Morning All, I've finally gotten a bit of free time and have started to work on the brakes for my '51 450. I've gotten the master cylinder unbolted but I can't get the pin out of the yoke to finish the removal. I've been soaking it in penetrating oil but as of sunday it's still stuck. Y'all have any tips or tricks?
Next question is around the master cylinder itself. I've done numerous searches and have come up dry in regard to a new ones. It's an original Delco 5451742 11/2" dia. I've got a pretty good Country/Farmers Napa close by, once I get it off as well as the hydrovac I'll take them in. My question is, do any of y'all know of a vender/website/good ol boy that would have these by chance?
You might consider sending it to one of the brake restoration shops, yoke and all. White Post Restoration in Virginia is the one that comes to mind, they can sleave it if needed.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
Saw Mill, Since you have the master cylinder out, try applying some heat (a general purpose propane or Mapp gas torch will do) to warm up the clevis/pin a little, then hit it with some of that penetrating oil. The heat will encourage the penetrating oil to get down into the space where it's bound up and hopefully free it up. May take a few go-rounds, but that's worked for me in the past when freeing up such things. Don't forget to protect the rest of the cylinder from direct heat.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
Last resort- - - -carefully drill the pin out. It's a simple common hardware item that can be replaced, so don't waste a lot of time struggling with it. Start with a small drill bit, maybe 1/8", and drill the hole out in steps until it's close to the full diameter. Then use penetrating oil and/or heat to remove the remaining shell. Use a drill press if possible, instead of a hand drill motor. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
Those master cylinders are very hard to find, and they would be NOS. The take-offs almost always have just enough pitting/corrosion that they will have to be re=sleeved. Soft parts are available, but don't take a chance on putting them in an imperfect bore - and don't hone them so much that the soft parts lose their proper fit. The brakes on these trucks are challenging, but if you get them right, they will last a very long time.
Did you ever find a replacement.? I’m looking for a Master cylinder for a 50 GMC 453 Firetruck. Cant get the rebuild kits for them, so having it reserved is not an option. Later Auto parts is looking for me now, says they have 20 that match crossreference numbers. He said it’s 1-1/2 inch piston. Waiting on him to call back and text me a picture of what they have. Hopefully will work. My old one is a Wagner FD4428.
