Change your brush roller when the bristles are worn short, splayed or loose, when the roller won't spin freely even after you've cleaned it, or when it wobbles or grinds as it turns. A lot of the time a roller only needs the hair and string cut off and its bearings cleaned or oiled. Once the bristles themselves are worn down, cleaning won't bring them back, and it's time for a new one. If you vacuum every day, expect to replace it sooner.
Updated October 2026. This answer first ran in our FAQ. We've added the signs to look for, a monthly check and the rollers we make.
The brush roller, also called the beater bar or brushroll, is the spinning brush that loosens dirt from your carpet so the suction can lift it. On most vacuums it sits on the underside of the floor head, and some attachment tools have a small one of their own. Depending on your vacuum, it also handles hard floors.
Signs your brush roller is worn out
- The bristles look shorter than they used to, flattened, splayed out, or loose in their rows.
- The vacuum leaves dirt behind on carpet even with an empty bag or bin and a clean filter.
- The roller doesn't spin, or spins slowly, after you've cleared the hair off it.
- It wobbles, rattles or makes a grinding noise, which usually points to worn bearings or end caps.
- The roller body or its end caps are cracked or warped.
How to check it once a month
A quick check every month keeps the roller working longer. Unplug the vacuum, turn it over and take off the bottom plate or roller cover. Most come off with clips or a few screws. Cut any wrapped hair and string with scissors along the length of the roller and pull it free. Then clear the ends, where hair packs in around the bearings and stops the roller from turning.
Spin the roller by hand. It should turn freely and quietly. If it feels gritty, clean the bearings, and if your manual says they take oil, add a drop. While the roller is out, run your hand along the bristles. If they feel short and soft compared with how they started, replace the roller.
Check the belt while you're in there. A stretched or cracked belt causes the same symptoms as a worn roller, and our post on how to tell when a vacuum belt needs changing covers it.
How often to replace a brush roller
There's no single schedule. It depends on how often you vacuum and what you vacuum over. A vacuum that runs every day across thick carpet or a lot of pet hair wears its roller out much faster than one used once a week on hard floors. The monthly check is the easiest way to catch it before your floors show it.
Brush rollers we make
- Soft brushroll for the Shark DuoClean PowerDetect cordless stick IP1251 and IP3251, replacing Shark part 550CH1000. More in Shark parts.
- Roller and two right-side end caps for the Dyson DC25, replacing Dyson parts 917391-01 and 914123-01. More in Dyson parts.
Both are aftermarket parts made by Think Crucial and designed and engineered in the USA. U.S. shipping is free, and orders placed by 2pm ET ship the same business day. Don't see your vacuum? Email support@thinkcrucial.com with the model number, and we'll reply within one business day.
Frequently asked questions
Can I clean a brush roller instead of replacing it?
Often, yes. Cutting off wrapped hair and cleaning or oiling the bearings fixes most rollers that have stopped spinning well. Cleaning can't fix bristles that are worn down, though, and that's when you replace it.
Is a beater bar the same as a brush roller?
Yes. Beater bar, brush roller, brushroll and roller brush all mean the spinning brush in the floor head.
Should I replace the belt at the same time?
If your vacuum has a belt and it's stretched, glazed or cracked, yes. It's already off when you swap the roller, so it's the easy moment to do it.