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Big Bolt Brake Solution!
#1371485 Fri Jul 31 2020 02:58 PM
Joined: Jul 2020
Posts: 80
B
Shop Shark
THIS IS NOT A FOR SALE/ADVERTISEMENT POST. THIS IS FOR RESEARCH PURPOSES ONLY

Hello everyone,

I am curious as to how many people would be interested in a direct Bolt in replacement front disk brake setup for the 1.5/ 2 ton big bolt trucks? I know many have struggled with this issue so i'm keen on coming up with a solution to make everyone's life easier when updating your stopping power, so you all don't have to hunt down old parts modify them, and piece it all together. This will determine whether i create a one off set or put in extra work to have them produced on a larger scale.

I am also looking for someone who is exceptionally knowledgeable with any differences between year/ model/ straight axle as it will help me help all of you!

Thank you guys!

Last edited by BigUglyv1; Fri Jul 31 2020 03:00 PM.

THE BLACK VIKING
1958 Viking 60 ~ my new toy hauler

1954 GMC 350 (2ton)
Nick named "BIG UGLY" due to the rust, faded paint, and IMO the ugly flared "mustache" grille surround.

My Current fleet: 1954 GMC 350, 1956 chevy pickup, 1958 Viking 60, 1969 mach 1, 1970 chevelle, 1970 skylark custom, 1971 nova, 1989 mustang GT, 2020 panigale v4.

Keep 'em rollin fellas!
Re: Big Bolt Brake Solution!
BlackViking60 #1371488 Fri Jul 31 2020 03:24 PM
Joined: Dec 2015
Posts: 2,143
Big Bolt Forum Moderator
in my opinion (others may chime in as well) you need to do both front and rear since on a big bolt, most if your braking happens at the rear axle as opposed to a car or light duty truck where most braking is done at the front axle.

That said, 55 and earlier have the 5/10 lug setup, where in 56, they went to the 6 lug pattern. I may be beneficial if you are making them, to have an option of bolt pattern.


Mike

1955 Chevy 6400 ex-flatbed (no bed now!)
In the Stovebolt Gallery


1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery

1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
In the Stovebolt Gallery

Sufficient unto the day is the evil thereof
Re: Big Bolt Brake Solution!
69Cuda #1371501 Fri Jul 31 2020 04:37 PM
Joined: Jul 2020
Posts: 80
B
Shop Shark
Originally Posted by 69Cuda
in my opinion (others may chime in as well) you need to do both front and rear since on a big bolt, most if your braking happens at the rear axle as opposed to a car or light duty truck where most braking is done at the front axle.

That said, 55 and earlier have the 5/10 lug setup, where in 56, they went to the 6 lug pattern. I may be beneficial if you are making them, to have an option of bolt pattern.





While i agree with you 100% offering a rear disk kit first would seem... strange to most. One step at a time, first front and if that works well then rear. When the time comes ill be collecting information on rear axles and differences between them so everyone can benefit from it.

My idea for the front would have included all designs if possible (1.5/2ton) with different lug patterns, I would like to be able to help everyone out with their project as much as possible since these trucks are so neglected in the upgrade/ parts department.


THE BLACK VIKING
1958 Viking 60 ~ my new toy hauler

1954 GMC 350 (2ton)
Nick named "BIG UGLY" due to the rust, faded paint, and IMO the ugly flared "mustache" grille surround.

My Current fleet: 1954 GMC 350, 1956 chevy pickup, 1958 Viking 60, 1969 mach 1, 1970 chevelle, 1970 skylark custom, 1971 nova, 1989 mustang GT, 2020 panigale v4.

Keep 'em rollin fellas!
Re: Big Bolt Brake Solution!
BlackViking60 #1371526 Fri Jul 31 2020 08:05 PM
Joined: Jun 2011
Posts: 3,797
E
Shop Shark
GMC discs are available for the 5/10 on 7.25" bolt pattern.

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.
Re: Big Bolt Brake Solution!
EdPruss #1371549 Fri Jul 31 2020 11:45 PM
Joined: Oct 2019
Posts: 294
T
Shop Shark
EdPruss, please tell us where these discs are for sale and who sells them? Simply stating they are available doesn’t help anyone are you talking about the GM 3500HD front discs from 1994 to 2000? This isn’t the same center pilot circle as our older trucks. Such a conversion isn’t a bolt on and would require different rims and much more. I’d love to buy a disc conversion for a 1.5 ton, but so far I’ve not seen any info whatsoever that shows a decent conversion.

Last edited by Tony292; Fri Jul 31 2020 11:49 PM.
Re: Big Bolt Brake Solution!
BlackViking60 #1371550 Fri Jul 31 2020 11:54 PM
Joined: Jun 2005
Posts: 228
W
Shop Shark
https://www.rockauto.com/en/catalog/chevrolet,1998,c3500+pickup,7.4l+v8,1303490,brake+&+wheel+hub,rotor,1896

See if that link works

1991-2002 Chevrolet made the c3500hd. It was a 15000 gvw truck. They use the same 5/10 on 7.25 bolt pattern as our AD big bolts. The had discs all the way around and would be a good source for parts.

I've got the dana80 rear axle out of one, and plan on turning the hubs down to 4.75" diameter so our original 20" wheels would bolt up to a modern disc brake rear axle with a ton of different gear options and plentious parts.


'66 c10 rust bucket, 350 nv4500 stock bellhousing, '85 c30 front suspension, h072 rear axle with 3/4 ton rear coil springs
'67 cj5 225 oddfire motor, time for disc brake conversion, offset rear dana 44, intermediate pedals and steering upgrade
'48 3804 frame and bed + '52 6400 cab and front clip + 4bt, need to put them together
Re: Big Bolt Brake Solution!
BlackViking60 #1371551 Fri Jul 31 2020 11:57 PM
Joined: Jun 2011
Posts: 3,797
E
Shop Shark
Tony,

GMC factory parts for P-3500 HD solid front axle trucks. Build proper sized spacer for rotor ID to fit front spindle/rear hub diameter, use companion calipers, clamp to rotor with air, build mount.

Probably need power brakes or hydrovac, min. 19.5 wheels. Not a hardware store exercise, but I'm sure there is someone in Idaho they could do that. Good luck.

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.
Re: Big Bolt Brake Solution!
EdPruss #1371566 Sat Aug 01 2020 01:10 AM
Joined: Oct 2019
Posts: 294
T
Shop Shark
I think it would be easier to just swap in the entire front 3500HD axle and deal with adapting the steering and lead spring mounts than to try and cobble together the brakes over from the new axle to the old.

Re: Big Bolt Brake Solution!
BlackViking60 #1371577 Sat Aug 01 2020 02:26 AM
Joined: Jun 2011
Posts: 3,797
E
Shop Shark
Might be too wide, that is why Grigg's idea with P-30 spindles works.

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.
Re: Big Bolt Brake Solution!
BlackViking60 #1371581 Sat Aug 01 2020 03:31 AM
Joined: Jul 2020
Posts: 80
B
Shop Shark
Basically my thoughts are to keep it simple, & easy. Literally no thought process. If you can turn a wrench you can install the setup. Unbolt your old spindle take it right off the axle bolt on a complete ready to ride spindle, hook up your new brake hose and you're done. (Figureatively speaking) we all know that the brakes have to be bled, the wheels have to be put back on master cyl needs to be changed etc. My idea is to take out all the guesswork for everyone else when it comes to the hardware, no need to piece together, modify, research what will and wont fit correctly. I want it to help people with their projects. These trucks were fantastic back in the day but, speed limits have increased, traffic has increased, stopping distance needs to decrease. Our 1/2 ton counterparts are lightyears ahead we are basically sitting in the stone age. Ideally, when im "done" ill have updated front & rear brakes, steering, and powertrain swap. Ready to 100% modernize your big bolt. Im using mine as the guinea pig and hopefully everyone can benefit from it. Thats why i put out this feeler, to see if im making a one off set or if everyone wants a piece of the pie.


THE BLACK VIKING
1958 Viking 60 ~ my new toy hauler

1954 GMC 350 (2ton)
Nick named "BIG UGLY" due to the rust, faded paint, and IMO the ugly flared "mustache" grille surround.

My Current fleet: 1954 GMC 350, 1956 chevy pickup, 1958 Viking 60, 1969 mach 1, 1970 chevelle, 1970 skylark custom, 1971 nova, 1989 mustang GT, 2020 panigale v4.

Keep 'em rollin fellas!
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Moderated by  69Cuda, Grigg 

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