![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
|
![]() |
#1 |
Registered User
Join Date: Jan 2019
Location: Hampton Roads VA
Posts: 644
|
Disc swap - Soft hoses to front or leave in back?
Lets see if I can keep this straight:
1967 C20 Frame, control arms 1977 C20 spindles, hub/rotor assemblies, calipers 1967 had the drum brake lines on the back side of the upper control arms 1977 had had the disc lines coming up to the front of the upper control arms I saved the original soft lines from the 77 to compare/test fit. The banjo bolt (that came with new caliper) is too big to go through the square interestingly, im not sure why. Not sure if ill have to figure out a different part number. I did buy new calipers and I cant seem to find the old 77 calipers to compare. Basically my question here is what's the best route to take the soft lines? I'm thinking about following the 77 routing ill just have to see about drilling out holes on the front of the control arms and potentially reusing those clips. Not sure if new lines come with those or if my banjo bolt and block hole size gets cleared up. Pics would be great. Thanks
__________________
70 C20 Build link : Project Montezuma http://67-72chevytrucks.com/vboard/s...d.php?t=794479 How to repair that rusted out 67-72 c10-c30! Please subscribe! https://www.youtube.com/c/MaycoCustomRestorations |
![]() |
![]() |
![]() |
#2 | |
Registered User
Join Date: Jan 2019
Location: Hampton Roads VA
Posts: 644
|
Re: Disc swap - Soft hoses to front or leave in back?
Post for my records (& others). Still looking to find pics of how others did it. I may go out and buy both to see how I like it.
https://67-72chevytrucks.com/vboard/...ake+conversion Quote:
__________________
70 C20 Build link : Project Montezuma http://67-72chevytrucks.com/vboard/s...d.php?t=794479 How to repair that rusted out 67-72 c10-c30! Please subscribe! https://www.youtube.com/c/MaycoCustomRestorations |
|
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Mar 2020
Location: Portland, OR
Posts: 335
|
Re: Disc swap - Soft hoses to front or leave in back?
I have this setup (67 with 77+)
The soft line runs on the rear of the control arm using a stainless braided line. I think this is the best option if you don't plan to replace everything. As the post you made above pointed out, moving to the front will require modifying how the existing hard line routes. This isn't that difficult, but your post makes me think that it isn't your first choice. While it may work, I would not use a rubber line. The angle and length of the soft line means that it will likely contact the wheel or control arm at some point. It's nice insurance to have a braided exterior for abrasion resistance. |
![]() |
![]() |
![]() |
#4 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,526
|
Re: Disc swap - Soft hoses to front or leave in back?
When I did my conversion in my dually I kept the lines in the back. It was easier than going behind the frame rail, shortening and reflaring the line for the front. The bolt issue is you have a 7/16 bolt in your hand and have 10mm hole in the line. What thread is the caliper?
Last edited by kwmech; 03-28-2022 at 12:44 PM. |
![]() |
![]() |
![]() |
#5 |
Senior Member
![]() Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
|
Re: Disc swap - Soft hoses to front or leave in back?
__________________
![]() 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop |
![]() |
![]() |
![]() |
#6 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
|
Re: Disc swap - Soft hoses to front or leave in back?
You don't want that bolted to the upper control arm like that. It needs to be tied in at the crossmember.
Here's how I did mine when I swapped 1972 stuff over to a 1969 frame. http://67-72chevytrucks.com/vboard/s...&postcount=157 Gary
__________________
'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
Quote:
|
||
![]() |
![]() |
![]() |
#7 |
Registered User
Join Date: May 2016
Location: Oklahoma
Posts: 189
|
Re: Disc swap - Soft hoses to front or leave in back?
I'd run it like the factory did for '67-72 C20.
The real issue is that none of the reproduction hoses fit a C20. You might think they do, but at full lock and droop, the hose is stretched to the max. I paid to have my original hoses custom reproduced. They reused one of the square pads at the caliper, but had a NOS fitting for the other side. Cost me a bill, but at least it works and fits like factory....
__________________
1971 C20 Custom Deluxe, HT383, 4L80E, 3.73 Locker, 4 Wheel Discs |
![]() |
![]() |
![]() |
#8 |
Its a Truck Thing......
Join Date: Dec 2004
Location: Sierra Vista, Arizona
Posts: 3,159
|
Re: Disc swap - Soft hoses to front or leave in back?
I have seen two "rubber lines to the rear" converted trucks brake lines fail. Just as Bry593 stated above, the lines when going lock to lock get stretched and separate. One is a member here who was lucky to have his brake system fail in a parking lot and was able to prevent an accident from happening. I actually hauled his truck back to his house on my trailer. In the past when I convert my front drum trucks to disk, everything gets swapped over to 71/72 style. I order my lines from inline tube and then change the master/valve to meet the same model. I have not done a deep dive into why this is happening on the failing parts, but I have never had an issue doing it the 71/72 way. I am trying a 73 style on this 68 stepper since the crossmember came out of a squarebody. Not a fan of the valve location for the squares that is for sure. The truck is down to the frame so it is easy to overhaul components at the moment.
Smitty
__________________
71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time |
![]() |
![]() |
![]() |
#9 |
Registered User
Join Date: Jan 2019
Location: Hampton Roads VA
Posts: 644
|
Re: Disc swap - Soft hoses to front or leave in back?
So I decided to pick up the Duralast 88466 hoses from AutoZone and the 1977 C20 spec'd hoses from O'Reilly Part numbers (BH86550 / BH86551). That way I can put both on and just see how they fit. By the way both styles use 7/16" banjo bolts - so that problem is resolved.
These are the pics with the short Duralast 88466 hose which some members are using in the rear mount location. I did not like this at all so I ended up choosing the 77 style. There was way too much contact and I dont like the way it has to double back. I would not recommend that at all, the 77 style is way cleaner. Also I know the squarebody routes the brake lines to the front side of the cross member originally but I think ill just run the lines back to the rear of the cross member. Routing TBD.
__________________
70 C20 Build link : Project Montezuma http://67-72chevytrucks.com/vboard/s...d.php?t=794479 How to repair that rusted out 67-72 c10-c30! Please subscribe! https://www.youtube.com/c/MaycoCustomRestorations Last edited by May70; 04-02-2022 at 04:37 PM. |
![]() |
![]() |
![]() |
#10 |
Registered User
Join Date: Jan 2019
Location: Hampton Roads VA
Posts: 644
|
Re: Disc swap - Soft hoses to front or leave in back?
Drilled out the hole like the 77 has in the upper control arms and installed O'Reilly Part numbers (BH86550 / BH86551). Much happier with this - zero contact and the hose isnt bending back over itself.
__________________
70 C20 Build link : Project Montezuma http://67-72chevytrucks.com/vboard/s...d.php?t=794479 How to repair that rusted out 67-72 c10-c30! Please subscribe! https://www.youtube.com/c/MaycoCustomRestorations |
![]() |
![]() |
![]() |
Bookmarks |
|
|