What year and model brakes are these?
- Thread starter JF900
- Start date
-
69 Dart Swinger with large pattern spindles. Is there a place where I can look up casting numbers?
valiantwagonguy
Well-Known Member
They look exactly the same as what is on my 76 Aspen
Would your calipers bolt right up to large pattern spindles?
Mbaird - yes, they are original mopar equipment and I'm good with their performance, but I'm trying to figure out what they are so I can pull service on them.
They’re definitely 73+ Mopar single pistons. They would have been part of a large bolt pattern brake set up. The slider mounts mean they could actually be off an A body, but they came on a bunch of other stuff too.
The thing to check would be the piston diameter. A-body 73-76 calipers had a 2.6” piston. Everything else has a 2.75” piston. But even those you pretty much have to measure, the look the same otherwise and use the same pads. Other than the caliper itself and hose length, pretty much everything brake and wheel related with the 73+ brakes is the same.
If you need to do a caliper service measure the piston and go from there.
The thing to check would be the piston diameter. A-body 73-76 calipers had a 2.6” piston. Everything else has a 2.75” piston. But even those you pretty much have to measure, the look the same otherwise and use the same pads. Other than the caliper itself and hose length, pretty much everything brake and wheel related with the 73+ brakes is the same.
If you need to do a caliper service measure the piston and go from there.
The last year A-bodies had 2.75" pistons for '76, they are identical to the F-body & other slider calipers, probably because they gained so much freakin' weight by then. I
took a set off of this hulk I stripped for a few parts before donating it to My local Mopar Yard Guy..........
took a set off of this hulk I stripped for a few parts before donating it to My local Mopar Yard Guy..........
Do you have some kind of factory documentation on that change?
I wouldn’t be surprised if it was true, ‘76 was the year that everything went disk up front so it’s totally possible the factory went with the same piston across the board too.
But finding a set of 2.75” piston calipers on one car 40+ years after it was built doesn’t mean it left the factory with them, and it certainly doesn’t prove that any other car did. The 2.75” piston bore calipers look just like the 2.6” calipers and they both use the same caliper brackets. The calipers are completely interchangeable, same with the brackets.
It has been listed this way for decades in the NAPA/Raybestos parts catalogs, back to the oldest I have from the late '80's. I didn't know that's what I had here because I
was told it was a '75 not a '76, it wasn't until I pulled it home w/the wrecker and actually looked that I realized it was a '76. Sure enough they mic'd 2.75", and looking at
them next to the 2.60" ones I have, they fit tighter to the center of the bracket. There's no way just eyeballing them on a table to know, and there's no guarantee that all
the calipers cast the same, so mic-ing them is the only real way....one of them is stamped "592"...didn't check the other. I picked that thing up for the LBP 7.25" Rear &
the 10x2.5" brakes that came with it. The 6 cyl.eng./trans was already gone, .850" T-bars..I let them go...
-
