Piecing together disk brake parts.

[Bronze Barracuda]

Ok i thought I was trying to piece together a 10.95 inch small bolt pattern brake setup. But I think I made a wrong turn.
I do not want 4 piston calipers.
I have 73 upper control arms.
Whatever I can buy from Rockauto I will.
So I obviously need spindles, caliper brackets, and dust shield, from either Dr. Diff or privately.
But it seems the only way I can go with the small bolt pattern is to use the 4 piston setup? Which doesn't work with the 73 & up upper control arms. (I think). Also it looks like the rotor assembly is different with the SBP. The hub is seperate from the rotor. So I need to go with the 11.75 in rotor hub assembly which is big bolt pattern. Which means I would need wheels with the big bolt pattern. Or is it possible to buy a hub rotor assembly that fits into the 73 and up spindles. I know I am probably missing some info. Also will be running a sway bar in the future. Car is a 68 barracuda.

 

[72bluNblu]

Ok i thought I was trying to piece together a 10.95 inch small bolt pattern brake setup. But I think I made a wrong turn.
I do not want 4 piston calipers.
I have 73 upper control arms.
Whatever I can buy from Rockauto I will.
So I obviously need spindles, caliper brackets, and dust shield, from either Dr. Diff or privately.
But it seems the only way I can go with the small bolt pattern is to use the 4 piston setup? Which doesn't work with the 73 & up upper control arms. (I think). Also it looks like the rotor assembly is different with the SBP. The hub is seperate from the rotor. So I need to go with the 11.75 in rotor hub assembly which is big bolt pattern. Which means I would need wheels with the big bolt pattern. Or is it possible to buy a hub rotor assembly that fits into the 73 and up spindles. I know I am probably missing some info. Also will be running a sway bar in the future. Car is a 68 barracuda.

The only factory 5x4" disk set up used the 4 piston calipers and small ball joint UCA's (67-72).

If you already have the large ball joint control arms (73+), then your only truly factory option for SBP would be the 73+ 10" drums, which were 5x4".

But, DoctorDiff does sell the converted 73+ rotors that have the SBP instead of the BBP. Basically, it's the normal 73+ disks that would have been 5x4.5" but with the rotor re-drilled for 5x4".

The issue that comes up with the 5x4" conversion rotors is that the hub register is larger than the original SBP hubs. Which means that factory small bolt pattern wheels will not usually fit with the converted later rotors, even if the bolt pattern matches because the hub bore of the original SBP wheels is too small. The same is tru for the dual bolt pattern Wilwood kit, that one has an even larger hub register (3.06") so NONE of the factory wheels fit, early, late or even reproduction. The wilwood kit is aftermarket wheels only now.

Call DoctorDiff, he can explain the options on what he carries. But I know he's mentioned that he can replicate the MBM kit, which is the 73+ disks with the 5x4" pattern added.

 

[Bronze Barracuda]

The only factory 5x4" disk set up used the 4 piston calipers and small ball joint UCA's (67-72).

If you already have the large ball joint control arms (73+), then your only truly factory option for SBP would be the 73+ 10" drums, which were 5x4".

But, DoctorDiff does sell the converted 73+ rotors that have the SBP instead of the BBP. Basically, it's the normal 73+ disks that would have been 5x4.5" but with the rotor re-drilled for 5x4".

The issue that comes up with the 5x4" conversion rotors is that the hub register is larger than the original SBP hubs. Which means that factory small bolt pattern wheels will not usually fit with the converted later rotors, even if the bolt pattern matches because the hub bore of the original SBP wheels is too small. The same is tru for the dual bolt pattern Wilwood kit, that one has an even larger hub register (3.06") so NONE of the factory wheels fit, early, late or even reproduction. The wilwood kit is aftermarket wheels only now.

Call DoctorDiff, he can explain the options on what he carries. But I know he's mentioned that he can replicate the MBM kit, which is the 73+ disks with the 5x4" pattern added.

Yeah, I guess what I was/am trying to accomplish is a set up that allows me to order wear parts from Rockauto, Jegs, O'Riley's etc. I don't mind the 14 inch wheels. Maybe I'll run BBP up front and keep SBP in the back. Guess I'll have to carry 2 spares

 

[72bluNblu]

Yeah, I guess what I was/am trying to accomplish is a set up that allows me to order wear parts from Rockauto, Jegs, O'Riley's etc. I don't mind the 14 inch wheels. Maybe I'll run BBP up front and keep SBP in the back. Guess I'll have to carry 2 spares

Yeah, that would be hard to do with the original Kelsey Hayes SBP disks. At the moment most of those parts are available like that, but that hasn't always been true and more than likely it won't be the case going forward. The 73+ disks and BBP stuff is available like that, and you already have the most expensive part to do that, the 73+ large ball joint UCA's.

But even if you ordered the 73+ rotors from Doctor Diff with the 5x4" bolt pattern installed you would be able to order all the wearing parts other than the rotors themselves from your regular parts sources. And a set of rotors should last you close to 100k miles with normal use. Driving my '72 Challenger daily I put 70k miles on it, I swapped the pads out at around 50k miles but the rotors were fine for another go, and that was hauling in 275/40/17 front tires the whole time.

 

[Bronze Barracuda]

Yeah, that would be hard to do with the original Kelsey Hayes SBP disks. At the moment most of those parts are available like that, but that hasn't always been true and more than likely it won't be the case going forward. The 73+ disks and BBP stuff is available like that, and you already have the most expensive part to do that, the 73+ large ball joint UCA's.

But even if you ordered the 73+ rotors from Doctor Diff with the 5x4" bolt pattern installed you would be able to order all the wearing parts other than the rotors themselves from your regular parts sources. And a set of rotors should last you close to 100k miles with normal use. Driving my '72 Challenger daily I put 70k miles on it, I swapped the pads out at around 50k miles but the rotors were fine for another go, and that was hauling in 275/40/17 front tires the whole time.

Love it. That's what they were built for.
Too drive
I plan on doing a lot of driving for many many years. I live in Vancouver and I have already talked to my dad about a father son trip, 3 weeks, Route 66 as much of the old hiway as possible, from Chicago to San Diego. ( I think that's where it goes) stopping at all the tourist traps and other cool stuff. So that drive alone, whew. Vancouver-Chicago-San Diego-&Back to Vancouver!!

 

[72bluNblu]

Love it. That's what they were built for.
Too drive
I plan on doing a lot of driving for many many years. I live in Vancouver and I have already talked to my dad about a father son trip, 3 weeks, Route 66 as much of the old hiway as possible, from Chicago to San Diego. ( I think that's where it goes) stopping at all the tourist traps and other cool stuff. So that drive alone, whew. Vancouver-Chicago-San Diego-&Back to Vancouver!!

That’s awesome!

Yes, they’re meant to be driven. I finally pulled my Challenger off the road to fix some pretty extensive rust, but I still daily drive my Duster which replaced it in my driving rotation.

Also, something to consider for your brakes is that even if you bought the converted 73+ rotors with the SBP this time, you could always replace those with regular old 73+ rotors when you’re ready to go BBP.