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Mod | | | Forums66 Topics128,080 Posts1,055,954 Members48,430 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Sep 2006 Posts: 1,997 Big Bolt Forum Co-moderator | | Big Bolt Forum Co-moderator Joined: Sep 2006 Posts: 1,997 | Are the master cylinders for the big trucks the same as the smaller trucks, except for the hydro-vac?
A day without laughter is a day wasted- Charlie Chaplin
When wrestling a grizzly bear, you have to keep at it until the bear gets tired, not when you get tired. 1948 Chevy 2-Ton | | | | | Joined: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | NO, they are not the same...the bore is larger on the bigger trucks. Mike B  | | | | | Joined: Feb 2010 Posts: 476 'Bolter | | 'Bolter Joined: Feb 2010 Posts: 476 | You can check out the master cyls. in the Chevy's of the 40's catalog. I just got a catalog free in the mail and the master cyls. are fairly reasonable, I thought. | | | | | Joined: Feb 2004 Posts: 29,780 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,780 | The big bolt MC has to be "fail safe"- - - - able to move enough volume of fluid to apply all the brakes, with or without the Hydrovac working. That requires a bigger bore and a longer stroke than the pickup cylinders.
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: Jan 2016 Posts: 264 'Bolter | | 'Bolter Joined: Jan 2016 Posts: 264 | I ended up have mine drilled and sleeved with stainless, probably outlast me. Very reasonable at a local shop, | | | | | Joined: Mar 2007 Posts: 173 'Bolter | | 'Bolter Joined: Mar 2007 Posts: 173 | These might be useful - for my 55 second series.
MASTER CYLINDER REBUILD KIT - UP33 - NAPA
MASTER CYLINDER - M21698 - AMAZON | | | | | Joined: Dec 2018 Posts: 2,450 'Bolter | | 'Bolter Joined: Dec 2018 Posts: 2,450 | 52vff Don't try this at home ,I was wiring at a commercial oil field powder coat shop had the worst pitted wheel cylinder I had blasted and powder coated inside. Then Sunnen precision honed it back to size,it is still running on one of my storage rigs I use to keep brakes and driveline stuff alive. Now I don't know if domestic powder coat would work. There coating is used to protect oil field fittings from vicious downhole fluids in injection wells. .02 cents | | | | | Joined: Jan 2016 Posts: 264 'Bolter | | 'Bolter Joined: Jan 2016 Posts: 264 | Precision machine is sent out by me. I can do a lot but high precision or safety equipment is best left to pros in my book. Unless they come to me and we work together. .. | | |
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