working on the 65 C60 grain truck rear brakes now. looks ( i believe) like i have the twinplex brake system on the rear for a 19500GVW trucks. found the wheel cylinders on Parts geek.com, the hardware kit on rock auto( i think). The drums on one side are completely saturated with gear lube as the axle seal was leaking bad and just coated everything. I have tried it all to find the shoes. anyone have an help they are the 15x4" brake shoes. Having a hard time... Thank you all for the help! kind of just planning on replacing everything inside since I'm in this deep.
Last edited by Peggy M; 02/14/202411:42 PM. Reason: added more info to the title
Those brake shoes are unobtanium. No one manufactures them anymore and they cannot be purchased anywhere. You will have to send off your current shoes to be relined, its the only option for the 15x4 size. Ill dig and try and find the specific parts number for you, but it wont be of much help.
Occasionally a NOS set pops up from an old farm shop that's being cleaned out, but it is extremely rare to ever happen.
The shoe backing can easily be reused with new linings riveted on. Just about any large truck shop should be able to do that, but I know there are a number of places you can ship them off to that can quickly do this as well depending on your situation. Same thing with the brake band on your transmission. I have also not successfully sourced the return springs for the rear either, so be gentle to them.
I typically strip every brake part I can from any of these trucks I find in the junkyards. Its not often, but its the best way to get drums, shoes, springs, adjusters, etc to have spares on hand and to help out others. May be worth calling around, but fair warning 8 times out of 10, the front desk has no idea they have 50/60/80 series trucks in the yard.
HF Farms, i found a local company that does the relining! definitely going that route. Great idea about stripping trucks locally at scrap yards! Good idea about the trans/ driveline brake as well!
I have a pair of those drums that I bought new in the '90s and only put a couple thousand miles on 'em before I wound up scrapping the whole T150 rear axle housing in favor of the newer T170. Glad I saved those drums, and I sure wish I'd saved the whole axle with all its new brake hardware, shoes, seals, and I even replaced all the wheel bearings. That setup would be worth a few bucks today.
Well back brakes are slowly coming along! Here are some progress pictures. Parts geek upper wheel cylinder is not correct but i think i found the correct one elsewhere. The Cylinder on the partgeek.com one has the bleeder on the upper cylinder on the bottom. So air will just be trapped. Napa should be able to help since i have casting numbers now! backing plate all cleaned and painted! man it takes along time for parts to come in! other side coming soon! cant wait to finish this up!
AKrause, To help benefit other "1965ish" Big Bolt owners, could you post the casting numbers from the existing cylinders and what NAPA provides for replacements. That will just add to our ever-growing information in support of these trucks! Glad you are able to continue the excellent progress!
Last edited by Peggy M; 02/24/20243:24 PM.
~ 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)
Gdads- great idea! its an odd one because both of the cylinders have the exact same casting number but they are clearly different. My Napa was not much help BUT- the brand Centric part#- 134.80004 is the upper replacement and is correct( also sold by parts geek but not in stock on their website but sold by them on ebay...odd). A little hard to find but an eBay search got my two of them. And for the lower i went to Partsgeek.com the lower rearward one from Dynamic Friction Company Part#- 141274-06211992. It is correct as well. Parts geeks upper is not correct from Dynamic Friction Company. the bleed port ends up on the bottom so obviously it will trap air in the top and you'll never be able to fully bleed the system. Mind everyone this is for the 15"x4" brakes
Also brake shoes got relined - Costed me $300 in cash to a local company. Unfortunately these 15" drums are an odd size and they don't get the linings all that often so it was a little more than usual the guys said. But they look great and should be much better than the oil soaked old ones!
Thanks for an outstanding info report. Glad you were able to source them and can only offer my own "cringe" at the relining costs - Ouch! But, safe and functional brakes are essential equipment!
Looking forward to your next parts hunt!
~ 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)
Regarding the bleed ports, I thought the threads in both holes were the same so you could just switch bleeders and lines as needed. that would explain the casting numbers being the same.
Edit: Oops, crap. On my '67, the transfer lines are visible outside the backing plate versus having them inside. So, my lines/fittings all have the same holes, but clearly the older ones do not because the transfer lines are inside the brake backing plate. So that's what I was recalling, and I just now did so.