'41 Fat Bottom Girl Posted May 4, 2019 Report Share Posted May 4, 2019 I rebuilt the old wheel cylinders about 20 years ago and now in process of replacing lines, cylinders and all in order to do a complete upgrade. Pulling the old wheel cylinders, I noticed the ends of the cylinder bores past the piston ends had some rust- not a lot, but enough to show on some surfaces. When I rebuilt the cylinders, new shoes etc. at that time, I wetted the bores and piston seals lightly with brake fluid (I use Dot 3) during reassembly. All was good. Then the car sat for a couple long periods (over a ten year period, with less than 200 driving miles) before I was able to drive it more frequently this past year. I suspect during those times, condensation had formed inside and caused the light rusting, which in turn caused a wheel cylinder leak as I got a bit more wear on the previously new shoes. Obviously, the light coating of brake fluid alone wasn't enough to stop rust past the initial piston travel. So, I am thinking about wiping a slight film of rubber/ elastomer compatible grease on the wheel cylinder bores outside of the piston travel areas behind the end boots to help prevent any rusting in the future. Of course, I need to be sure there won't be any incompatibility with my DOT3 brake fluid, too. Suggestions? Quote Link to comment Share on other sites More sharing options...
James_Douglas Posted May 5, 2019 Report Share Posted May 5, 2019 Use: CASTROL RED RUBBER GREASE You can get it on amazon. Smear it on the entire cylinder bore, the plunger, the rubber, the ends of the pins. Great Stuff. Quote Link to comment Share on other sites More sharing options...
'41 Fat Bottom Girl Posted May 5, 2019 Author Report Share Posted May 5, 2019 Thanx very much. This will be my SOP from here out. Quote Link to comment Share on other sites More sharing options...
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