Richard71 Posted September 29, 2020 Report Share Posted September 29, 2020 Would anyone know what the bore diameter is of the brake servos fitted to our cars. I ask because I'm querying an issue with Wilwood calipers and they require this information. Richard. Quote Link to post Share on other sites
reginald Posted September 29, 2020 Report Share Posted September 29, 2020 Hi Just checked a an orginal 1975 brake master cylinder. Not sure of the servo inner dia. Approx 6' 225" Master cylinder First bore is .860" 55/64" then steps down to .847" 13/16" Regards Richard Quote Link to post Share on other sites
JochemsTR Posted September 30, 2020 Report Share Posted September 30, 2020 10 hours ago, reginald said: Master cylinder First bore is .860" 55/64" then steps down to .847" 13/16" are you sure? I recall 0.812" and 0.774" Quote Link to post Share on other sites
reginald Posted September 30, 2020 Report Share Posted September 30, 2020 Hi Double checked First size bore .860" piston is .847" dia Second step down bore is .812" piston is .807" dia This is from an original 1975 master cylinder other years may be different ?? Regards Richard Quote Link to post Share on other sites
JochemsTR Posted October 1, 2020 Report Share Posted October 1, 2020 7 hours ago, reginald said: This is from an original 1975 master cylinder other years may be different ?? Thank you Richard. I updated my documentation. yes, my information comes from a 1970 mc. Jochem Quote Link to post Share on other sites
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