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Correct brake rotor needed?

Dominic

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Hi, I was wondering if I could get a recommendation to the correct size front rotors I need for my 68 RR? We are changing the front discs and can't seem to find which size we need on Summit. I attached an image of the wheel well if it's any help. Thanks!

55974771115__032EC591-485D-41C2-BF06-09888FA2BF6F.jpg 55974773200__1BB6E365-10A1-4F22-A0CF-923AA317A9FF.jpg
 
So you are going from drum to disc? If you took off a rotor then measure the old one. Not sure I follow whats going on.
 
I am just replacing the front disc rotors as the old ones are shot. I have a pic of the old one, but I can't seem to find exact measurements online on the listings on Summit. Thanks

08B00EB7-18D7-48B9-9210-D5D9B6A68C80.jpeg
 
If this car is a factory disc brake car, these rotors are the Bendix style for 66-69 B-body. So you need to start searching or Googling for B-body Bendix Rotors. They tend to be expensive. You can get it in a new 1 piece design or just the rotor, that you have to press out the wheel studs to install on original hub.
 
Right, if that is an original disc brake car then good luck. You aren't going to find parts on Summit or your local NAPA. The Bendix four piston setup is collector car only type of parts so you have to search around. You might be able to find a rebuild kit for the calipers but I'm not sure if rotors are available or not. They didn't use to be available but someone might be making them now.

If you are restoring the car then you'll just have to find the stuff. If you are modifying the car then pull all of the Bendix stuff off and sell it and just buy a late model A body disc conversion kit from Doctor Diff. You'll be money ahead and the late model brakes work better and are a ton cheaper to service.
 
Thanks for the responses! It's a big help. So, after measuring I believe they are stock, and are 11.19 inches in diameter/.875 inches thick... I found some on Summit by Bendix that are 11.75 inches and 1 inch thick. Would these be compatible with stock calipers or is that too big? Thanks again.
 
Putting those rotors on earlier b bodies is a very popular swap, but you have to change everything, calipers, knuckles, etc.
 
Ah gotcha. Ok I found one more set of rotors that are SSBC 11.25 inches diameter and .813 inches thick... it seems very close measurements to me.. but would that be too much of a difference as well to work with stock calipers?
Sorry, I'm not familiar with how perfect the measurements have to be to work correctly.
 
Call the ramman in the above video. He can set you in the right direction.
 
Ah gotcha. Ok I found one more set of rotors that are SSBC 11.25 inches diameter and .813 inches thick... it seems very close measurements to me.. but would that be too much of a difference as well to work with stock calipers?
Sorry, I'm not familiar with how perfect the measurements have to be to work correctly.

It isn't that easy. The rotor spins a set of tapered roller bearings and there is a seal that keeps the grease inside the hub. There is also the bolt pattern and the location of the hub face which locates the wheel on the car. You don't seem to understand how important a front hub assembly is to your car. All of those measurements have to be correct for a replacement hub/rotor to work. You can't just randomly select some parts out of a catalog and expect them to work. You are dealing with some stuff that barely exists anymore. I tried to rebuild a set of Bendix disc brakes 30 years ago and it took me a ton of time back then to find a replacement set of rotors.

You'll need to be very careful with your search since you'll find a lot of various Bendix rotors for sale. What you need are very specific rotors and/or a rotor + hub combination. Try something like this: https://www.ebay.com/itm/Rotor-Disc-for-1966-1969-MoPar-B-Body-with-Disc-Brakes-/321081209600
 
It isn't that easy. The rotor spins a set of tapered roller bearings and there is a seal that keeps the grease inside the hub. There is also the bolt pattern and the location of the hub face which locates the wheel on the car. You don't seem to understand how important a front hub assembly is to your car. All of those measurements have to be correct for a replacement hub/rotor to work. You can't just randomly select some parts out of a catalog and expect them to work. You are dealing with some stuff that barely exists anymore. I tried to rebuild a set of Bendix disc brakes 30 years ago and it took me a ton of time back then to find a replacement set of rotors.

You'll need to be very careful with your search since you'll find a lot of various Bendix rotors for sale. What you need are very specific rotors and/or a rotor + hub combination. Try something like this: https://www.ebay.com/itm/Rotor-Disc-for-1966-1969-MoPar-B-Body-with-Disc-Brakes-/321081209600

Thanks for the lead. Yes, exactly!- I really don't want to select a random part that won't work, that's why I'm asking you guys for help.
I also found this set on Yearone that claims to work with Bendix 1966-69 4 piston calipers.
https://www.yearone.com/Product/chrysler-b-body/bn144

It says it's a one piece design, and quite cheaper than the Ebay listing. Think this is a good deal and match?
 
That appears to be a one-piece replacement for the original two piece design. If so, that is a good idea and you are lucky that someone has tooled up a replacement part and isn't charging a fortune for them.

I've never seen that one before so I have no idea how good of a job the guy in China did when he made the mold. You'll probably need to order a pair to find out if they are any good. Be very careful about inspecting them. Check both tapered bearings for fit as well as the grease seal and the cup on the front. You might need to get them turned even though they are new since sometimes the Chinese aren't so good about details.
 
Sounds good. I will order a pair and get them checked out !
I'll update how they are. Thanks for the help, I appreciate it.
 
There is a Rotor only that is available at about $190ea plus shipping, but then you have to remove your old hub and reuse it. The 66-69 B body disc is harder to come by. 70-72 more common, followed by the most common 73 and up.

THe year one add is not really a good one. They say that hub works with Bendix or KH calipers, and that won't work. Bendix calipers mount directly to the spindle. KH calipers mount to a caliper bracket that mounts to the spindle which effects where the rotor is in relation to the caliper.

You could switch to the 70-72 parts easier than coming up with the rotors and doing the rework. If not an OEM graded show car.
 
I have listed here on numerous occasions that I still have some ORIGINAL KELSEY - HAYES Front Brake ROTORS for the 1966 - 1969 "B" Factory Disc Brake
System -- and I also have some N.O.S. ++ Asbestos ++ Brake Pads ----- for the same 4 - piston caliper application....................
 
If I remember from Carlisle, you only have rotors not a complete hub/rotor combination. Is that correct? Also there was no marking of KH on your rotors. Original 66-69 B body were Bendix. Your rotors looked like Dura Brake rotor, which can still be purchased direct I believe. If I am wrong, can you post a picture? I would like to see a KH complete disc assembly for a 66-69.
 
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