Bendix dual booster ID help
- Thread starter 66l78rat
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Is that your NOS Bendix booster? I believe you posted about that last year in the thread linked below. A larger picture may help as well. The numbers stamped are probably manufacturing numbers and have little to do with the catalogued part number, and it may be superceded to a later style number anyhow. The last 4 digits are probably a month and year date code.
If I recall correctly, there are two different sizes of Bendix booster for discs - the bigger being for C body, but again, I've just heard they're the same size. In this post linked here:
FYI B & C Body Bendix disc brake dual diaphragm boosters compared @PH27L7 recently did a comparison with a 1967 C body disc booster and a 1970 B body disc booster and found no discernable differences other than the main pushrod length, while @Davea Lux in the same post claims the 70 - 71 C body one one should be larger than the 1970 B body, but that the 1970 B body one can be made to work on a 65-68 C body with a pushrod length modification. Regardless, the smaller ones are 8 inches, and the diametre for the larger I think is 8.75 inches or 9 inches, but I don't know where that's measured... it's a tad confusing, but I don't worry about it because I have an original on both my cars, and a 3rd tucked away as a spare.
The Pirate Jack ones are still out there, and the verdict on those is not in yet.
FYI B & C Body Bendix disc brake dual diaphragm boosters compared
If I recall correctly, there are two different sizes of Bendix booster for discs - the bigger being for C body, but again, I've just heard they're the same size. In this post linked here:
FYI B & C Body Bendix disc brake dual diaphragm boosters compared @PH27L7 recently did a comparison with a 1967 C body disc booster and a 1970 B body disc booster and found no discernable differences other than the main pushrod length, while @Davea Lux in the same post claims the 70 - 71 C body one one should be larger than the 1970 B body, but that the 1970 B body one can be made to work on a 65-68 C body with a pushrod length modification. Regardless, the smaller ones are 8 inches, and the diametre for the larger I think is 8.75 inches or 9 inches, but I don't know where that's measured... it's a tad confusing, but I don't worry about it because I have an original on both my cars, and a 3rd tucked away as a spare.
The Pirate Jack ones are still out there, and the verdict on those is not in yet.
FYI B & C Body Bendix disc brake dual diaphragm boosters compared
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Yes its a NOS booster that im trying to ID. Ive been told its a 70-71 HD applications booster?Police? That info comes from a local police car guru.Its overall diameter is 8.75 inches and has longer pushrod so I know its for a C body not B but would like to know what years/cars its application for.
Imperial boosters used a longer pushrod than C bodies too in 1966 - 1968, but the parts book says they're the same booster between C body and Imperial for 69 - 70.
I was incorrect regarding my initial response and thinking it was a much later part number (which also happens to be the proper number stamped into the surface of the unit). I disregarded that at first because it was a late number - much later than I imagined a Bendix dual of that era could have.
Now that I'm looking in a 70 - 71 book, I see a fair amount of 3461 xxx numbers, so I was definitely wrong in my thinking there. The number 3461 034 on the box and what's stamped shows up in the brakes part section as the final entry in section 5 - 100 - 2 POWER UNIT, WITH DISC BRAKES 1970 (all C bodies and Imperial), with disc boosters for B bodies being a different part number, presumably for the shorter pushrod if the research by @PH27L7 shown in the other thread have all other elements being identical:
I am still not sure if these means that the larger of the 2 boosters will still work on C bodies - I think they do - but I'll have to check.
I was incorrect regarding my initial response and thinking it was a much later part number (which also happens to be the proper number stamped into the surface of the unit). I disregarded that at first because it was a late number - much later than I imagined a Bendix dual of that era could have.
Now that I'm looking in a 70 - 71 book, I see a fair amount of 3461 xxx numbers, so I was definitely wrong in my thinking there. The number 3461 034 on the box and what's stamped shows up in the brakes part section as the final entry in section 5 - 100 - 2 POWER UNIT, WITH DISC BRAKES 1970 (all C bodies and Imperial), with disc boosters for B bodies being a different part number, presumably for the shorter pushrod if the research by @PH27L7 shown in the other thread have all other elements being identical:
I am still not sure if these means that the larger of the 2 boosters will still work on C bodies - I think they do - but I'll have to check.
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70 parts manual.
PH27L7
Well-Known Member
A few clarifications from my end-
There's only one size stamped body on all the mopar tandem diaphragms that were made by Bendix throughout the years they were used, even for the earlier drum brake Imperials. I didn't have a caliper to measure but it came to roughly 9" which would likely be the 8-3/4" people are referring to. There was NO smaller OEM Bendix 8" unit ever used to the best of my knowledge; if someone knows of an example, please provide evidence.
I temporarily used a 1968 Imperial unit on my 1967 Fury while my original was being rebuilt.They interchanged perfectly although the check valve arrangement was different.
There's only one size stamped body on all the mopar tandem diaphragms that were made by Bendix throughout the years they were used, even for the earlier drum brake Imperials. I didn't have a caliper to measure but it came to roughly 9" which would likely be the 8-3/4" people are referring to. There was NO smaller OEM Bendix 8" unit ever used to the best of my knowledge; if someone knows of an example, please provide evidence.
I temporarily used a 1968 Imperial unit on my 1967 Fury while my original was being rebuilt.They interchanged perfectly although the check valve arrangement was different.
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Thanks - that's it - no evidence, only heresay. I'm pretty sure you're correct.
The Pirate Jack ones state theirs are only 8" across, which only adds to the confusion, but I eliminate those from any real consideration as they're aftermarket.
I had to have a pushrod cut down on one of my boosters to use on a 66, so from what you just said I can only figure that it was likely a 1969 or 70 IMP unit.
The Pirate Jack ones state theirs are only 8" across, which only adds to the confusion, but I eliminate those from any real consideration as they're aftermarket.
I had to have a pushrod cut down on one of my boosters to use on a 66, so from what you just said I can only figure that it was likely a 1969 or 70 IMP unit.
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