1965 - 1966 Corvette: Service Bulletin: High Parking Brake Application Effort
Subject: High Parking Brake Application Effort
Model and Year: 1965 - 1966 Corvette
Source: Chevrolet Technical Service Bulletin
Bulletin No: TSB #66-59
Date: May 4, 1966
TO: ALL CHEVROLET DEALERS
High parking brake application effort may be experienced on 1965-66 Corvettes due to the low mechanical advantage obtained from the relay lever.
To reduce application effort, a revised parking brake relay lever, with a higher mechanical advantage, was effective in production 4-1-66, Corvette Serial No. 6S118091. This relays lever, Part No. 3899399, is also used for service on 1965 and early 1966 Corvettes.
When installing the revised lever on 1965 and early 1966 models, reworking of the frame attaching bracket is necessary to provide rod clearance when the brake is fully released. The attaching bracket rework is shown in the attached sketch.