![]() |
|
![]() |
#1 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,382
|
Disc Brake Conversion
I'm trying to use the link for brakes, but it doesn't work. I get this message below. And I can't paste the screenshot into the contact field information.
Anyway. I'm looking to upgrade my '70 C20 Chevy (8 lugs) to disc brakes. I don't see anything at Summit except 6 lug stuff. I know what I need, just need to know where to get it. I think maybe the least expensive would be to dogrob the parts from a truck that will fit mine- what years, I don't know. I also don't know if they will work with 16.5" steel wheels, but I think they should. If I still worked as a mechanic, I'd know this information cold, but I left that occupation as a living in 1984 when I went to work as an engineer. Any pointers? Thanks in advance.
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Jan 2016
Location: Saskatchewan
Posts: 357
|
Re: Disc Brake Conversion
Go to CPP they have lots of quality options.
__________________
1972 C10 - It might be old, but it's not slow |
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Jul 2013
Location: Rockwell, NC
Posts: 1,639
|
Re: Disc Brake Conversion
We must have very differing definitions of "quality."
__________________
1970 C-10 LWB "Blu" Instagram (current build pictures) 70_nc_c10 |
![]() |
![]() |
![]() |
#4 |
Registered User
Join Date: Feb 2016
Location: lebanon
Posts: 9
|
Re: Disc Brake Conversion
On my 68 c30, I ended up buying a 73 suspension clip for $80. Going to my napa and buying everything brand new putting it all together and then bolting it in, in an afternoon. Total bill was about $340. Lifetime warranty on bearings, seals, calipers, pads, and steering linkage if you go with ncp(better line).
|
![]() |
![]() |
![]() |
#5 |
Registered User
Join Date: May 2006
Location: Frankfort, Kentucky
Posts: 508
|
Re: Disc Brake Conversion
I believe you can use 71-72 8 lug spindles out and change the upper/lower ballpoints. I know you can swap the73/87 front crossmember but do not know if you can swap any of the individual parts or not. There are a lot of knowledgeable people on here. Maybe one of them will chime in.
|
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Dec 2015
Location: Central Coast, California
Posts: 207
|
Re: Disc Brake Conversion
The 16.5's will clear the calipers, so will 16's.
15's will too, with a sh*t pot of grinding, which I don't understand why anyone would do. Little pricey https://www.performanceonline.com/63...-deluxe-8-lug/ A guy sent me this about doing a disc swap back when I was asking. OPTION 1: get the spindles only from a 71-72 up truck, get new ball-joints to match the year of the spindles, new calipers or rebuild, turn rotors or buy new rotors, new bearings, throw it together. Use the donor upper ball joint, taper is different on upper, lower is the same. Use the donor lines, you'll need a disc/drum proportioning valve, don't skip this unless you enjoy changing calipers a lot! The control arm bushing are a bear to remove, they screw in/out and the lower arm bushing bolts have a small weld bead on each. Not sure if it was factory or not. Retorque to 230 ft/lb. OPTION 2: get a whole crossmember from a later model truck. I'm sure someone will chime in and give you more info. Good luck. . |
![]() |
![]() |
![]() |
#7 | |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,382
|
Re: Disc Brake Conversion
Quote:
A crossmember from a later truck sounds nice, too. Especially if it had all the parts in question in better condition. I hate to do that though, that is heavy work for my back that I trashed doing that kind of work, years ago.
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
|
![]() |
![]() |
![]() |
#8 |
Senior Member
![]() Join Date: Sep 2007
Location: Albuquerque NM
Posts: 7,848
|
Re: Disc Brake Conversion
if you need the 3/4 ton lower control arms just let me know
//////////////////////////////////////////////////////////////////
__________________
1967custom |
![]() |
![]() |
![]() |
#9 |
Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,269
|
Re: Disc Brake Conversion
Any of the post you read about changing to disc from the 73-87 trucks will work on the 3/4 and 1 ton stuff too you just need to make sure your doing 3/4 to 3/4 or 1 ton to 1 ton same as you would make sure it is 1/2 ton stuff if you were doing a 1/2 ton. Does that make sense? You can get your stuff from a donor [newer truck] and then break down the components so your not dealing with a bunch of weight at once and not having to remove the motor to change crossmembers. You can change the control arms out and then put the newer spindles back just as if you were rebuilding the front. If you turned wrenches long ago it is still the same stuff it was back then just older and greasier. Good luck Jim
|
![]() |
![]() |
![]() |
#10 | |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,382
|
Re: Disc Brake Conversion
Quote:
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
|
![]() |
![]() |
![]() |
#11 |
Registered User
Join Date: May 2015
Location: Cedar Vale, KS
Posts: 10
|
Re: Disc Brake Conversion
I recently put disc brakes on my 67 GMC C20. I used the disc brakes off of an 83 Chevy 3/4 ton. We used 83 spindles, ball joints, the whole tie rod (inner tie rod end, connector, and outer tie rod end), rotors, calipers, and brake hoses.
|
![]() |
![]() |
![]() |
#12 |
Registered User
Join Date: Jul 2013
Location: Fresno, ca
Posts: 303
|
Re: Disc Brake Conversion
I bought the 8 lug kit from pol. It came with everything I bought new hard lines too. I haven't installed it yet but the only thing extra I had to buy is springs and shocks. It took forever to get delivered but I feel it's worth the money since it also came with a new master cylinder, booster, tie rods, and ball joints.
__________________
1972 gmc c15 short bed... Sold 1970 chevy custom camper patina daily driver |
![]() |
![]() |
![]() |
#13 |
Registered User
Join Date: May 2015
Location: Cedar Vale, KS
Posts: 10
|
Re: Disc Brake Conversion
I had an 83 Chevy that I had rolled which I took the parts I needed from. I also used the master cylinder from the 83. I found a 72 brake booster and mount at a junkyard and used it.
|
![]() |
![]() |
![]() |
#14 | |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,382
|
Re: Disc Brake Conversion
Quote:
Thanks for the responses folks, I appreciate it.
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
|
![]() |
![]() |
![]() |
#15 |
Registered User
Join Date: May 2015
Location: Cedar Vale, KS
Posts: 10
|
Re: Disc Brake Conversion
I needed the mount and booster so it would sit low enough to not hit the hood and I decided to see if the 83 master cylinder would work with the 72 mount and booster, becuase it didn't have a master, which it did.
|
![]() |
![]() |
![]() |
#16 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,382
|
Re: Disc Brake Conversion
Ended up with the POL kit. Came with bent seals and caps, and missing parts. Had to flog it some, but it's OK, now. I rebuilt the front end while I was in there. All the stuff was original from 1970- riveted ball joints and all! It rides a lot better, now, as I also put new shocks on. Now that I have a new travel trailer, I have to go through it to make it more than a sad driveway queen.
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
![]() |
![]() |
![]() |
#17 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
|
Re: Disc Brake Conversion
On my '70 I bought a complete front disc setup (spindles, control arms, tie rods, everything but the crossmember) for $300 delivered and rebuilt and installed it, works great, and it's factory-engineered for this truck, so you really can't go wrong with factory parts if the interchange is right!
That requires, of course, that you can find one. But since ALL trucks went disc, pretty much any rusty old beater C20 on a farm has the parts you need.
__________________
1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
![]() |
![]() |
![]() |
Bookmarks |
Tags |
disc brake conversion, disc brake conversion kit |
|
|