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Jul 21st, 2025 | | | | Joined: Nov 2013 Posts: 105 'Bolter | | 'Bolter Joined: Nov 2013 Posts: 105 | I just finished bleeding my 49 half ton's brakes and when I went to put the fill plug back into the master cylinder, I noticed that a thin "gasket"(?) was dangling from the plug. I am guessing a gasket or some sort of seal is needed to keep the system air tight, but where can these be found? After looking at the usual Chevy truck online part sites I found MC rebuild kits that include a fill plug/cap and an o-ring that looks like it might go into the fill plug/cap, but I have not found just the gasket or o-ring.
Is a seal necessary, or will keeping the plug tight be enough of a seal? | | | | | Joined: Sep 2013 Posts: 1,288 'Bolter | | 'Bolter Joined: Sep 2013 Posts: 1,288 | Weeellllllll, it might be OK without a gasket. The cork casket on my 51 is broke in one place and I've been babying it for a couple of years. When it totally fails I plan to make a replacement from cardboard (as from a shoe box or such, not brown cardboard). A ball peen hammer and a couple appropriate sized sockets are all that's required.
1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1964 CJ5
| | | | | Joined: Nov 2001 Posts: 1,516 'Bolter | | 'Bolter Joined: Nov 2001 Posts: 1,516 | A GOOD auto parts store will have a Dorman section. Orange and Black steel cabinets with every fitting,washer,brass or steel plug,ferrule,etc....etc.... under the sun.
Back 45 years ago, i didnt even know what a "wave washer" was til i started looking thru the Dorman display. I spent probably an hour there that day.
So.....find a Dorman display and youll find your 1 1/4" copper washer.
The worst part is getting the rummy behind the counter to figure out how to price it.
Good Luck, | | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | You're going to find that the plug isn't sealed to start with- - - -there's a tiny air bleed hole drilled into it. The gasket is just a dust seal, and a piece of thin cardboard trimmed to fit will work well. If the bleed hole gets plugged up and a vacuum develops in the reservoir, air can be drawn past the wheel cylinder cups as the brake pedal is released after a stop.
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!
| | | | | Joined: Nov 2013 Posts: 105 'Bolter | | 'Bolter Joined: Nov 2013 Posts: 105 | Sounds good. I'll either find the Dorman rack and browse for a gasket, or do the cardboard cutout thing. Thanks! | | | | | Joined: Jan 2010 Posts: 378 Shop Shark | | Shop Shark Joined: Jan 2010 Posts: 378 | Hey Jerry, I hate to but in but you recon that might be what's going on with my brakes? I'll bleed them, let the truck set a day or two, no brakes. There are no leaks that I can find. Bleeding the old fashioned way. Don't know. Maybe that little hole is stopped up! Thanks folks for letting me but in for a second
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