Would of been nice if TYM had a better resolution on pages 211 & 212. But both show the brake switch going to another 3-wire box, 1-in & 2-out, one to the dash & one to the rear lights.
The TYM World site has the manuals for their recent tractors. For older tractors they don’t list, such as my T233, one of the dealers, (Smith’s Engerprises), archived all of the manuals on the old TYM site, and you can down load them from their archive. Just Google search “TYM t233 service manual pdf”. And the Smith’s Enterprise archive will turn up.