allyolds68

I'm sure the rotors are too thin to be turned but the hubs are good. Probably not worth shipping but I will. I know I've got the other one around somewhere. $20 + shipping for both

Yellowstatue

If there was a source for replacement discs I would be well stocked!

orange442

Those were actually used up to 1970. My Dad and I have and have had several 70 model A bodies with these still on them.

Octania

Mucho Interesante!

What's them other threaded holes in the hub about?

oldspackrat

Chris,
That is where the rotor is bolted to the hub.

Bernhard

I have never seen a two piece rotor hub on a Olds. All the ones I have seen on Can cars are one piece? Are they common on US built cars?
Are they lighter than the one piece?

oldspackrat

I think the thought was to keep the hub & just replace the rotor. As orange442 stated, they stopped using this version in about '70. I've heard it was just as cheap or cheaper to cast the whole thing vs. the rotor & hub.
My '69 GTO had the 2 piece version also. I guess if you want to be 100% correct your '70 or older car should have the 2 piece set up.

Bernhard

All the 69 442's,cutlass's cars that I have owned and have seen have only had the one piece rotor hub. I used to spend a lot of time in the wrecking yards and have never seen a two piece hub rotor on a olds.
Could this be because the cars were built in Canada
Any idea how the two styles of rotor hub assemblies compare weight wise?

68442

All A bodies 68 -70 Used the two piece rotor. Up until Jan. of 70 then the cars came with one piece rotors. I have to believe 67 with disc was also a two piece.

To take it further camaros/Firebirds of the same era also followed this.

allyolds68

Pretty sure the Vettes used them too

Octania

oh, so the rotor is bolted to the INSIDE of this hub. OK

I admit to not being familiar with this setup- my cars have manual "darn near adequate" DRUM brakes.

I would imagine that the separate parts were hard to make run true enough for disk brakes. Each joint introduces the possibility for runout and out of round. What a headache. Pretty soon they decided it was best to not try to save that tiny hub.

Yellowstatue

A '69 car would have a single piston caliper and use a two piece rotor until the excess stock was used up. My '69 Vista had this setup but my '70 Cutlass (Oshawa built) had single piston caliper and one piece rotor. The one piece rotor can't be used on a four piston caliper. Nowadays you can buy one piece rotors that fit four piston calipers.

Bernhard

Thanks for the reply's and sorry for the hijack.

allyolds68

That's fine it's keep it in top


I'll mic these this weekend and see if there's enough left to turn. It seems like .975 is the minimum required

rr69ho

67442nut

I thought these were only used in '67 and '68 with the 4-piston floating calipers.

67442nut

Mike, The minimum allowed is usually stamped or cast somewhere on the rotor.

Yellowstatue

Four piston calipers don't float, they are anchored solidly. The single piston calipers float.

allyolds68

They're at .955 now

mrolds69

I'm pretty sure the 2 piece deals are repro-ed now. 'Course I'm also pretty sure they are Chinesium. http://www.ebay.com/itm/like/2315416...chn=ps&lpid=82

orange442

Parts Place has them for $129. Just looked under 69 Camaro brake rotor.

https://www.thepartsplaceinc.com/

mrolds69

I'm not surprised, Heartbeat is a mostly re-seller and probably buys them from TPP. A lot of peeps don't know they are available.

mpolds

The two piece rotors were used on all GM "A" body 1967 - 1968 and Nova in 1968 that all used four - piston calipers from the factory...
The thinner hub design allowed for the space required to mount the four-piston caliper...
The brake pad was also VERY different -- and corvette N E V E R used that
set - up... their four - piston set up was unique to just corvettes (and one
other specialized vehicle)....
If the Rotor Plates are too thin -- as you advertise that they are -- you would
still be advised to save the hubs, as there is already discussion that the
plates will one day be reproduced...
Those hubs, then, become more valuable...
If anyone is need of the "D3" 4 - piston caliper BRAKE PADS -- I have plenty of them in N.O.S. ++ Asbestos ++
As indicated, this is NOT a rotor you would want being "ripped to smithereens" with this new friction material.....

allyolds68

Ttt

Octania

Oh I knew they existed. Probably have some still on the parts car. But, I have never DEALT with them in my hands, worked on them, etc.

Bernhard

Do you know how much one rotor and hub weighs?

allyolds68

TtT