68 D88

I have found rotors that I believe will work for '65-'70 (or at least '69-'70) disc brakes for use on '65-'70. The critical dimensions are almost identical to the '69-'70 rotors (within 1/16" in a few places). I was going to mock this up, but never got around to doing it prior to selling my '68 Delta Custom.

The replacement rotors will require precise machining of the hub hole to the larger olds size, and adding the 5 on 5 lug pattern between the existing lug holes (the replacement rotor lug pattern is 4.75 on 5).

The replacement rotor is for a 2000 Camaro. The Napa part number that I have is 4886641. If this works, there are performance versions of this rotor widely available.

If anyone gives this a try, please follow up here as to how it worked out.

joe_padavano

Very nice find. Thanks for the info.

russell7088

NICE will go get some tomorrow and check this out

68 D88

I'm certain these rotors will work, as long as the machining of the hub hole and new 5x5 lug pattern is done precisely. Any decent machine shop should be able to accomplish that part.

russell7088

and who has scored a set of drilled and slotted rotors for free to do this, ths guy lol now gotta find a good, GOOD machine shop

russell7088

will be takng these rotors to machine shop this week

Olds64

That is AWSOME! I hope it works.

Yellowstatue

There are some NOS Delco rotors on eBay right now!

russell7088

post a link to them i cant seem to find any

mpolds

And, of course, if any of you with this car don't wnat to monkey around and risk having a wheel fall off -- I have 4 last N.O.S. Kelsey-Hayes 1969 - '70 OLDS Full Size ROTORS --- have sold 16 of my 20 in the last 2 years now...

No little babies please even bother to ask about them .... you know what you are........

copper128

Just 1 on eBay:
http://www.ebay.com/itm/NOS-1967-196...3e9d6d&vxp=mtr

However I'm unable to confirm that part number. Parts book shows #396454 as 67-68 full size rotor & hub.

russell7088

so funny

sqeeek

Did you ever get that to work? I've got a C body with the worst front end you'll ever see... as my daily driver. Trying to find a way to get some normal rotors on this thing.

mpolds

I have 2 last N.O.S. ++ DELCO ++ Front HUB & ROTORS Assemblies for the 1967 - 1968 OLDS FULL SIZE application....
and 4 last N.O.S. Front ROTORS for the 1969 - 1970 OLDS FULL SIZE applications...........

Best to call me -- Craig -- 516 - 485 - 1935..... New York.
Will deliver by UPS to 49 states (not Kentucky)...

joe_padavano

We appreciate the fact that you have these parts for sale, but it would be more appropriate to put this in the Classifieds forum for items for sale, rather that posting this same post in every single thread about full size brake rotors.

68 D88

Has someone ran with the idea? These look very similar. May be a different brand of aftermarket rotor for the same application with the prescribed machine work.

Good job to whoever did it.

http://www.ebay.com/itm/69-70-Oldsmo...fd74e3&vxp=mtr

russell7088

I would assume some one took it and ran with it!!!

68 d88 I have a 69 delta 2 door hardtop for sale!!

matchek

68D88, I looked at this NAPA part. Please clarify in your post, we are to buy these rotors and then have a machine shop the hub diameter is drilled to spec and also ensure the 5 lug - holes are drilled? Aren't the lug holes already drilled when you get it?

As far as the hub hole, I think it just needed to be enlarged if I am reading correctly. When I read your post, it sound like these rotors come with no lug holes. My apologies that I not getting exactly how this part needs to be modified

Thank you for posting this find.

matchek

I think I get. The rotor on NAPA has 5 holes, but it won't fit the 68 Olds.

The one on eBay will fit the 68 Olds. (I think)

Has anyone tried to fit the ebay item her on a 68 Olds - full size to see if it worked with no modification?

joe_padavano

The ebay rotors are apparently from some other, currently available, application that the seller claims to have machined to be compatible with the 69-70 full size cars. This shouldn't be difficult to do, so these may be a very nice solution.

The one possible issue for using these on the 1967-68 cars is the fact that 69-70 cars use sliding calipers that can accommodate variations in the "offset" of the rotor friction face from the mounting surface. If these adapted rotors have a slightly different offset from the originals, there's probably enough sliding accommodation in the caliper mounts to accept it.

The 67-68 cars came from the factory with the fixed four-piston calipers. Any rotors used for those applications MUST match the dimensions of the original rotors EXACTLY, otherwise you'll have problems with getting the calipers to fit and work properly. Of course, if one is converting a 67-68 car to use the 69-up sliding calipers, this would not be an issue. This conversion does require changing the caliper mounting bracket, however.

matchek

Thank you very much Joe. So for clarification, the 69 rotor is not identical to the 68 rotor dimensions? Or we don't know for sure?

And if the "offset " is off? What did you mean by that? I am thinking diameter, thickness, etc.

I am aware of the difference of calipers so it would make sense if the rotors were different. I would not doubt that the ebay ones would not be a perfect fit for the 68.

joe_padavano

I don't know for sure. I do know that on the A-body cars, the two-piece rotors for the 67-68 cars are just slightly different from the single piece rotors on the later cars. You can use an early rotor on a late car since the caliper slides, but not necessarily use a late rotor on an early car. The fact that the ebay rotors are adapted from some other application makes it even more uncertain. I'm not saying they won't work, just that I don't know.

matchek

Thank you very much Joe for the offset explanation.


Please take a look at this:
http://www.lategreatchevy.com/full-s...1967-1968.html


This is for a 4-piston caliper Chevy. Any chance this would work for 68 Olds 88? I know it was said before it would not, but this looks like a new part. Works for Chevy full size 4 piston caliper.

68 D88

Good discussion on this. My proposed solution was to use 69-70 disk brake assemblies, and substitute the 2000 Camaro rotor with some machining. I am confident it will work with the sliding calipers.

BTW, if anyone is interested:

https://classicoldsmobile.com/forums...sc-brakes.html

joe_padavano

That vintage Impala used the smaller, A-body sized brakes and 5 x 4.75" wheel bolt circle. The Impala also used the smaller A-body wheel bearings (A2 and A6) instead of the larger B-body bearings (A3 and A5). Essentially the Chevy B-body cars used the A-body brakes, just like the Jetstar 88s. That's why you can buy rotors for the Impala, because they are A-body repro parts and EVERYBODY sells A-body parts.

This is why it was said before that they won't work, and they STILL don't. Once again, NO ONE makes repro or replacement rotors for the 1967-70 B-body cars. The ebay adapted rotors are interesting but are not 100% factory replacements. They are the best available today.

Octania

"the replacement rotor lug pattern is 4.75 on 5"

Huh, four and three quarters holes on a 5" circle?

:-)

joe_padavano

It's a REALLY rare option.

Hey, Ferd built trucks with SEVEN lug wheels.

(And just so we're all clear, that's SUPPOSED to be 5 x 4.75")

matchek

Thank you for the 2000 Camaro rotor option! Always nice to know there are options.

I am following up on my Caddy Fleetwood rotor option. Attached are some specs for rotors for the 1968 Fleetwood rotors (that can be purchased from RA for $125) and what is in the service manual for the 1968 Delmont 88 rotor size.
From what I see, the camparable size looks so close. Outside diameter difference is less than 1/16"! Thickness is square on!

But if I don't if other dimensions match, like the hub.

65JS1

Yes the Camaro rotors work just fine (NAPA p/n 4886641). Just got done installing them on my 65 Jetstar I project. The brakes assemblies are off a 70' 98. The hub hole needs to be machined larger and re drilled for the 5 on 5 bolt pattern. The machining cost me $150 where I got it done.

68 D88

Thank you for the follow up. If you have an opportunity, please post up some pics of the finished product. Thanks.

65JS1

image.jpg

65JS1

image.jpg

68 D88

That looks very good and is exciting. I certainly appreciate you doing this. Please let us see the whole car when the right time comes.

65JS1

Hey, thank you for coming up with the idea. I do have a thread with my progress on the Jetstar so far. It's in the in the repair & restoration section.

rcdynamic88

This is some very much appreciated information. I put the disc brake spindles from a 70 Olds 98 Convertible on a 61 88 Bubble-Top a long time ago (1994). I had difficulty finding usable rotors even back in the 90's. The ones on the donor car were too far gone. I believe a wrecking yard in Arizona had set way back then, and shipped them to the yard near me. I am currently trying to re-aquire that same 61 and was concerned about the front brakes. This looks like a relatively easy job for any machine shop.

copper128

That Cadillac rotor shows as no longer available from RockAuto, but I did some checking and found they use the same inner and outer wheel bearings as the 68 Olds. That is a very good sign, but not absolute proof that they are an interchange. Did you ever try one, matchek?

NAPA still sells them under part number NB 4885515, showing at $104 each.
http://www.napaonline.com/Catalog/Ca...515_0380335333

joe_padavano

Here's the Centric drawing and part number for the Fleetwood rotor. Nice find. The big issue will be offset, but I would be amazed if the front spindle on the Caddy were different than those on the Olds.

mpolds

Or --- just grab my LAST two (2) 1969 - 1970 Original Kelsey-Hayes ROTORS.....


And, I still have the two (2) 1967 - 1968 OLDS FULL SIZE HUB & ROTORS in the
original Baby Blue KELSEY - HAYES boxes !!!!!!!!!


No "Monkeying" around required........... (AMERICAN STEEL, also........)

joe_padavano

Which unfortunately doesn't fix the problem for the SECOND guy who needs them...

mpolds

Well, the second guy can be the first guy -- because I still have two (2) and the
"first" guy who PM'ed me never called....
SO... there can still be one (1) lucky winner!!!!!!!!!!!!!!!!!!!!!!!!