While virtually all manufacturers suggest a full brake fluid bleed/replacement every 1-3 years (primarily to remove accumulated moisture), my experience with older machines without disc brakes really should have their fluid changed every two years maximum. I do a comprehensive bleed (about a pint through the system) on all my machines at least every two years, and find I don't have issues, assuming I'm starting with a fresh rebuild. My oldest drum brake job (Singer roadster) is going on 14 years without hydraulic issues.
Last edited by Bitsobrits; 05/10/19 05:34 PM.
