cudak888
Well-Known Member
***Repost of 2016 thread w/photos restored***
Last night, I wound up doing a few forum searches, trying to figure out if I needed to change my firewall bracket for my disc brake (non-power) conversion (I was also inspired to do so after reading this thread).
After sorting through all the info I found, I realized that the firewall plate variants are really quite easy to understand - provided all the information is in one place, separated by year. But it isn't...so #newthread.
I compiled everything I could find and assembled the following chart below. For the sake of identification, I copied a few photos that I found here that demonstrate the differences, and credited the sources (hope you fellows don't mind), as I'm not lucky enough to own every single plate made.
Would also be glad to edit and update this as more information comes out. One of the things that I can't find yet is a photo of the bellcrank on a power brake-equipped '65 (which I'd assume are rather unusual to begin with).
1962-1965 B-Body:
Manual booster at left, power booster at right. Power booster requires bellcrank. Not reproduced. | Photo: moparmarks:
1966-1970 B-Body:
NOTE: 426 HEMI applications use manual master cylinder firewall plates and a much larger bellcrank that's built into the booster standoff (photos of this complete assembly shown in last section below).
Booster bracket for cars with manual master cylinders OR power brake HEMI 426 applications. Original shown. Not reproduced. | Photo: challengersteve
Power booster bracket for all applications excluding 426 HEMI.
Requires standard power booster bell crank without booster standoff.
Original, shown from reverse side Photo: 69bee:
1971-1974 B-Body + 1970-1974 E-body:
Booster bracket for cars with manual master cylinders OR power brake HEMI 426 applications.
Original | Photo: moparmarks:
Reproduction by Dr. Diff | Photo - Dr. Diff :
Power booster bracket for all applications excluding HEMI 426. Requires bell crank for proper operation.
Original | Photo: eBay, wolf-pack68
Reproduction (shown from the rear, rotated 90 degrees) | NOTE: Some sites show a stock image of this part, but show it six holes that don't appear to line up with the original. These places have Photoshopped the '66-70 power bracket to look like this.
Pedal rods, bellcranks, and other things you should see to know - 1962-74(ish):
Manual brake rod:
Manual brake booster rod shown on a 1968 B-Body:
Power booster w/bellcrank for 1966+ applications, bellcrank pivots from bottom. Note: I believe 1965 is inverted and pivots from the top, but have not found a photo of one | Photo: moparmarks:
HEMI 426 (factory Gen II) booster (Note manual brake plate mount and built-in bellcrank. Offset plate and oversized bellcrank currently reproduced). | Photo: Chattacuda:
That's it - six plates with eight unique factory applications, spread over three generations of B-bodies. Not really that complicated.
-Kurt
Last night, I wound up doing a few forum searches, trying to figure out if I needed to change my firewall bracket for my disc brake (non-power) conversion (I was also inspired to do so after reading this thread).
After sorting through all the info I found, I realized that the firewall plate variants are really quite easy to understand - provided all the information is in one place, separated by year. But it isn't...so #newthread.
I compiled everything I could find and assembled the following chart below. For the sake of identification, I copied a few photos that I found here that demonstrate the differences, and credited the sources (hope you fellows don't mind), as I'm not lucky enough to own every single plate made.
Would also be glad to edit and update this as more information comes out. One of the things that I can't find yet is a photo of the bellcrank on a power brake-equipped '65 (which I'd assume are rather unusual to begin with).
1962-1965 B-Body:
Manual booster at left, power booster at right. Power booster requires bellcrank. Not reproduced. | Photo: moparmarks:
1966-1970 B-Body:
NOTE: 426 HEMI applications use manual master cylinder firewall plates and a much larger bellcrank that's built into the booster standoff (photos of this complete assembly shown in last section below).
Booster bracket for cars with manual master cylinders OR power brake HEMI 426 applications. Original shown. Not reproduced. | Photo: challengersteve
Power booster bracket for all applications excluding 426 HEMI.
Requires standard power booster bell crank without booster standoff.
Original, shown from reverse side Photo: 69bee:
- Reproductions of '66-70 power booster brackets (the same thing above):
- Version #1, shown with bellcrank:
- Version #2, shown with bellcrank. Only apparent difference are the two extra holes. NOTE that I suspect this might be a vendor's Photoshop of a manual booster plate with the holes moved around, and that the only one you can actually get is the first version. Either way, it'll make no difference in operation:
1971-1974 B-Body + 1970-1974 E-body:
Booster bracket for cars with manual master cylinders OR power brake HEMI 426 applications.
Original | Photo: moparmarks:
Reproduction by Dr. Diff | Photo - Dr. Diff :
Power booster bracket for all applications excluding HEMI 426. Requires bell crank for proper operation.
Original | Photo: eBay, wolf-pack68
Reproduction (shown from the rear, rotated 90 degrees) | NOTE: Some sites show a stock image of this part, but show it six holes that don't appear to line up with the original. These places have Photoshopped the '66-70 power bracket to look like this.
Pedal rods, bellcranks, and other things you should see to know - 1962-74(ish):
Manual brake rod:
Manual brake booster rod shown on a 1968 B-Body:
Power booster w/bellcrank for 1966+ applications, bellcrank pivots from bottom. Note: I believe 1965 is inverted and pivots from the top, but have not found a photo of one | Photo: moparmarks:
HEMI 426 (factory Gen II) booster (Note manual brake plate mount and built-in bellcrank. Offset plate and oversized bellcrank currently reproduced). | Photo: Chattacuda:
That's it - six plates with eight unique factory applications, spread over three generations of B-bodies. Not really that complicated.
-Kurt
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