Locomo's carries the Rollz Rhythm Parkinson's Walker and the Saljol Carbon, which has an inbuilt slow down brake. Both are know to be helpful for those whose mobility is challenged due to a neurological condition. 

Locomo also carries the Rollz Motion Slow Down Brakes accessory, which can be added to the Rollz Motion series (expect the Performance), or the Saljol Slow Down Brakes that can be added to the Saljol Aluminium walker.