| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,060 Posts1,055,833 Members48,426 | | 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!
| | 
#46939 06/27/2005 1:07 PM | Joined: Sep 2003 Posts: 343 Member | | Member Joined: Sep 2003 Posts: 343 | I am restoring a 54 GMC 1/2-ton Longbed PU and I am planning on installing power brakes with dual master cylinder. My truck currently has 4 wheel drum brakes and if I buy a power brake kit to work with my current setup, can I later upgrade my brake system to front disc brakes and still be able to use the same power brake system? I am asking since I see power brake systems for drum/drum, disc/drum, and disc/disc setups.
1954 GMC 1/2-ton Longbed
1971 Pontiac LeMans Sport
| | |
#46940 06/27/2005 1:51 PM | Joined: Oct 2003 Posts: 363 Member | | Member Joined: Oct 2003 Posts: 363 | Yes, you can upgrade, usually just a master cylinder change or changing a residual valve. | | |
#46941 06/28/2005 2:58 AM | Joined: Sep 2003 Posts: 343 Member | | Member Joined: Sep 2003 Posts: 343 | Well I would not mind adding a residual valve, but I would rather not buy another master cylinder. If that is the case I might better bite the bullet and buy the front disc brake kit and power brake upgrade all at once. Anyone care to recommend a kit or vendor for this type of upgrade?
1954 GMC 1/2-ton Longbed
1971 Pontiac LeMans Sport
| | |
#46942 06/28/2005 3:18 AM | Joined: Nov 2002 Posts: 55 Member | | Member Joined: Nov 2002 Posts: 55 | I bought a kit from Classic Performance Products (CPP) www.classicperform.com I asked the same question you have when I ordered the kit. The difference between drum/drum or disc/drum or disc/disc is the proportioning valve. In the CPP power booster kit, there is a proportioning valve attached to the master cylinder. When you want to convert to disc/drum, you swap in a new proportioning valve. The master cylinder and booster stay put. | | |
#46943 06/28/2005 12:34 PM | Joined: Sep 2003 Posts: 343 Member | | Member Joined: Sep 2003 Posts: 343 | LT, Did you go with the disc brake setup on your truck? If so, did you have any problem with the tires/wheel rubbing the calipers like they mention on the CPP site?
1954 GMC 1/2-ton Longbed
1971 Pontiac LeMans Sport
| | |
|
|
| |
