Cobra brake upgrade questions...

[nkb93]

front brake upgrade (mach1 calipers?)

First, can anyone confirm that the Mach1 front calipers are mechanically identical to the Cobra calipers? The Mach1 pieces are a little cheaper and I don't want the "cobra" badging anyway.

Here's a pic:

http://www.stangstore.com/Merchant3...e=S&Product_Code=M2320MH1&Category_Code=MACH1

I'm going to use 16" wheels and 11.6" rotors, so the caliper brackets will be modded accordingly. I assume 13" brake pads are still used, though. In this case, do the 13" brake pads wear strangely since their outer radius doesn't match up with the outer radius of the 11.6" rotor?


Nathan

 

[SHO92]

Yes the Mach 1 uses the same calipers. Pads are made to work with calipers, not rotors, so yes, you will still use the 13" pads.

I can't comment on the wear issue, but I have not heard of anyone having problems.

 

[wood_e]

The bracket mounting holes need to be moved up from their current position .7" and tapped, then the bracket needs to be milled flush to the new olhe. Pretty simple, I did it in my garage.

The pads don't wear any differently, in fact it doesn't use part of the rotor, but its far inward on the radius so it doesn't matter. My rotors warped under heavy conditions but mine are solid. I would get some power slot rotors. I know I will be.

 

[shomesomesho]

The bracket mounting holes need to be moved up from their current position .7" and tapped, then the bracket needs to be milled flush to the new olhe. Pretty simple, I did it in my garage.

I am planning on doing this real soon.

The .7" . . . is that center-to-center or edge-to-edge of the bracket holes?

Do you recall offhand what size thread is the tap?

Which side of the bracket needs to be milled flush, the side that contacts the spindle, or the other side?

Any chance you have a picture?

 

[DHMag]

I am planning on doing this real soon.

The .7" . . . is that center-to-center or edge-to-edge of the bracket holes?

Do you recall offhand what size thread is the tap?

Which side of the bracket needs to be milled flush, the side that contacts the spindle, or the other side?

Any chance you have a picture?

.7" center-to-center. (.375" if you turn 13" rotors down to 12.2"[the largest rotor that will fit under slicers, albiet a very tight fit]).

off the top of my head, tap is like a M12x .75 but dont quote me on that.

the spindle side.

 

[shomesomesho]

Cool, thanks Dale.

 

[DHMag]

i modified the brackets in my garage. it is very simple and doesnt take very long. centerpunch, drill, tap, cut off the mounting boss.

 

[shomesomesho]

ok I think I figured it out . . . something like this basically,

(13" - 11.6") / 2 = 0.7"

 

[nkb93]

pics?

I understand the concept of moving the M12 threaded holes in the caliper bracket by 0.7", but it seems like this would put the new M12 hole too close to the old one, and you'd risk the bracket breaking between the two holes.

How is it possible to drill a new hole offset by only 0.4" for the 12.2" rotors? It would seem like that would require ~0.5" diameter holes to be overlapped. I know it's been done before, I guess I'm just not seeing this correctly.

Does anyone have pics of the required bracket mod for <13" rotors?

Dale, you mentioned the tools you used. How did you get by without a milling machine to flatten off the surfaces on the caliper bracket that mate with the spindle?

 

[SHOblime]

I am also planning to do this very soon...I would love a picture of what this new hole should look like when done...I think if I had the bracket in my hand it would make more sense. I plan on buying the '94/95 spindles very soon and picking up some new calipers....

 

[wood_e]

pic:

 

[DHMag]

Dale, you mentioned the tools you used. How did you get by without a milling machine to flatten off the surfaces on the caliper bracket that mate with the spindle?

with very crafty skills and a good eye

 

[3.8Lwagon]

will this work with gen 4s? i realy haven't gone and explored the spindel differences between my 94 and 00
do you have to use mustang rotors? or will 96+ sho or 2001 slo rotors work?

is it possable to get a side shot of the calipers

 

[wood_e]

11.6 inch rotors work if you modify the bracket as indicated above. It should work on Gen 3s and 4s too...

My set up:

 

[SHOblime]

What exactly needs to be machined down?

 

[wood_e]

In the pic of the brackets, you see how the left one poltrudes? The right one is milled down flush with the rest of the bracket.

Also, if you do this, get cross drilled or sloted (or both) rotors. I think I actually was able to warp my solid rotors.

 

[nkb93]

Thanks for the pics, those help a bunch.

I know that the Mustang calipers must be swapped Left and Right to allow the bleeder to be in the proper orientation, but what about the brackets? I assume the brackets go on the correct side (no swapping) since they're probably designed to take force primarily in the forward direction.

For aggressive street and maybe some light track duty, will I see any difference with the PBR calipers over the standard 96+ SHO calipers? I like the fact that the PBRs look better and are lighter (right?), but do they actually perform any better with the 11.6" rotors? Is pedal feel improved?

 

[shomesomesho]

pic:

When you mill off material from the caliper bracket (to make it flush), does that not change the offset of the bracket relative to the rotor leading to interference between bracket & rotor? Or do you use spacers to correct it?

 

[wood_e]

When you mill off material from the caliper bracket (to make it flush), does that not change the offset of the bracket relative to the rotor leading to interference between bracket & rotor? Or do you use spacers to correct it?

If you don't mill off that part, the bracket touches the rotor back, I learned the hard way.

 

[wood_e]

Thanks for the pics, those help a bunch.

I know that the Mustang calipers must be swapped Left and Right to allow the bleeder to be in the proper orientation, but what about the brackets? I assume the brackets go on the correct side (no swapping) since they're probably designed to take force primarily in the forward direction.

For aggressive street and maybe some light track duty, will I see any difference with the PBR calipers over the standard 96+ SHO calipers? I like the fact that the PBRs look better and are lighter (right?), but do they actually perform any better with the 11.6" rotors? Is pedal feel improved?

The brackets are the same I believe. I had the 96 upgrade on and I wouldn't give up my PBRs over the 96 upgrade any day. There's a big difference in stopping power and pedal feel. The PBRs are quite a bit lighter too.