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Old 12-23-2014, 08:17 AM   #1
70's luvr
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Brake booster question

I'm up grading my 1970 3/4 ton from drum to disc in front so I ordered a 1972 booster/master cylinder combo from Advanced..figuring 72 had disc up front so it should all bolt right up...or not.

What I bought.



what came off my truck.



My original booster was bad so that's what prompted my combo purchase. The issue is the rod is longer on my new booster. Do I need a different bracket (longer) from a 72 to make this work? Should I just get a 1970 booster and then a 72 master?
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Old 12-23-2014, 09:45 AM   #2
Steve Cole
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Re: Brake booster question

You can buy an adjustable rod and adjust it to give you the same overall length you currently have.
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Old 12-23-2014, 11:21 AM   #3
70's luvr
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Re: Brake booster question

Okay Steve that gives me one option.

Looks like a longer bracket would be the cheapest. Does a 73-87 bracket accomplish the same thing? I passed a scrapyard yesterday with that model out front.
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Old 12-23-2014, 01:52 PM   #4
FirstOwner69
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Re: Brake booster question

As I recall, the 71/72 disc booster bracket mounts the booster farther from the firewall. They also added a couple braces from the booster to the firewall which were probably needed for additional support. Here is a picture (top) showing the braces. If you look for the braces, the "flat" one for the 3/4 ton is different (longer) than the 1/2 ton version (see 2nd picture for comparison). Unfortunately, I don't have a picture from the side showing the mounting brackets.

EDIT: Here's a link to a thread that shows a side view in post #4. It's a half ton but the bracket is the same. http://67-72chevytrucks.com/vboard/s...d.php?t=628830
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Last edited by FirstOwner69; 12-23-2014 at 02:03 PM.
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Old 12-23-2014, 02:01 PM   #5
67 cst swb
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Re: Brake booster question

Tuckers in Las Vegas has power booster/master cyl/prop valve/bracket assy on sale right now... part# FPB-6772
check it out:
http://www.tuckersparts.com/Power-Br...-FPB-6772.html
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Old 12-23-2014, 08:37 PM   #6
JimKshortstep4x4
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Re: Brake booster question

The longer booster to firewall brackets will make your booster combination work. It does push the assembly forward as can be seen in the attached photo.

Jim
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Old 12-23-2014, 09:25 PM   #7
scampr
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Re: Brake booster question

You have me thinking which usually gets me in trouble.... would the old unit you have fit on a 67 C30 , i have a manual brakes and the old legs are getting weaker.
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