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Jul 21st, 2025 | | | | Joined: Jul 2015 Posts: 135 'Bolter | | 'Bolter Joined: Jul 2015 Posts: 135 | I am going to be upgrading my 1950 3100 brakes to a dual circuit master cylinder setup. I have ordered this master cylinder. I cannot find the push rod or the linkage that attaches to the brake pedal (I put them somewhere safe I guess). Can I make a push rod out of a bolt (Grade 8)? I will fabricate the master cylinder bracket myself will be something like this bracket but will probably add gussets at top and bottom if there is room. BTW not going with a power booster strictly hydraulic. Jackie | | | | | Joined: Feb 2000 Posts: 4,886 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 4,886 | You will need a clevis to hold the push pin to the brake pedal, and then be able to adjust the rod length at the clevis. Just go to the junkyard and see what you can find, most older trucks and cars used about the same sizes parts. You can alter what you find to fit your application. At the bottom of this page, http://www.ecihotrodbrakes.com/chevy_master_assemblies.html is a picture of a master cylinder and a push rod, the rod assembly is what I would think you need. If a straight rod is all you need, then a bolt would work if the ends are rounded over and smooth. Just remember, it has to be held captive with zero ways of falling out. Joe
Last edited by Joe H; 05/31/2016 2:42 PM.
| | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | It also has to have some free play when the pedal returns to static, .125" or so, so that the master can refil.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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