How to Break In a Brushed RC Car Motor (Dry, Water, Traxxas)
Breaking in a brushed motor seats the carbon brushes to the curve of the commutator, so they touch fully, spark less and give more power and runtime. The simplest method is the one Traxxas gives for the Titan 12T 550: drive the first battery pack smoothly on pavement with the stock pinion, no full-throttle starts, no braking or reverse. A bench break-in at low voltage does the same more precisely. Water break-in is popular but disputed. Brushless motors need no break-in at all.
By Kyle HilsonUpdated: October 20264 min read
Why break in a brushed motor?
Inside a brushed motor, two carbon brushes press on the spinning commutator. New brushes are flat-faced, so at first only part of their surface touches the round commutator. That causes arcing, heat and lost power. Running the motor gently for a while wears the brush faces into the commutator’s curve. A well-seated motor runs cooler, pulls less current for the same speed and its brushes last longer.
| Motor | Break-in needed? |
|---|---|
| Stock brushed 540/550 (Traxxas Titan, Arrma, ECX, Tamiya) | Short break-in helps |
| Rebuildable modified brushed motors | Yes, after every brush change |
| Crawler brushed motors (e.g. 35T–55T) | Short break-in helps smooth low-speed control |
| Brushless motors | No: there are no brushes |
Method 1: drive it in (Traxxas method)
Traxxas says the Titan 12T 550 needs a brief break-in. For the first battery pack:
- Keep the stock pinion installed.
- Drive on a flat, paved surface.
- Accelerate smoothly; no full-throttle starts.
- Do most of the driving at higher, steady speeds.
- Don’t use the brake or reverse during this pack.
This is the method most owners of Rustlers, Stampedes, Slashes and Bandits with Titan motors use. It needs no tools.
Method 2: bench break-in at low voltage
- Remove the motor or the pinion so the motor spins without load.
- Connect it to a low voltage: about 3–4 V (a single 1S LiPo, a variable bench supply or 3 NiMH cells). Mind polarity.
- Let it run until the battery is nearly empty or for about 15–30 minutes on a supply, checking temperature; it should stay warm, not hot.
- Reconnect and drive normally.
Some racers use a dedicated motor break-in tool or a variable supply for consistent results. Low voltage seats the brushes slowly with little arcing, which is gentler than a hard first pack.
Does water break-in work?
Water break-in means running a brushed motor submerged in a cup of water at low voltage for a minute or so. Supporters say the water cools the motor, flushes out carbon dust and reduces arcing. Critics say it brings rust to the bearings, can damage the magnets and comm, and gives no measurable advantage for a stock motor. Since stock motors are seated by the drive-in or bench method, there’s no reason to risk it.
If you do try it: use distilled water and low voltage only, never with a brushless motor, then dry the motor thoroughly with compressed air and oil the bushings or bearings straight away.
After break-in: keep it running well
- Gear for the terrain; a pinion that is too big overheats brushed motors fast.
- Check temperature after runs: if you can’t hold your finger on the can for a few seconds, gear down.
- Clean the motor with motor spray after dusty or wet runs and oil bushings or bearings lightly.
- Replace worn brushes, and break in again after replacement.
- Cutting out or losing power suddenly can be a sign of worn brushes: see why an RC car cuts out.
Brushed or brushless?
A brushed motor is cheap, simple and controllable at low speed, which is why it’s still common in crawlers and entry RTRs. Brushless motors need no break-in or brush maintenance, are more efficient and much faster, but need a matching brushless ESC. Moving from brushed to brushless is the most common upgrade on bashers.
FAQ
What is the best way to break in a brushed RC motor?
For stock motors, drive the first pack smoothly on pavement without hard starts, brakes or reverse. For rebuildable motors, a bench break-in at 3–4 V without load is more controlled.
Is dry break-in better than water break-in?
Dry break-in avoids the rust and bearing risks of water, and seats stock brushes just as well.
How do I break in a Rustler’s brushed motor?
The Rustler’s Titan 12T: first pack on pavement with the stock pinion, smooth acceleration, no braking or reverse.
Do brushless motors need break-in?
No. They have no brushes to seat.
More on this topic: the complete RC Cars guide covers the basics behind this article.
About 20 years in RC. Mostly boats in the NAVIGA Mini Eco Expert class, with many self-made parts; also a King Motor Baja 5B, a home-built electric plane, home-built nitro planes he has flown, and an RC helicopter. More about SwellRC
