? RE: identifying disc brakes

[CarFreakGT]

What's the best way to figure out what the front discs on my 68 came off of? A search didn't yield much--mostly conversion threads. Is it basically visual inspection and comparison, or will there be a part # stamped somewhere? If so, where can I look for a part #? Sorry to be asking and not just looking myself, but it's gotten dark out, and I won't be able to look until tomorrow after work. Just wanted to get an idea where to look when I'm out there. The rotors are ~10" and the bolt pattern is 5 x 4.25" in case that rings a bell for anyone. Thanks in advance for any feedback!
Bryan

 

[D.Hearne]

Rotors are more likely 10.5 and the bolt pattern is 5 x 4.5. Aside from the 67's dual piston calipers, the later 68-up discs are all the same if I ain't mistaken, that goes for the Granada, Monarch, 71-73 Stang, and Maverick/Comets. These are all single piston calipers.

 

[D.Hearne]

Rotors are more likely 10.5 and the bolt pattern is 5 x 4.5. Aside from the 67's dual piston calipers, the later 68-up discs are all the same if I ain't mistaken, that goes for the Granada, Monarch, 71-73 Stang, and Maverick/Comets. These are all single piston calipers.

 

[stirling33]

Not to Hi Jack, but I too am wondering what disc's I have on my 67. Can you tell just by looking at them whether or not you have 4 piston or single piston. Pics would be great if anyone had any.

 

[Jester67]

Not to Hi Jack, but I too am wondering what disc's I have on my 67. Can you tell just by looking at them whether or not you have 4 piston or single piston. Pics would be great if anyone had any.

Yes
If you see a tube going form one side of the to the other it is a 4 piston. The K/H 4 piston is the same design as the SSDB conversion kit if that helps.

 

[67GTFB]

and look in some parts catalogs .... some sell reman calipers and you should be able to "see" the OEM 4 piston type .... several catologs are on-line and have decent pics .... the diff between 4-piston and single is very easy to note ....

 

[CarFreakGT]

Rotors are more likely 10.5 and the bolt pattern is 5 x 4.5.

When I measure for bolt pattern, don't I measure from stud center to stud center? That's what I did and it is exactly 4.25". I'm just a little confused, I guess?

 

[Spoofty]

If you had a pefect circle drawn from stud to stud. The diameter of that circle is the bolt pattern measurement. On a 5 lug stud to stud is not the diameter. If you measure form the center of one to the outer edge of the other it will be just about right.
http://www.summitracing.com/streetandstrip/charts_guides/boltcircle2cxcropped.htm

 

[LMan]

Rotors are more likely 10.5 and the bolt pattern is 5 x 4.5. Aside from the 67's dual piston calipers, the later 68-up discs are all the same if I ain't mistaken, that goes for the Granada, Monarch, 71-73 Stang, and Maverick/Comets. These are all single piston calipers.

correct

 

[CarFreakGT]

THANK YOU! THANK YOU! THANK YOU!

Thanks for the clarification! That has been driving me nuts! Spoofty, I have seen that diagram before--I guess I just remembered the points to measure wrong. Thanks for the link. I have been checking out pics online and it does appear that I have the single piston calipers.

Thanks again!

 

[67GTFB]

Vintage Wheel Works has a good graphic of how to do this measurement .... follows above suggested way .... see -- http://www.vintagewheelworks.com/tech-bolt-pattern.php ....

 

[CarFreakGT]

Vintage Wheel Works has a good graphic of how to do this measurement .... follows above suggested way .... see -- http://www.vintagewheelworks.com/tech-bolt-pattern.php ....

AHA...Maybe that's how I got confused. For a four-bolt you do measure center-to-center. Thanks, GTFB

 

[D.Hearne]

I always measure from the center of one stud to an imaginary line drawn between the two opposite studs. Not too many cars have a 4.25" bolt circle, all Fords were either 4.5" or 5". Chevy's and GM's had 4.75" or 5"