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Tagged: Brake Master Cylinder
- This topic has 2 replies, 3 voices, and was last updated 1 year, 8 months ago by
Charles Rooks.
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2023-04-09 at 5:37 pm #6343
Has anyone ever found a modern replacement for the master cylinders? I’ve resealed my originals with the auto parts kits and I use Dot 5 fluid, but they leak pretty much as soon as I finish installing the new seals.
Thanks,
Bill Gorin
OY-1 BuNo 03918 N66535
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2023-04-09 at 6:24 pm #6344
That’s too bad Bill, sorry to hear they’re still leaking. Given your experience I’m sure that you have checked, but it sort of sounds like the barrels are pitted or worn beyond limits. I also assume that you re-used the original pistons, as required, because those in the Raybestos kit will not work properly.
Anyway, the answer to your question is that, yes, others have replaced their master cylinders with various Cleveland, Grove, and Bodell models (that I know of), and maybe even some reservoir types (which I’m not aware of), but the problem with all of them is there’s no bolt-in solution, so mounting adapters are required. Not a big deal, but you also lose the parking brake, which sort of is, I think.
I’m not in favor of deleting the parking brake because it’s probably not technically legal to disable a system the plane was certified with. I’m certainly not an expert when it comes to brakes or whether the old CAR 4a certification standards the T.C. was approved under makes any difference, but Part 23 certainly requires them.
Sam T. or somebody can probably tell you whether they can be re-sleeved or not, but my hazy memory is saying there may not be enough meat on them for that to work.
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2024-08-14 at 1:17 pm #6582
Jim / Bill-
While at AirVenture 2024, Bill Tromblay mentioned he can chrome the inside of brake master cylinders back to standard size. Prevents future corrosion and pitting. May have mine done later this year.
Charles
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