Rear disk options Exp v. Vic v. Mark

Gailahan said:

That's what I meant by flip-flopped. One caliper is in front of the axle and the other is behind. If you look at the backing plate you are actually "flipping" it over from one side to the other.

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ok, i understand now. it just seemed like you had done something different with them

Rusty67 said:

bnickel, I've never seen a Porsche pulling a boat but all the rear brakes I've looked at up close on Porsches' have an internal drum parking brake ;-)

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hmmm, well i don't know then. all of the c3 vettes had internal drum parking brakes as well but those may have been designed before the advent of the integral parking barking brake calipers. i'm not sure if the porsche design is because of that either or something else. were these new porsches you've been looking at or older ones?

Rusty67 said:

Helmantel, what I mean by two seperate fiction surfaces is that there is a drum inside the rotor and the rotor itself. I know there are pads on both sides of the rotor. Inside the hat of the CV rotors are a smaller drum with seperate brake shoes which act as the parking brake and if the calipers fail (not likely but it COULD happen) then you still have your parking brake AND a seperate set of friction material.

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Ah, I see what you mean. I knew that the CV had separate parking drums, which is a good idea, because drum brakes are more suitable for a parking brake than discs.

In one of my Mustang books, there is an interesting interview with one of the engineers of the SVO mustang, who explained that they had problems getting the parking brake to work properly. When a disc brake is hot (after stopping the car) and you pull the hand brake, the clamping force will reduce when the rotor cools (becomes thinner). A drum brake doesn't have this problem, because when it cools, the drum diameter becomes smaller and increases the clamping force. The SVO engineer mentioned that one of the mandatory tests was to make a few panic stops, park the car on a hill with a certain slope angle and pull the parking brake so that it would just hold the car. The brakes were then allowed to cool down for 30 minutes and the car was not supposed to move.

On the other hand, there are many cars out there that successfully use the disc brake as a parking brake. How well the SN95 brakes work, I don't know. Ultrastang seems to have no problems with the parking brake function of his.

As much as a parking brake is very important, what will actually stop better though. Are the cobra rears on a classic really good? How do they compair to the exploder... I mean... if it can help stop a truck... Doesn't Currie use the explorer disks in their kit?
Kevin

Decurion said:

I understand what clocking means, and that from the factory one caliper is in front, one behind the axle, it just sounded like some people were rotating one so that both were in front or both behind the axle. Also sounds like I can scratch the Mark VII brakes, since the mounting brackets alone will cost about triple that of the entire brake assembly!
That does it for me! Crown Vic brakes it is! Hopefully Ive answered some questions for others that may be considering the 4 wheel disk swap too. The only other thing I can think of is pretty minor, but: how important is the dust shield?



No, I missed that! Ill have to check it out! I tried a quick look at the website, but didnt see it. Ill just go pick up the magazine.

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In that case, you'll need some axle spacers and some rotor centering rings. Here's a link to some photos I posted a while back (here) on the Crown Vic rear discs:
http://forums.stangnet.com/showthread.php?t=717933&highlight=crown+vic+ultrastang