70 Challenger brake caliper problems

[Wags70ss]

Hey! New guy here. I have a 1970 Dodge challenger RT that I am currently working on. The front brake calipers were both seized up after sitting for 42 years. I have ordered 2 different sets of calipers and they won't fit on the car. The first set I got from orielly and I had to hammer the caliper on the bracket. Then I couldn't get the bolts to line up. So I ordered a set of remanufactured ones off ebay. Same thing. I got to looking at the new VS the old ones, and the thickness of the tab where the bolt goes through is different. The tab won't go down far enough to allow the bolt to line up. Did they make different types of calipers for the 70 Challenger? Also the brake pad on the outboard side won't fit onto to caliper. I have to hammer it on. Anyone else seen this problem? I ordered a 3rd set from NAPA. They are rebuilt so I hope they fit. They are supposed to be remans. Thanks for any advice!

 

[Rapidfire]

I rebuilt the stock ones on my 70 and ordered them from Napa and they fit perfect. Not sure why the others are not right? Also, welcome to the forum. You might want to go the the Welcome wagon and introduce yourself and we would like to see that Challenger you are putting brakes on.

 

[Challenger RTA]

SOOOO, you need a bigger hammer?

 

[Challenger RTA]

Are they pin type caliper? meaning bolts with pins on the end.

 

[Wags70ss]

Are they pin type caliper? meaning bolts with pins on the end.

Yes that's correct. In the picture you can see the difference in the width of the section where the pin/bolt goes

 

[Wags70ss]

I rebuilt the stock ones on my 70 and ordered them from Napa and they fit perfect. Not sure why the others are not right? Also, welcome to the forum. You might want to go the the Welcome wagon and introduce yourself and we would like to see that Challenger you are putting brakes on.

Go to my YouTube channel Wags Automotive and you can see it rolling out of the pig barn after 40 years almost to the day!

 

[Challenger RTA]

Measure the rotor see what size it is.I There is or was a bigger set up.Up grade as to say. cop rotor. don't know if this is your problem or pistons not in the whole way. or miss matched parts. stock size

Outside Diameter (IN)

10.980

 

[Challenger RTA]

Bolt Circle Diameter (IN)	4.500
Bolt Circle Diameter (MM)	114.300
Bolt Thread Pitch (IN)	20.000
Disc Mounting	Hub & Rotor
Discard Thickness (IN)	0.940
Discard Thickness (MM)	23.880
Misc Holes	0
Nominal Thickness (IN)	1.000
Nominal Thickness (MM)	25.400
Outside Diameter (IN)	10.980
Outside Diameter (MM)	278.900
Overall Height (IN)	4.839
Overall Height (MM)	122.900
Solid Or Vented Type Rotor	Vented
Stud Thread Diameter (IN)	0.500
Surface Type	Smooth
Vane Style	Straight

 

[Challenger RTA]

Hold onto your original parts until you know what you got.

 

[Wags70ss]

Hold onto your original parts until you know what you got.

Ya I always do that. Problem is that I can't get the pistons out of them. I even put heat on them with my torch and they won't break loose.

 

[Challenger RTA]

Check to see of there is piston (Resin or metal?) for sale.destroy the piston and replace. spray with KROIL ,loosey-goosey,Pb blast,there are some others. let it set A week? Then try heat and air. used a number of times.watch it doesn't kill you! Being that tight the caliper might be to far gone.you don't know until it's apart.Remember the back side of caliper not as critical as the side.

 

[Wags70ss]

I ordered remans from NAPA. I'll see what they look when I get them.

 

[Wags70ss]

Measure the rotor see what size it is.I There is or was a bigger set up.Up grade as to say. cop rotor. don't know if this is your problem or pistons not in the whole way. or miss matched parts. stock size

Outside Diameter (IN)

10.980

I have 11 inch rotors?

 

[Challenger RTA]

I have 11 inch rotors?

That's stock.

 

[Wags70ss]

Here she is, running after 42 years! Now if I can just get the damn brakes fixed!

 

[Challenger RTA]

Here she is, running after 42 years! Now if I can just get the damn brakes fixed!

Did you look for the broadcast sheet?

 

[Wags70ss]

Did you look for the broadcast sheet?

Haven't touched the interior yet. The guy I bought it from had the seats reupholstered right before he parked it. And, unfortunately the one bad thing about it sitting in a pig barn for 40 years is that there was an entire mouse condominium inside the car, so I'll be surprised if I find it.

 

[Wags70ss]

wagsautomotive on TikTok

 

[ted s]

bet the brakes arent stock 1970 patrs

 

[Wags70ss]

bet the brakes arent stock 1970 patrs

The car only has 66,000 miles on it. I'm pretty sure they are OEM.