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Disc brake conversion question
#684130 Fri Oct 08 2010 02:20 AM
Joined: May 2010
Posts: 85
Danhami Offline OP
New Guy
Well i'm hoping i'm not beating this topic to apologies if i am.

I've got a 52 chevy 1/2 ton. looking into front disc conversions..."Brothers trucks" sells a conversion with everything i need minus a new master. do i need a new master or is this not necessary?? Also since i'm here, for those of you who have completed a conversion, does anyone have a recommendation for who i should purchase a conversion kit from?? All input is appreciated! Thanks guys!

Do something! Even if it's wrong!
Re: Disc brake conversion question
Danhami #684172 Fri Oct 08 2010 04:06 AM
Joined: May 2001
Posts: 8,386
Extreme Gabster
You will need a new master cylinder. I'd recommend buying a kit for that too. Go with the power booster also.

I put power disc brakes on the front of my '54 Suburban. I love the way it stops. I used the Performance Online kit for it.

I have also installed a CPP kit on another '54. Neither kit is a bolt in. You will have to do some mods. I had to cut and re-weld both MC brackets to get them where I liked it.

You can read about it here, about halfway down the page.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.
My TRUCKS website
Re: Disc brake conversion question
Cletis #684237 Fri Oct 08 2010 01:52 PM
Joined: Jun 2005
Posts: 1,925
Shop Shark
I got mine from Very complete and easy to install.$649

Re: Disc brake conversion question
gazim #684271 Fri Oct 08 2010 04:05 PM
Joined: Apr 2005
Posts: 1,808
Shop Shark
I have installed numerous disc brake kits from ABS in Orange, CA. Truck shop, Brothers, CPP and numerous others in So Cal also sell kits. The system will not work with the original MC. I also recommend a power booster.

1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
Re: Disc brake conversion question
rfs56trk #686890 Sun Oct 17 2010 01:43 PM
Joined: Mar 2009
Posts: 58
New Guy
I installed a disc brake conversion on my '53. It worked just fine. A direct bolt on. I did not use a booster with it. I did install a corvette dual master cylinder though. You do want to have a dual cylinder so you can run the front and rear brakes on separate lines. Good for safety.


Re: Disc brake conversion question
'54 Daily Driver #687413 Tue Oct 19 2010 01:57 PM
Joined: Dec 2009
Posts: 20
New Guy
Dan, I read about your disc conversion. I'm doing my '52 now.First off did you install new fluid lines or use adapters for the new calipers? Did you use a proportioning valve. I have disc front,drum rear. Will any 2 portal master work if it's gm?? Thanks in advance!!

Re: Disc brake conversion question
12181955 #687453 Tue Oct 19 2010 03:46 PM
Joined: Feb 2000
Posts: 4,235
Shop Shark
There is a science in master cylinder sizing, so no, not just anyone will do. The companies that sell brake kits ask a lot of questions, or they should, about the pedal type and ratio. They also need to know which caliper and what rear cylinder you are using.

Big bore cylinders apply more fluid at a lower pressure, so they take more effort.
Small bore cylinders apply more pressure but less fluid, so they take more pedal travel.

Ask the seller of the kit, they should know which one works with there system. Measure your brake pedal from the center of the pad straight down to the pivot pin, then from the pin to the point where the master cylinder rod meets it. Do a little math and you will have the pedal ratio.


Re: Disc brake conversion question
Joe H #687822 Wed Oct 20 2010 08:42 PM
Joined: Oct 2003
Posts: 5,161
Cruising in the Passing Lane
When I did mine I bought a kit based on mid-70's midsize GM parts. My rear axle came from a '73 Chevelle (wagon) so I bought rotors, calipers and master cylinder for a '73 Chevelle and used the multivalve from the same car.

I had first determined that the Chevelle and my truck weighed close to the same and had similar weight distribution. My thinking was that I was letting the factory engineers figure out details like master cylinder size and proportioning valve.

I'm still driving it eight years later so I think the approach worked.

Its true, I really don't do anything but browse the Internet looking for trouble... . . .
'55 1st GMC Suburban . '54 GMC 250 trailer puller project. '54 GMC 250 Hydra-Matic . '54 Chevy 3100 . '47 Chevy COE . and more...
Re: Disc brake conversion question
12181955 #688804 Sun Oct 24 2010 06:18 AM
Joined: Mar 2009
Posts: 58
New Guy

As I remember, I did not run totally new lines. I adapted the old lines to the corvette master cylinder. The folks that sold me the disc kit for the front also sold the porportioning valves as I kept the drums on the 1970 F100 rear axle. The company I bought everything from was in Washington State above Seattle but they're out of business. I'm certain folks like Classic Performance Parts in Southern California would have what you need.


Re: Disc brake conversion question
'54 Daily Driver #692209 Fri Nov 05 2010 07:57 AM
Joined: Apr 2008
Posts: 256
Shop Shark
So with the stock 3sp trans(possibly 700r4 havent decided yet if im going to do the converion or not) what booster set up will ineed or who brakets should i buy

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