BUSY BOLTERS Are you one?  The Shop Area
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Jul 21st, 2025 | | | | Joined: Jan 2015 Posts: 25 'Bolter | | 'Bolter Joined: Jan 2015 Posts: 25 | I posted about this in my introduction, and was advised that maybe I should put it here. Working on a 48 Chevy 6400, and have a rear brake hanging up. I am thinking wheel cylinder. My problem is, I cant seem to find cylinders for anything over a one ton. Will that one work? This is my first foray into larger trucks, and I really enjoy driving/using it. Stopping, however, would be a bonus. Could someone maybe point me in the proper direction, maybe shoot me a part number, or a source? Something along those lines. Thanks | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | I'll look in the catalogs tomorrow for it. One ton will not fit. You can probably get a wheel cyl. kit & rebuild it. It probably has 2 wheel cyls. on each side in the rear.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Nov 2005 Posts: 6,061 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,061 | Hy boonie, welcome, the rear wheel cylinders for your truck are still available, Raybestos part number WC3677 $81.97 at RockAuto, Napa part number UP3677 $102.60, hope that helps. | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | All I could come up with are kits. Napa #37. CARQUEST #C550.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Jan 2015 Posts: 25 'Bolter | | 'Bolter Joined: Jan 2015 Posts: 25 | Thanks for all your help, and the numbers. Ended up ordering two kits from rock auto. Now I just need to figure a time to do it, and hope I get it right. | | | | | Joined: Jan 2010 Posts: 120 Shop Shark | | Shop Shark Joined: Jan 2010 Posts: 120 | I recently fixed a problem. The rotating cup on the cylinder has teeth all around it that get turned by the adjuster wheel on the backing plate. I had welded the backing plate adjuster wheel to the backing plate adjuster shaft on the drum side, as these are just peened and it was loose. The rotating cup on the cylinder was not perfectly round and the hydraulic movement of the cylinder was forcing the cup into the weld of the adjuster and jamming.
Check yours for clearance.
'47 Canadian RHD 1.5 ton truck
| | | | | Joined: Nov 2010 Posts: 430 'Bolter | | 'Bolter Joined: Nov 2010 Posts: 430 | Boone, I was able to pull mine off, measure the diameter and have my auto parts store deliver a universal kit that had the cups in it. I clean everything well and assembled using some brake fluid. That was a few years ago and all is good. I did have some pitting in the bore, but thankfully nothing is leaking.
When you are ready, I am making front disc brake kits that should fit your truck. I am shipping out the first five kits this week and I plan to stock the brake kits for immediate shipping.
Welcome to the board.
| | | | | Joined: Jan 2015 Posts: 25 'Bolter | | 'Bolter Joined: Jan 2015 Posts: 25 | Finally got the time to work on this today. What a pain in the #^$. After I finally got the drum off, I discovered the problem. Broken spring. Easy fix. If someone in town would have had a spring in stock. Looks like Monday. Rebuilt the cylinder while it was apart. Seemed like a good idea. | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | If new cylinders are available, it is usually time, labor, frustration, savings to replace, especially if in a moist climate, and the vehicle has been sitting for a while, brake fluid is hygroscopic-attracts water, thus the rust and pits.
'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.
| | | | | Joined: Jan 2015 Posts: 25 'Bolter | | 'Bolter Joined: Jan 2015 Posts: 25 | yea. amazingly there were no pits or even any rough spots in the cylinder bore. I expected to have to hone it a bit. ill pick up some new springs on Monday, and get it all put back together. then in six months I can fix the other side. lol | | |
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