Quick question and hopefully quick answer....are the rear calpers on a 74 the same with the exception of which ports are used for bleeders and fluid line? Ordered 2 new ones from MAM a left and a right. the 2 I received have a LH stamped in them and the same casting numbers on them. The 2 old ones have casting numbers with  different last numbers. Called MAM and they said didn't know and would check into it. Didn't get a call back the rest of the day. Would like to get them on this weekend if the only difference is the bleeder and line locations. danascar2011-04-29 18:11:38

The bleeders on the calipers have to be at the top when the caliper is mounted. I dont have mine here at the house but I would think if they have the same numbers they would have to be the same side. I dont think you got both sides but as you suspected you probably got 2 of the same side. Not what you wanted to hear if you planned on installing them this weekend. Hope that makes sense.
Rodney

Calipers are made Left & Right...they will only bolt up properly one way. If you put them on the wrong side, the bleeders will be on the bottom instead of the top.
The correct calipers will have the bleeders and the inlet line at the top, and the bolt holes for the spindles to the inside.
Also, the rear calipers have two bleeders at the top, instead of the one bleeder for the front calipers.
btw..the holes for the bleeders are different than the holes for the line...the bleeder holes have a tapered seat in them, where the inlet line hole will have an inverted seat for the flared brake line...you cannot mix/match these fittings. Well...you can, but it will leak like a sieve, and it will ruin the seats for both.

Sounds like they failed on two points..wrong part and no return call!! Rebuild the ones you got and send back the stuff..you can always buzz down to Carlisle tomorrow and pick some up..bunch of guys have them there!! (click here to see one of the better ones!)

Rich 
Norsky2011-05-01 13:07:43

Really confused now! Just did a test fit and both bleeders are on top on both sides and the inlet ports are where they should be. They bolt up okay, all holes line up. Is it possible, although not likely, that they are stamped and have the wrong casting numbers on them?

Do they match up to your old calipers? If the calipers will bolt to your brackets correctly and the bleeders are on the top and match the calipers you are replacing, I wouldnt get concern with the part number stamping. After your last post description it sounds as tho you will be ok. Hopefully your bleeding of the brakes goes well.
Best of Luck
Rodney

You have the correct set of calipers...just ignore the casting or stamped info. Rebuilt stuff doesn't always follow proper protocol for numbers. If they bolted up, and the lines/bleeders are up in the righ position, yer good to go.

Well, that's good news / bad news. Good that I can use them, hopefully, bad news that I ordered and paid for brand new calipers! $ 160 each  from MAM....first time ordering from them and most likely last time!!    Wonder who I can talk to when we're out there????

Like I said ...boxem up and send them back..rebuild is only 30$!!

Rich

Go to the head of the class and talk to Mike Yager!!  He is the Chief Cheerleader and CEO/COO of Mid America.  One of the nicest guys you wanna meet!!  Look me up at the Hotel and I will put you under my wing!!!  (Now what is EBO gonna say about that>>)