Thanks. Good advice on brakes. Car is in Florida and will only see sunny days with open road. Do you know where we can get a good drum upgrade kit?
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On the brake shoes, I've used the ceramic matrix shoes and spring kit from Praise several times over the last 20 years. Am about to order front and back shoes and hd spring kits for the GT-37. basically their brake in a box set up. Wuhh wuuh wuuh Musclecarbrakes dot com, same long time business just changed their name about 6 years ago to match the web domain name.
Am also going w 1/16" larger bore wheel cylinders (already have them nos) and going to go with matched slightly larger diam bore manual master. This is something Praise recommends, but I've always been vary wary of changing to larger diam bore master cylinder, going to try it though as with the slightly larger bore wheel cylinders will be a match. Am having two manual masters rebuilt, and going through and swapping out front backing plates and bleeding brakes doesn't take me that long, so can get a comparison.
Have not bought their cryo'ed brake drums, as a big detailing issue, have desired to run original appearance drums and have several stacks of low mile original drums in great shape. For my other '71, I picked up an NOS pair of front alum drums for a '68-70 GS, and had those cryo'ed locally and have installed Praise's shoes and springs. Cryo'ing the drums, changes the molecular structure of the mating surface and with the matrix ceramic shoes even works better.
On the '64, staying drums, would definitely change to a '67 drum master cylinder. These are dual reservoir, much safer. To install will need to plug the rear fitting in the brass T shaped distribution block, and run a line down from the rear port in the new dual master and correctly splice it into the line going back to the rear brakes. Have the front drums measured and see how much metal is left, the fronts do the majority of the braking, condition will give you an idea of where you sit, if need new front drums, nice thick rears are easy to come up with used.