ok my first question for 48 commodore brakes

jrenda

I have read a bunch of the posts regarding part # interchange to redo all the brakes on the 48.  My question is: How do I know which brakes I have and what bore size I need to get for new wheel cylinders?

for ex I see these (some marked for "stepdowns" and others just for the year?

Wagner/Lockheed Number for rear wheel cylinders for 1948 -54 Stepdowns FD-2447 
Bendix Numbers for wheel cylinders for Stepdowns 1 1/8 inch cylinders 3128 ( left) , 3129 (right) 
Bendix Numbers for wheel cylinders for Stepdowns 1 1/16 inch cylinders 3461( left) ,3462 (right) 

Wheel cylinder Coni-Seal WC13600 40-54 Hudson LR 15/16 in Bendix 33600 Midas 1024 Wagner 59240 Auto Spec 84001 EIS 9150

Wheel cylinder Coni-Seal WC13221 48-54 Hudson RF 1 1/8 in Bendix 33221 Midas 1031 Wagner 18291 Auto Spec 84010 EIS 40025

jrenda

well thanks to the internet - and moreso those who have generously posted manuals online - I found the info.  Looks like 8 cyl needs the 1 1/8 version so i will be ordering those.  Looking like 200$ to rebuild all 4 corners inc liners, cylinders, springs and hoses.  Not too bad at all!

Lee ODell

While you are at it may I suggest replacing master cylinder and brake lines as well.

Ol racer

FYI
If your car sits long periods and your replacing the whole brake system, I would use Silicone Fluid going forward....