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-   1958 T0 1960 Squarebirds - Disc Brake Conversion (http://squarebirds.org/vbulletin/forumdisplay.php?f=83)
-   -   Disc Brake Booster (http://squarebirds.org/vbulletin/showthread.php?t=12592)

jopizz 03-03-2012 12:36 PM

Disc Brake Booster
After going through the various threads regarding disc brake conversions I wasn't able to find the answer I was looking for. Does anyone know if a booster from a '67 Mustang would work as a replacement for the squarebird booster when converting to disc brakes. I'm trying to amass the parts so I can do the conversion and I can buy a new one relatively cheap.

simplyconnected 03-03-2012 02:30 PM

I don't think so. The older disk boosters are single-stage which makes them very wide. Squarebirds don't have a lot of real estate for width so we use a two-stage 8" booster which gives us ample boost but still keeps the diameter the same as our old drum brake boosters.

The hard part is not in the booster or M/C, it's the firewall bracket that raises the combination 5". Just about any one-inch M/C will work if it fits your booster.

I hope this helps. - Dave

jopizz 03-03-2012 05:44 PM


Thanks for the info. So I guess the most economic alternative is having Dewey's Booster Service modify my old one for disc brakes. Or is there a less expensive option.


ncbird 03-03-2012 06:28 PM

booster option
John, if you have a non air car and the original firewall booster there is another option. I have a non air car and looked at multiple routes including the dewey route. I finally settled on going with the dual 8in just as Dave says the bracket is the issue. I removed the bracket from the original and built a 1 1/2 in spacer between it and the new OID booster/MC. The purpose of the spacer is to get the correct geometry on the linkage. With this setup you use all your current linkage without modification. My combo valve mounts underneath. Just another idea.

jopizz 03-03-2012 07:36 PM


I have a '59 with the under dash booster but I have a couple '60 boosters laying around. Do you have any pictures of your setup and where did you get your booster.


simplyconnected 03-03-2012 10:25 PM


Originally Posted by jopizz (Post 63038)
...the most economic alternative is having Dewey's Booster Service modify my old one for disc brakes. Or is there a less expensive option...

I have a lot of respect for Dewey. He does nice work at a fair price. BUT, Old Irish Dave sells a 8" two-stage booster and M/C combination for under $200. +$25 will get it in chrome. These are MBM brand and guaranteed for life. He also sells combination proportioning valves in brass or chrome at the best prices in town.

Give OID a call and tell him I sent you. He's in NM at 575-544-4729. - Dave Dare

jopizz 03-03-2012 11:02 PM


Thanks. I was wondering what OID meant. The only reason I mentioned Dewey was because after seeing a picture of Eric's (DKheld) modified booster I liked how it looked more compact and factory than other combinations. Whether the performance is the same I'm not sure. The price with m/c and shipping is about the same for both. More decisions.


ncbird 03-04-2012 04:45 PM

mock up
John, here are a couple of pictures of my setup during mock up. I have been taking it on and off while working on the brake lines so yes the nuts are loose. This is the unit Dave mentioned except mine has a cosmetic upgrade. I looked at several options and finally decided that for me this was the most cost effective. The bracket extension is an MBM bracket for a Jeep that I cut down and had tig welded. Note that the adjusting rod fits the stock bell crank with adjustment available. Grant

simplyconnected 03-04-2012 05:34 PM

Grant, that's a very nice setup and it looks dynamite.

The main function of this firewall bracket is to raise the booster five inches.

Why? Because the old OEM booster was made for drum brakes and it needs to be nearly twice as large for discs. The steering column (and A/C plenum) is in the way.

So, Grant fabricated his own firewall bracket using two sections from other brackets, and connected them to a two-stage 8" booster. This booster is the same physical diameter as the old OEM, but it puts out twice as much boost (1,000-psi at 18"Hg with a 1" bore M/C). It turned out nice and he saved money.

Notice that Grant's M/C has crossed Cunifer lines. Each S-10 caliper has a piston that is 2-1/2" in diameter. So, if your M/C has a large and small reservoir, the large side gets plumbed to the front disc brakes. - Dave

lawyercalif 03-04-2012 06:01 PM

Do you think that setup using the Jeep bracket would work in an A/C car?

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