Power Brake Booster Adapter Bracket

[jlsanborn]

I've got a '67 that had drum/drum and is still column shift. I've swapped to disc up front and am ready to go power. What is the advantage to your adapter vs. an aftermarket booster / cylinder combo? I'll be small block eventually and will ditch the column shift, but for now it'll have to work. Explain why I should use your adapter and what other parts i'll need to get or fab.

[jlsanborn]

Whoa Captianfab, I just spotted that you're just over the river!

[Captainfab]

Well as far as aftermarket booster brackets, mine is the only one that is a direct bolt on, with no hole drilling required. Plus mine does not locate the booster and master so far from the firewall as the factory style brackets do. But this is the reason mine will not work with the column shift. Once you have a compatable booster and the correct master for your braking system, you will have to extend the booster pushrod to connect with your brake pedal.

Yep, I'm not too far from you.

Originally Posted by jlsanborn

I've got a '67 that had drum/drum and is still column shift. I've swapped to disc up front and am ready to go power. What is the advantage to your adapter vs. an aftermarket booster / cylinder combo? I'll be small block eventually and will ditch the column shift, but for now it'll have to work. Explain why I should use your adapter and what other parts i'll need to get or fab.

[mmmBoost]

ttt

[Racinaround]

Did you ever get to the bottom of fit on the guy that had trouble fitting with auto column shift.
I didnt see anything?

[Captainfab]

I'm not sure I understand what you're asking. With most vacuum boosters, this bracket will not work on a column shift truck. If you use a hydroboost, then it should not be a problem.

Originally Posted by Racinaround

Did you ever get to the bottom of fit on the guy that had trouble fitting with auto column shift.
I didnt see anything?

[Racinaround]

I thought there was a post saying there was a problem with column shift and for some reason I was thinking automatic not manual.
Just to make sure it has the bugs work out.
I'm going to get one

Do you use the 71 proportioning valve with the 2000 s10 master / booster?
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[mmmBoost]

I'm going to cut a V the shift lever under the booster and cock it over so it doesn't hit the booster and then just cut the linkage bar to fit. So instead of it being straight it'll lean inboard at the top. I'll post pics when I get mine done.

[Captainfab]

Yes there is a problem with the column shift. The shift lever hits most of the boosters that are used. Sounds like mmmBoost has an idea how to overcome the issue, but it sounds like he has not done it yet.

When I designed this booster bracket, I was working on a 4 speed truck that was going to be a floor shifter automatic. It did not dawn on me until after a member bought ont, that there was a problem with the column shifted trucks. Apparently this is why the factory brackets locate the booster so far from the firewall.

You can use any disc/drum proportioning valve and master with any of the compatable boosters.

Originally Posted by Racinaround

I thought there was a post saying there was a problem with column shift and for some reason I was thinking automatic not manual.
Just to make sure it has the bugs work out.
I'm going to get one

Do you use the 71 proportioning valve with the 2000 s10 master / booster?
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[Last_Paladin]

Originally Posted by Captainfab

I'm not sure I understand what you're asking. With most vacuum boosters, this bracket will not work on a column shift truck. If you use a hydroboost, then it should not be a problem.

I had a column shift bracket. Need to find a normal one.

[Jimbabwe]

Captainfab,
What is the depth of your bracket top and bottom?

Would the use of the '88-98 S10 (or similar) booster be essentially the same additional power as a 3/4 or 1 ton booster? It's just a matter of it being dual diaphragm?

Do you know the diameter of the boosters you recommend?

Does having the booster closer to the firewall lessen the stopping power of the power assembly because the arm is shorter and therefore has less leverage?

I ask because, before coming across your bracket, I was wondering why I couldn't just mount the booster directly to the firewall. I'm just thinking it looks better without that deep, ugly bracket, and I'm running the straight six with the stock air cleaner, so I need the clearance. I hate the look of the offset I6 air cleaner that puts it over the valve cover...hate it. Your bracket may be the way to go if I can make sure I'll have the air cleaner and throttle cable clearance (because of the I6). I'm using a Lokar floor shifter, so the column shift is not an issue.
Sorry for the twenty questions!
Thanks.

[Captainfab]

I don't have the dimensions of my booster brackets handy. I am at home now and all of the parts I fabricate are at my shop. I can get you some measurements tomorrow.

The S10's had an optional dual diaphram booster that is aproximately 9" in diameter. It is identified with the RPO code of JM3 or JM5. This booster is similar to the '67-'70 C20/30 boosters.

The diameter of the compatable boosters varies by application. I do not have a listing of those measurements.

The distance the booster is from the firewall has absolutely no bearing on the leverage applied by the brake pedal

Originally Posted by Jimbabwe

Captainfab,
What is the depth of your bracket top and bottom?

Would the use of the '88-98 S10 (or similar) booster be essentially the same additional power as a 3/4 or 1 ton booster? It's just a matter of it being dual diaphragm?

Do you know the diameter of the boosters you recommend?

Does having the booster closer to the firewall lessen the stopping power of the power assembly because the arm is shorter and therefore has less leverage?

I ask because, before coming across your bracket, I was wondering why I couldn't just mount the booster directly to the firewall. I'm just thinking it looks better without that deep, ugly bracket, and I'm running the straight six with the stock air cleaner, so I need the clearance. I hate the look of the offset I6 air cleaner that puts it over the valve cover...hate it. Your bracket may be the way to go if I can make sure I'll have the air cleaner and throttle cable clearance (because of the I6). I'm using a Lokar floor shifter, so the column shift is not an issue.
Sorry for the twenty questions!
Thanks.

[Jimbabwe]

Captainfab,
Just wondering if you ever got the dimensions on your bracket. The depth top and bottom from the firewall in particular. Thank you, sir!

[Captainfab]

Sorry I didn't get back to you........been really slammed.

The top of the bracket is a little over 1-3/4" out from the firewall, and the bottom is a little over 2-1/4" out. So it is 1/2" difference over a span of 5".

Originally Posted by Jimbabwe

Captainfab,
Just wondering if you ever got the dimensions on your bracket. The depth top and bottom from the firewall in particular. Thank you, sir!

[67ctener]

This will be a must when I am ready. Are you going to continue producing these?
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[Captainfab]

Yes, I plan on continuing to fabricate these.

[Jimbabwe]

Thanks!

[smartass12]

Originally Posted by mmmBoost

I'm going to cut a V the shift lever under the booster and cock it over so it doesn't hit the booster and then just cut the linkage bar to fit. So instead of it being straight it'll lean inboard at the top. I'll post pics when I get mine done.

Did you ever get around to the mod of your shift lever to see if that works?

[faribran]

Captainfab,
i purchased one of these brackets.. it works great.. i have a 3 on the tree manual.. i used the booster/MC from an Astro van.. i think i recall trimming the linkage a bit, but a little adjusting and it works like a charm.

[smartass12]

Originally Posted by faribran

Captainfab,
i purchased one of these brackets.. it works great.. i have a 3 on the tree manual.. i used the booster/MC from an Astro van.. i think i recall trimming the linkage a bit, but a little adjusting and it works like a charm.

Do you know the size of your booster? Want to see if this will work for me..thanks

[faribran]

i can measure it tonite.. and advise.

[faribran]

It appears to be 9in at largest diameter. I recall the end off one of the shift rods made contact with it but I trimmed it a minor amont
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[mmmBoost]

Originally Posted by smartass12

Do you know the size of your booster? Want to see if this will work for me..thanks

I actually ended up just grabbing a big A55 cresent wrench and bent it towards the front. It clears now but still have to get another linkage bar to see if it'll fit

[gonnuts]

Got mine mounted with auto. Steering column, looks way better.

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[gonnuts]

Here's another view.

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