disc brake knuckle measurements

[TheLimeRanger]

anyone have a disk brake knuckle laying around that would be willing to provide some measurements? trying to have some shims made to fit. need to know the outside diameter and inside diameter of the mating surface as well as the distance between studs.

thx!

 

[Apogee]

I don't have a '76-'77 EB disc brake spindle handy at the moment (it's still under my EB), but I do have a '76 F150 disc brake spindle (same stud pattern as the 76-77) sitting in a pile of parts at the moment from my full-width swap if those dimensions would work.

 

[TheLimeRanger]

That would work !

 

[Apogee]

So based on measurements with my digital calipers, I get the following:

Bolt Circle = Ø5.250"
Angular Spacing (lower 3 studs) = 68*
Angular Spacing (middle studs) = 70*
Angular Spacing (top 2 studs) = 84*

Inside Dia = Ø4.089"
Outside Dia = Ø6.375

Stud Hole Dia = Ø.437 +/-.001

There are some geometry reliefs into the OD around the two studs opposite the steering arm for the brake calipers which are too complex to measure easily with calipers, let alone describe with words, so how accurate do you want this to be? I could send you a drawing/model if you like, just let me know what file format you prefer.

Tobin

 

[TheLimeRanger]

outstanding thank you! a drawing would be amazing!

 

[PNWBroncos]

It's for me, looking to print the shims in cabon fiber filled polycarbonate. I'll draw up these dims and see if I got it right. Unless you already have it drawn or modeled already. I've got solidworks 2014. Can import most types.

 

[Apogee]

Solid STP file heading your way Jesse. FWIW, there's a .08" x 45* chamfer on the spindle bore hole that you'll want to account for in your shim design, as it looks like it's there to accommodate the fillet radius on the spindle itself.