Can anyone ID these Jag hubs and say if used on Cobras?

[My427stang]

I got some extra parts for my ERA when I bought it and trying to ID, not a lot of luck with the Jag forums, wondering if anyone has an idea. They are new/unused and if usable of the Cobra I may hang on to them.

Thanks!

[My427stang]

Sorry, it will not let me upload more than one image....

[Grubby]

I believe 93-96 XJS. It was the only years you could get the type of standard rear used in ERAs that had outboard brakes. So, basically an XKE, XJS or XJ6 rear with outboard brakes.

Someone with an ERA wanting outboard brakes would love to have them, since ERA will no longer sell the ERA custom rear.

I am not sure on value.

John

[PDUB]

...looks like standard Jag outboard brake hubs from 94-96 XJS cars. I think they were available on a few other models, as well, but don't quote me on that. Bolts up to the standard Jag center section, from the fulcrum bracket out - meaning lower inboard fulcrum bracket/control arm/hub, and spacer for the brake rotor/axle/hub on top. I am using these on my Unique Motorcars 289 USRRC. Below is my suspension in the wild!

It should be noted that there are some subtle differences in the design, one being that there is a different outboard u-joint for the drive axle, an easy swap. Additionally, the lower outboard fulcrum point on the control arm, where it connects to the hub carrier for the outboard setup, uses a smaller diameter bolt shaft, so the lower control arm and hub are specific to this design. I am told that both the control arm and hub carrier can be drilled for the larger bolt and thus work with the older control arms/hubs. A guy Daze has some info on this, as well. I think we even had a discussion on here years ago, when I was first researching this. Hope this helps!

[My427stang]

Awesome guys, in one day you had more info than I got from all the Jag guys and the Jag parts counter.

Makes sense because there are also two parking brake levers that did cross over to exactly what you said the rest was, all the other numbers didn't cross voer though

I will look under the car to see what a swap entails, everything is brand new, so attractive to use, but odds are I will keep whatever is in the car if in good shape

[Grubby]

You will need to put a spacer in place of the inboard rotors. ERA has them.

John

[PDUB]

Does ERA sell this as an option, John?

[Grubby]

I have never seen an ERA with the outboard brakes above, but they should fit with no problem.

If you have ERA supply the standard rear, it will have the typical Jag inboard brake set up.

John

[ERA174]

I'm not a mechanical engineer. However, I don't see the 94-96 XJS to be superior to the standard inboard brake Jag design. The ERA optional outboard brake rear suspension (currently unavailable) was designed to be superior to the standard Jag inboard brake design. The standard Jag rears in the ERA's is more then up to the job for most builds. The torsional loads introduced into the control arms/axel are the down side to the Jag outboard brake design, in my opinion. The inboard braked Jag rear suspension transfers the torsional forces when braking to the solid mounted rear differential, which can easily handle those loads. Although the outboard Jag rear brake design does make the calipers/pads somewhat easier to access, I believe the inboard brake design is superior. Now, If my conclusion is flawed, please someone enlighten us all, no offense will be taken.

[PDUB]

...like any engineering solution, there are tradeoffs. As you point out, working on the rear brakes of the original Jag setup is horrible at best, even with a lift. Many here can chime in with support on that. Access is bad, period; a hatch helps some. The brakes do not cool as well in a performance application. They are subject to oil leaks under the car, etc. Its real advantage is unsprung weight, which improves ride and handling.

An outboard brake setup is original to the production Cobra. Cooling is better, and you have the option of vented rotors. I think the rotors are larger with better calipers. There is less likelihood that leaking oils will foul the pads/rotors. The parking brake design is improved. You could even implement the anti-lock feature if you were really industrious; read . Torsional loads are about the same, either way, as you have acceleration and braking. And when it comes to servicing them, no comparison - outboard baby!!

Performance wise, the outboard system has the edge with better cooling larger vented rotors/calipers. Others will add their thoughts... and clarifications.

[Grubby]

Outboard brakes have a cool factory even if they perform the same.

John

[PDUB]

Originally Posted by Grubby

Outboard brakes have a cool factory even if they perform the same.

John

Definitely !!

[cobrarkc]

See my gallery for my conversion

[My427stang]

I would anticipate braking with a broken axle should be a benefit

However, unless I have something leaky or worn with prohibitive cost or availability, I really don't plan to change

[patrickt]

Originally Posted by My427stang

I would anticipate braking with a broken axle should be a benefit...

You don't have to brake at all. With a Jag rear if the axle brakes the wheel flops over and the car drops down on to the pavement.

[Buzz]

Originally Posted by patrickt

You don't have to brake at all. With a Jag rear if the axle brakes the wheel flops over and the car drops down on to the pavement.

Awesome safety feature! Those Jag engineers thought of everything!

[louza]

I agree you don't have to brake.

snaptube vidmate