The phrase "individual wheels" refers to separate or independent wheels that can move or operate on their own, without relying on other wheels. Full definition
When a vehicle isn't responding to the driver's commands, such as during a skid, the system takes over, braking individual wheels to put the vehicle back on course. (articles.orlandosentinel.com)
The anti-lock system already monitors the individual speed of all wheels and reduces braking power of individual wheels when it detects it locking. (mechanics.stackexchange.com)
The system automatically applies brakes at individual wheels to keep you firmly on the ground. (porscheorlandpark.com)