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Garage / Re: Brake Master Question
« Last post by jbcollier on Saturday,April 27, 2024, 06:23:56 AM »I have fitted a lot of master cylinders and worked on a lot of older cars. Single circuit masters last much longer than duals and give far less grief. Single circuits are also simple to install and bleed. Fit a cap with a level sensor and you have all the warning you need if there is an issue.
I have seen both leak due to corrosion at the exposed end but only dual circuit masters have internal issues and bypass. One famous example was when VW upgraded from single to dual. Again no notable problems with the single but the dual was famous for going from good to ON-THE-FLOOR in an instant. Yup, would bypass BOTH circuits!! If you have a dual system, by all means keep it that way. Just remember to change the master every 40K or so as preventative maintenance. If you have a single circuit, just fit a sensor cap and thank your lucky stars.
I have seen both leak due to corrosion at the exposed end but only dual circuit masters have internal issues and bypass. One famous example was when VW upgraded from single to dual. Again no notable problems with the single but the dual was famous for going from good to ON-THE-FLOOR in an instant. Yup, would bypass BOTH circuits!! If you have a dual system, by all means keep it that way. Just remember to change the master every 40K or so as preventative maintenance. If you have a single circuit, just fit a sensor cap and thank your lucky stars.