Mine is like that too. When I first had the boat I looked at it very closely and decided that it was nowhere near man enough for its task, particularly if the river ebb was running from stern to bow. Short of completely rebuilding it on a considerably larger scale it never would do the job properly and I was not prepared to do this on a new boat - in 1996.
I elected to live with Edson's shortcoming. So I clove hitched an 18" length of 1/4" diameter line to the top of the stainless hoop directly in front of the wheel and then, every time I leave the boat, I clove hitch the other end to the top of the wheel.
I only use the brake for lightweight tasks just to momentarily hold? (huh) the wheel whilst I briefly do something else in the cockpit. Anything more I just click in the autopilot.