Disc Brake Conversion? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1970CustomC10350 · 05-24-2010, 08:45 PM

We ordered a kit from Classicparts for 1970 half ton last night. Typically besides the parts included in the kit what is required to finish the conversion? Our truck has power brakes if it matters. Will the stock master cylinder be O.K.?

raycow · 05-30-2010, 03:15 AM

If the kit doesn't include a disc/drum MC you are going to need one. You MAY need a proportioning valve, but try it without first. If the rears lock up too easily (and the fronts don't) that's the sign that you need a PV.

I don't know what else isn't in the kit. Does it include hoses?

Ray

PanelDeland · 05-30-2010, 07:40 AM

You probably want to check the Ball joints and the rest of the steering and suspension.During the swap is the time to replace bushings tie rod ends and such.No sense in tearing into it later to do that stuff.

1970CustomC10350 · 05-30-2010, 11:28 AM

Thanks for the replies. Here is a link to the kit we bought.
http://www.classicparts.com/1963-70-...info/71-978S6/
It has hoses, balljoints, tierods, calipers, rotors, bearings, and what not. We went ahead and ordered upper and lower A-arm bushings with spacers. I think with the kit and said parts the front suspension should be almost like new. Thats my goal anyway. Will a master cylinder from a 71 with disc brakes be appropriate or is there a better one for this application? If so will it bolt up to the 70's booster. Assuming the 71 master cylinder will work the proportioning valve would also?

On a side note these are my wifes trucks but I'm starting to enjoy them more and more.

**lolife99** · 05-30-2010, 12:33 PM

You need a disc brake master cylinder and porportoning valve.
The 71-72 version will work fine.
You may have to rebend or make the hard lines from the M/C to the frame.

72BlckButy · 05-30-2010, 09:09 PM

Don't forget the bearing grease!

SIXT8LOU · 06-02-2010, 02:28 AM

Quote:

Originally Posted by lolife99

You need a disc brake master cylinder and porportoning valve.
The 71-72 version will work fine.
You may have to rebend or make the hard lines from the M/C to the frame.

what about the brake lines? the 68 are in back and 72 in front of crossmember? whats the solutions.?? thanks

1970CustomC10350 · 06-02-2010, 11:04 PM

Thanks for the replys. Well we got the A-arm bushings but we are still waiting on the conversion kit. I'm going to wait until everything gets here before I begin tearing it apart. I checked at Autozone today and a new master cylinder for a 71 with disc brakes runs $35 so that isn't too bad. They don't list a proportioning valve so that will have to come from some where else.

**passthebuck** · 06-02-2010, 11:14 PM

In regards to the lines that run in front of the a-arms, I am converting my 67 to 71 running gear & I dont want to use special ECE hoses forever. I have bought the brakeline hangers that the hardlines stop at & the hoses start at. I intend of bolting or welding the hangers in the 71 spot on my 67 frame so that I can run a complete 71 hardline kit.

SIXT8LOU · 06-03-2010, 04:01 AM

Quote:

Originally Posted by passthebuck

In regards to the lines that run in front of the a-arms, I am converting my 67 to 71 running gear & I dont want to use special ECE hoses forever. I have bought the brakeline hangers that the hardlines stop at & the hoses start at. I intend of bolting or welding the hangers in the 71 spot on my 67 frame so that I can run a complete 71 hardline kit.

thanks,,,were did you pick up the hangers,,,i ve never seen them for sale anywhere.... thanks again

**passthebuck** · 06-03-2010, 07:47 AM

I found them at ECE.
http://www.earlyclassic.com/fullImag...Option=03-6491
They call them Brake Hose Brackets.
ECE sells the conversion hoses as well.

05-24-2010, 08:45 PM	#1
1970CustomC10350 Registered User Join Date: Nov 2008 Location: Kansas Posts: 47	Disc Brake Conversion? We ordered a kit from Classicparts for 1970 half ton last night. Typically besides the parts included in the kit what is required to finish the conversion? Our truck has power brakes if it matters. Will the stock master cylinder be O.K.?

05-30-2010, 03:15 AM	#2
raycow Registered User Join Date: Mar 2003 Location: San Francisco, CA USA Posts: 2,454	Re: Disc Brake Conversion? If the kit doesn't include a disc/drum MC you are going to need one. You MAY need a proportioning valve, but try it without first. If the rears lock up too easily (and the fronts don't) that's the sign that you need a PV. I don't know what else isn't in the kit. Does it include hoses? Ray Last edited by raycow; 05-30-2010 at 03:20 AM.

05-30-2010, 07:40 AM	#3
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,992	Re: Disc Brake Conversion? You probably want to check the Ball joints and the rest of the steering and suspension.During the swap is the time to replace bushings tie rod ends and such.No sense in tearing into it later to do that stuff. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

05-30-2010, 11:28 AM	#4
1970CustomC10350 Registered User Join Date: Nov 2008 Location: Kansas Posts: 47	Re: Disc Brake Conversion? Thanks for the replies. Here is a link to the kit we bought. http://www.classicparts.com/1963-70-...info/71-978S6/ It has hoses, balljoints, tierods, calipers, rotors, bearings, and what not. We went ahead and ordered upper and lower A-arm bushings with spacers. I think with the kit and said parts the front suspension should be almost like new. Thats my goal anyway. Will a master cylinder from a 71 with disc brakes be appropriate or is there a better one for this application? If so will it bolt up to the 70's booster. Assuming the 71 master cylinder will work the proportioning valve would also? On a side note these are my wifes trucks but I'm starting to enjoy them more and more.

05-30-2010, 12:33 PM	#5
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,700	Re: Disc Brake Conversion? You need a disc brake master cylinder and porportoning valve. The 71-72 version will work fine. You may have to rebend or make the hard lines from the M/C to the frame. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

05-30-2010, 09:09 PM	#6
72BlckButy Tot Roddin' Join Date: Apr 2005 Location: Mid-MO Posts: 24,461	Re: Disc Brake Conversion? Don't forget the bearing grease! __________________ -Nate 1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package)

06-02-2010, 11:04 PM	#8
1970CustomC10350 Registered User Join Date: Nov 2008 Location: Kansas Posts: 47	Re: Disc Brake Conversion? Thanks for the replys. Well we got the A-arm bushings but we are still waiting on the conversion kit. I'm going to wait until everything gets here before I begin tearing it apart. I checked at Autozone today and a new master cylinder for a 71 with disc brakes runs $35 so that isn't too bad. They don't list a proportioning valve so that will have to come from some where else.

06-02-2010, 11:14 PM	#9
passthebuck Sisyphus was my mentor! Join Date: Sep 2002 Location: Carleton Place, Ontario CANADA Posts: 984	Re: Disc Brake Conversion? In regards to the lines that run in front of the a-arms, I am converting my 67 to 71 running gear & I dont want to use special ECE hoses forever. I have bought the brakeline hangers that the hardlines stop at & the hoses start at. I intend of bolting or welding the hangers in the 71 spot on my 67 frame so that I can run a complete 71 hardline kit. __________________ passthebuck #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car

06-03-2010, 07:47 AM	#11
passthebuck Sisyphus was my mentor! Join Date: Sep 2002 Location: Carleton Place, Ontario CANADA Posts: 984	Re: Disc Brake Conversion? I found them at ECE. http://www.earlyclassic.com/fullImag...Option=03-6491 They call them Brake Hose Brackets. ECE sells the conversion hoses as well. __________________ passthebuck #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car

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