almost anybody
The controller most trucks adding one for the first time should actually buy.
Tekonsha Primus IQ Proportional Brake Controller, 1 to 3 axles
$157.99 Published ratingsProportional braking with a self-levelling sensor and a boost setting for a heavy trailer, at a price the whole category gets compared against.
Best for: Almost anybody adding a controller to a truck that does not have one built in.
Check price on Amazon
CURT Echo Mobile Bluetooth Trailer Brake Controller, 7-way, 1 to 2 axles
$289.95 Published ratingsPlugs in between the truck and trailer 7-way connectors with no wiring at all, and moves between vehicles in seconds.
Check before buying: Manual override lives in the phone app on the base unit, which is not where you want it when a trailer starts to sway. The Echo Kit adds a physical override button and is the version to buy for that reason.
Best for: Towing with a vehicle you do not own, or with more than one vehicle.
Check price on AmazonExpert: multi-axle, hidden mount, or manual override you can trust
The controllers built for a specific install problem rather than a general one.
Tekonsha Prodigy iD Brake Controller, 1 to 4 axles
$229.99 Published ratingsConfigured from a phone rather than a two button interface, and supports four axles, which matters on a triple axle fifth wheel or a heavy equipment trailer.
Best for: A four axle trailer, or somebody who tows several trailers and wants saved profiles.
Check price on Amazon
REDARC Tow-Pro Liberty Electric Trailer Brake Controller, 1 to 2 axles
$190.00 Published ratingsA single knob that mounts flush in a blank switch panel, with the electronics hidden behind the dash, for a modern truck with no room for a brick.
Best for: A vehicle with no space for a conventional controller.
Check price on Amazon
CURT Echo Kit, Bluetooth Brake Controller with Manual Override Button
$342.90 Published ratingsThe Echo with a physical manual override button included, so sway response does not depend on unlocking a phone.
Best for: Anybody buying an Echo who intends to tow a trailer big enough to sway.
Check price on AmazonWho should not buy this tier: Skip this tier if you tow a single light trailer occasionally. Four-axle profiles, a hidden dash module and a plug-in Bluetooth unit solve specific install and multi-vehicle problems that a one-truck, one-trailer owner does not have, and the Primus IQ covers that job for less.
Which controller fits which install?
Every figure here is the manufacturer's own published spec from the current listing.
Five of the six controllers here are proportional; only the Venturer Next is time delay, and only the Echo Kit includes a physical manual override button.
Published standard A published, traceable figure: a standards body, a federal regulation or a manufacturer specification states it.
| Controller | Type | Axles supported | Mounting |
|---|---|---|---|
| CURT Venturer Next Electric Trailer Brake Controller, time delay, 1 to 3 axles | Time delay | 1 to 3 | Under-dash bracket |
| Tekonsha Primus IQ Proportional Brake Controller, 1 to 3 axles | Proportional | 1 to 3 | Snap-in dash clip |
| CURT Echo Mobile Bluetooth Trailer Brake Controller, 7-way, 1 to 2 axles | Proportional | 1 to 2 | Plug in, no wiring |
| Tekonsha Prodigy iD Brake Controller, 1 to 4 axles | Proportional | 1 to 4 | In-dash, phone configured |
| REDARC Tow-Pro Liberty Electric Trailer Brake Controller, 1 to 2 axles | Proportional | 1 to 2 | Remote head, hidden module |
| CURT Echo Kit, Bluetooth Brake Controller with Manual Override Button | Proportional | 1 to 2 | Plug in, physical override button |
Axle support governs how many trailer axles a controller can drive brakes on, not how many axles it is legally required for. Check your own trailer's brake count regardless of rating.
Is a brake controller legally required?
Trailer brakes themselves are required above a threshold that varies by state, commonly somewhere between 1,500 and 5,000 lb, and there is no single federal number that covers every state. If your trailer has electric brakes at all, a functioning controller is effectively mandatory, because electric trailer brakes do nothing without one. Check your own state DMV or DOT site and the weight rating on your trailer's certification label rather than trusting a single number here.
How do you set the gain once it is installed?
Gain is the strength of the signal sent to the trailer brakes for a given amount of tow vehicle braking, and it has to be tuned to your specific trailer, not left at a factory default. Start low, on a straight empty road at low speed, and increase it until a moderate stop applies noticeable trailer braking without a jerk. Full instructions are in our brake controller gain guide, and the brake gain calculator gives you a starting point for your own trailer and tow vehicle weights before you fine tune it on the road.
How we chose
We did not test this hardware in person and we never claim to. Picks are researched from manufacturer specification sheets, published towing standards, and the recurring themes in verified owner reviews. Every pick is matched to a real gross trailer weight rating, a real tongue or pin weight rating, a real receiver size or a real load index rather than to a price bracket, and it is placed in the tier where its published capability actually belongs. We rejected the unbranded flood that dominates the search results in several of these categories, because a weight distribution hitch, a brake controller, a trailer tire and a set of safety chains are all parts whose failure puts a loose trailer on a public road. Where a figure is towing convention rather than a published standard we label it that way, and where a manufacturer does not publish a figure we leave it out instead of estimating it.
Frequently asked questions
What is the difference between proportional and time delay brake controllers?
A proportional controller uses an accelerometer to match trailer braking to how hard the tow vehicle is actually decelerating, in real time. A time delay controller ramps to a fixed preset over a set time on every brake application, regardless of how hard you are actually stopping. Proportional is the better technology at every price point where both exist.
Do I need a brake controller if my trailer has surge brakes?
No. Surge brakes are hydraulic and self-actuating from the trailer coupler's own momentum against the tow vehicle, and they do not connect to an electric brake controller at all. Controllers on this page are for electric and electric-over-hydraulic trailer brakes specifically, which need a signal from the tow vehicle to work.
How do I set the gain on a new brake controller?
Start low on a straight, empty road at low speed, and increase the gain gradually until a moderate brake application produces noticeable trailer braking without a jerk or the trailer wheels locking. Retest after any real change in load. Full step by step instructions are in our brake controller gain guide.
Can I use one brake controller with more than one trailer?
Yes, provided the controller supports the axle count of each trailer and you retune the gain for each one, since gain depends on the loaded weight of the specific trailer behind you. A plug-in controller like the CURT Echo also moves between different tow vehicles in seconds with no wiring change.
Is a wireless brake controller as reliable as a wired one?
A well reviewed Bluetooth unit like the CURT Echo is reliable in normal use, and it continues braking at its last programmed setting if the Bluetooth connection drops, rather than stopping the trailer brakes outright. The real tradeoff is manual override access, which is why the Echo Kit adds a physical override button rather than relying on the phone app alone.
What happens if I tow a braked trailer with no controller installed?
The trailer's electric brakes simply do nothing, because they need a signal from a controller to activate at all. All of the stopping falls on the tow vehicle brakes, which were not sized for the combined weight, and the trailer's breakaway system becomes the only brake it has if it ever separates.
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Researched, not professional advice. This page is compiled from published standards, manufacturer towing guides and product specifications, and owner-review consensus, not hands-on testing. Figures described as a rule of thumb are towing convention rather than published standards, and they are labelled that way wherever they appear. Nothing here overrides your own ratings. Work your payload sum before your tow rating, because payload is the limit that actually binds on most half ton trucks and nearly every SUV. Load a conventional trailer to 10 to 15 percent tongue weight and a fifth wheel to 15 to 25 percent pin weight, and never lighter: a tail heavy trailer is what starts sway. Weigh the rig loaded rather than trusting a brochure dry weight. A weight distribution hitch and a set of air bags both restore ride height and control, and neither one raises a single rating. Trailer brakes are required by state law above a threshold that varies by state, and a breakaway battery that has quietly gone flat is the normal condition of most trailers on the road.