FMJ Brake Booster in a B-Body?
#2497545
05/18/18 01:58 PM
05/18/18 01:58 PM
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Slantytown
DUFFMAN
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OP
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I still know where there are a number of FMJ cars in a junkyard. I was wondering if there would be a fit up issue with a brake booster sourced from one of these cars on my 1972 B-Body?
No longer taking $h!t from anyone!
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Re: FMJ Brake Booster in a B-Body?
[Re: DUFFMAN]
#2497608
05/18/18 05:25 PM
05/18/18 05:25 PM
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Joined: Jan 2003
Posts: 1,500
Bradenton, Fl 34203
Kilroy was here
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,500
Bradenton, Fl 34203
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If you're looking for a cost effective way, I put an Advance Auto booster on mine, works fine. 70 B body. Price was reasonable.
Last edited by Kilroy was here; 05/18/18 05:26 PM.
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Re: FMJ Brake Booster in a B-Body?
[Re: BDW]
#2497660
05/18/18 07:44 PM
05/18/18 07:44 PM
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Slantytown
DUFFMAN
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I can't image a 40 yr. booster from JY would be good.
As mentioned, go to RockAuto or local parts store and get one. I was thinking that after I posted this. However, even a rebuilt FMJ booster is more reasonably priced than one for a 1972 B-body. Also, since I don't have a core to exchange, the core charge is much lower. So it still would be advantageous to use the newer booster if it will fit.
No longer taking $h!t from anyone!
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Re: FMJ Brake Booster in a B-Body?
[Re: moparx]
#2497854
05/19/18 01:01 PM
05/19/18 01:01 PM
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Joined: Jan 2005
Posts: 4,405
Michigan
MarkZ
Worthy
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Worthy
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Michigan
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keep in mind the diameter of the FMJ booster doesn't interfere with the hood closing. it may be close on some applications.  It'll certainly hit the valve cover if a big block is in the car. All F/M/J boosters are two bolt master cylinders. When I did the BB swap in my car I was able to source a booster from a late 70's (something with a big block, forget) and it was the smaller diameter kind. Only ran me $50.
1987 Fifth Avenue - 512/518/D60
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Re: FMJ Brake Booster in a B-Body?
[Re: DUFFMAN]
#2497928
05/19/18 06:07 PM
05/19/18 06:07 PM
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Joined: Jan 2003
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md
mopars4ever
I Live Here
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I Live Here
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md
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All F/M/J boosters are two bolt master cylinders. 76 and 77 F body is 4 bolt master cyl. Even so I still think there is a difference between the 72 b body and the F body boosters.
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Re: FMJ Brake Booster in a B-Body?
[Re: Joe12459]
#2498147
05/20/18 10:48 AM
05/20/18 10:48 AM
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Joined: Mar 2005
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Slantytown
DUFFMAN
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I put an FMJ booster/master cylinder in my 72 big block RR. Fits right in, no mods. Awesome. Thank you! On more question. Is there a reinforcement plate between the booster and the firewall? If there is then I will probably have to source that from a junkyard.
No longer taking $h!t from anyone!
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Re: FMJ Brake Booster in a B-Body?
[Re: DUFFMAN]
#2498197
05/20/18 01:17 PM
05/20/18 01:17 PM
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Posts: 19,355
north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
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north of coder
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duffer, glad the news is good for ya ! i remember using a late 70, early 80 ish booster, M or J, i can't remember which, on my 64 belvedere post car which required a slight ovaling of the original firewall through hole, and drilling a couple of extra mounting holes, and if i remember correctly, there was a stiffening plate, but that was way back in the late 80's, early 90's, so don't take that as gospel. my brain is loosing memory space. the car had a poly motor, and there were no clearance issues at all with the big diameter booster.
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Re: FMJ Brake Booster in a B-Body?
[Re: moparx]
#2498380
05/20/18 09:19 PM
05/20/18 09:19 PM
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Joined: Mar 2005
Posts: 11,269
Slantytown
DUFFMAN
OP
Ask And Ye Shall Receive
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OP
Ask And Ye Shall Receive
Joined: Mar 2005
Posts: 11,269
Slantytown
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duffer, glad the news is good for ya ! i remember using a late 70, early 80 ish booster, M or J, i can't remember which, on my 64 belvedere post car which required a slight ovaling of the original firewall through hole, and drilling a couple of extra mounting holes, and if i remember correctly, there was a stiffening plate, but that was way back in the late 80's, early 90's, so don't take that as gospel. my brain is loosing memory space. the car had a poly motor, and there were no clearance issues at all with the big diameter booster. After almost 3 years I've got my Coronet back out of storage and I'm tinkering with it again which is been very therapeutic. However, I have 2 teenage kids and their activities, especially during the summer, can get expensive. This is why I'm looking for inexpensive ways to do upgrades.
No longer taking $h!t from anyone!
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