Quote Originally Posted by RogerH View Post
That may be the case for a post December 1977 car but the T&C rules are different for pre 31 December 1977 cars.

For these pre cars, brakes are "free" subject to disc and drum friction surfaces being ferrous. "Free" means that the original part may be replaced with a newer part as long as the new part provides no additional function relative to the original part and must be from the same era and was available or used on that make and model in period. "Era" means the period when a particular vehicle model and its components were actively used in motor sport competition.

This could be interpreted to mean that an original 4 pot calliper could be changed to a Wilwood 4 pot of similar dimensions if it could be proved that the Wilwood (or the form of calliper on which the Wilwood was based?) was available to be used in the period (era) related to the subject car.
Further to my post, there is an interesting possible interpretation of what "era" means. This is a relatively important definition as it defines during what time period you can select parts that were available (not necessarily fitted to a subject car or model). You could then fit these parts and on the face of it, have a compliant T&C car.

Under the T&C definition "Era" means the period when a particular vehicle model and its components were actively used in motor sport competition. I understand in an initial draft of the rules, era was limited to the model production life of a specific car - for example the"era"of a Mk1 Escort would have been January 1968 to November 1974.

Under the present definition (using the Mk1 Escort example), we would need to determine when the Mk1 Escort was actively used in motor sport competition. What does this actually mean? It seems to be a very subjective assessment as some could no doubt argue that the Mk1 Escort has been continuously actively used in motor sport competition and therefore any component available up to 2014 could be fitted to a compliant T&C car?