The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 09-14-2008, 10:13 PM   #1
Fubar
Registered User
 
Fubar's Avatar
 
Join Date: Dec 2003
Location: Santa Rosa ,CA
Posts: 96
Drum vs. Disk brake line size

I have a 69 k10 that I am converting from drum manual brakes to power disc brakes. I have a 3/4 ton booster, m/c and proportioning valve in place, and need to hook up the brake lines to the proportioning valve on the outlet side but the old lines are different size's. I'm wondering if anybody can tell me the right way to connect them.
Fubar is offline   Reply With Quote
Old 09-15-2008, 05:34 AM   #2
JimKshortstep4x4
Senior Member
 
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
Re: Drum vs. Disk brake line size

Here is a picture of a 3/4 ton power brake booster as installed. Note the front reservoir of the MC goes to the rear of the prop valve and the rear brake line is routed out the of the rear of the prop valve using 1/4" line.

The rear reservoir goes to the front of the prop valve and is routed to the front discs using 3/16" line from the prop valve.

Jim
Attached Images
 
__________________
1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end
1965 Impala SS 400 sbc, Muncie rock crusher
1966 Impala SS 396 bbc, TH 400
1969 El Camino, 350 sbc, TH 350
1971 Snowplow built on a Blazer frame
1972 GMC Short bed, stepside, TH 400, 427 BBC
JimKshortstep4x4 is offline   Reply With Quote
Old 09-15-2008, 04:44 PM   #3
Fubar
Registered User
 
Fubar's Avatar
 
Join Date: Dec 2003
Location: Santa Rosa ,CA
Posts: 96
Re: Drum vs. Disk brake line size

Thank you for the help. And the pic. helps alot too.
Fubar is offline   Reply With Quote
Old 09-15-2008, 05:59 PM   #4
chevy_mike
Never Ending Projects
 
chevy_mike's Avatar
 
Join Date: Jul 2006
Location: San Diego, CA
Posts: 3,836
Re: Drum vs. Disk brake line size

Here's a question that I have. Currently my '68 has drums all around. I am swapping everything over to 4 wheel discs. I found in another post that I can use the factory '68 distribution valve but does it matter if all of the hard lines are 1/4"?

I know later disc/drum trucks use 3/16" lines for the disc and 1/4" for the drum but since I am going all four disc, I would think it should not matter that the lines are 1/4" all around instead of 3/16" all around.

Any thoughts?
__________________
.
1965 C10 Panel, Tiki Express http://www.67-72chevytrucks.com/vboa...d.php?t=506580 SOLD
1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD
1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD


We were given two ears and one mouth for a reason... listen twice as much and speak half as often...
chevy_mike is offline   Reply With Quote
Old 05-20-2010, 10:03 AM   #5
66_k10_manny
Registered User
 
Join Date: Apr 2010
Location: san jose, ca
Posts: 86
Re: Drum vs. Disk brake line size

I have a 66 k10. Im only putting disc brakes on the front and leaving my stock rear drum. My brake line size is all the same. Do I need to change one of the lines to accomodate the disc brakes?
66_k10_manny is offline   Reply With Quote
Old 06-10-2011, 12:19 AM   #6
mmmBoost
Registered User
 
Join Date: Jan 2011
Location: Wisconsin
Posts: 224
Re: Drum vs. Disk brake line size

good info
__________________
Always remember those that had your back
Never forget those that turned it

Demon 68- C20 (conv. 5 lug) 406sb, TH400, 12 Bolt,

Red Slut 09- 1500 Crew Cab Z71, 2.5" Lift, Comp Cam, Deleted AFM/DoD, Diablo tuner
mmmBoost is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 02:56 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com