Hi to all, I have been reading every single post for some time now, but don't feel I have the knowledge to contribute, so mostly a looker, pretty new to tje XJS world and have an 88 amd a 89, both coupes.

I hope I can be clear on my question, on the 89 the rear brakes are sized and the rotor got damaged, so I am in the process of taking down the cage to replace calipers and rotors, I think the car has a Salisbury diff since it has the draining plug on the bottom. I have read the Salisbury and the Dana rotors are different, and looking at some vendors illustrations it looks like the Salisbury rotors have the two "acces" holes closer to the center, as opposed to the Dana rotors which have the two "acces" holes further from the center and go into the tapered part of tje rotor. I hope I am being clear.
I am ready to order the rotors, probably from RockAuto, but this morning I went to look at tje rotors on the 1989 XJS with a Salisbury differential and noticed it has what looks to be rotors for the Dana differential, is this possible? Can the Dana rotors be fitted to the Salisbury diff? I went to see the rotors on my 1988 XJS wich has the Dana diff (no drain plig at the bottom) and the rotors look exactly the same... Any idea if the previous owner might have screwed up amd thos is the reason for the brakes to be sized? This is a new to me car. I will try to post a pic of the rottors on the 1989 XJS with the Salisbury differential.

 

Either rotor will fit on either diff. However the Salisbury rotors on the Dana diff will make the caliper mounting bolts difficult or impossible to get to as they come in from the opposite side as the Salisbury diff.
If you have a drain plug, you definitely have a Salisbury diff.
Jon

 

Thanks so much for your reply, just to have this clear, so the Dana rotors on the Salisbury diff will make removing the calipers almost impossible, this is also with the irs cage removed from the car?

TIA
Alfredo

 

No, Salisbury discs on a Dana will make removal difficult.

 

Jon,
Thanks so much, now is clear.

Alfredo

 

Alfredo,

Assume you have the Teves ABS on your "89" car, but not on what you call an "88"?

When you remove the calipers from the pads / remove the pads, absolutely do not push the pistons without first connecting a pipe to the bleed nipples and loosening the bleed nipples to let the fluid escape that way. It's really important that you don't push fluid back up the brake lines on a Teves ABS car.

Good luck

Paul

 

Thanks for the advice, yes, my 89 has ABS and the 88 regular servo assisted brakes... Thinking about retrofiting the 89 to non ABS brakes, but that will be done later on.

 

Excellent idea!