| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,077 Posts1,056,017 Members48,433 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Mar 2005 Posts: 121 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2005 Posts: 121 | Slow going on the bodywork but slowly making progress. I've been looking at the brakes and I don't like the single master cylinders the 66 and older trucks came with and would like to update to a 67 or newer double style. For the time being I won't be getting into disc or even power brakes, I just want a simple replacement of the master cylinder for safety reasons. Truck is a 66 GMC 1/2 ton with manual drum brakes. Has anybody done the same swap and what did you use?
Dave
66 GMC- father /son project with the "GMC KID"
36 Chevy PU- 4x4 lifetime project
64 Skylark- wife says its hers
| | | | | Joined: Nov 2004 Posts: 1,552 Shop Shark | | Shop Shark Joined: Nov 2004 Posts: 1,552 | Dave:
Converting to power brakes on the '64-'66 Chevy truck is a dramatic upgrade of the stock braking system on these trucks and the parts are readily available. Additionally, you can use your single chamber master cylinder. If you install a dual chamber master cylinder, it will likely be coupled with a power brake booster, I believe, therefore you may as well go with a factory power brake booster. Good luck with your project.
Tony | | | | | Joined: Sep 2003 Posts: 2,384 Shop Shark | | Shop Shark Joined: Sep 2003 Posts: 2,384 | A 67-8 master for manual brakes will fit either the stock 64-66 booster or straight to the firewall IIRC. If you decide to go disc a 71-2 manual master fits the stock 64-66 booster. There is a TEE in the brake line under the engine, replace this with a coupler to couple the front lnes back together, then add the second line down to the rear line that was previously attached to the TEE. Brian | | | | | Joined: Aug 2005 Posts: 124 6 heaven | | 6 heaven Joined: Aug 2005 Posts: 124 | What does IIRC mean in the previous post? Thanks | | | | | Joined: Sep 2003 Posts: 2,384 Shop Shark | | Shop Shark Joined: Sep 2003 Posts: 2,384 | If I Recall/Remember Correctly,, | | | | | Joined: Apr 2007 Posts: 19 Junior Member | | Junior Member Joined: Apr 2007 Posts: 19 | Is that true about the 67-68 mc being a direct bolt in? Is the push rod length the same also? I have been contimplating how to get my '66 over to a dual circuit system. That would certainly probably be the easiest and cheapest way. | | | | | Joined: Mar 2005 Posts: 121 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2005 Posts: 121 | Originally posted by 66hayhauler:
Is that true about the 67-68 mc being a direct bolt in? Is the push rod length the same also? I have been contimplating how to get my '66 over to a dual circuit system. That would certainly probably be the easiest and cheapest way. Those are my concerns, I might have to head off to the boneyard this weekend and see if I can find a 67-8 to snag some parts from. Don't want to get into problems with pushrod lengths etc if I can avoid it now. Might look at finding a power booster too if it is just a simple bolt on. I know the drum system isn't perfect but can't afford and don't have the time for too many upgrades right now. Son will be 16 in September and he wants to be driving so I need the truck safe and legal by then.
Dave
66 GMC- father /son project with the "GMC KID"
36 Chevy PU- 4x4 lifetime project
64 Skylark- wife says its hers
| | | | | Joined: Nov 2005 Posts: 248 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2005 Posts: 248 | I used a dual master from a '67 purchased from NAPA. I had to extend the linkage using a barrel nut, but it worked fine. | | |
|
|
| |
