Planing to change Disks and Pads as well as restore Calipers both front and rear.
I will be removing the front hubs and replace the bearings as well.

I'm not a mechanic and fairly new to this. Can I have some advice on how I should handle the ABS system during the process?

 

akexandrou_p,

3 suggestions:

Absolutely do NOT push back the caliper pistons to remove the pads without undoing the caliper bleed nipple and allow the piston displacement fluid to escape via a pipe connected to the bleed nipple. You must not allow fluid to get pushed back to the abs valve block.

As you're changing calipers, its worth changing all the fluid, so that means also bleeding the low pressure side of the system.

Make sure you know how to bleed the wheel circuits of this non-conventional system properly. And use the Teves procedure not the original Jaguar procedure. I have posted the procedure for both the Low Pressure Side and Wheel Circuit Side a number of times. If you search the Forum you should be able to find it.

Goid luck

Paul

 

Dear Paul,

Can you point me to the right direction for obtaining the right workshop manual for my car (1994 AJ6 4.0 RHD)?
I have already purchased an electronic version over the internet which is worthless.

Thanks
Petros

 

Petros,

The difficulty with getting a good workshop manual is that the original Jaguar ones were very large, running to 4 volumes, and so no-one else published a decent aftermarket one, especially for the last facelift cars.

After the cars went out of production, Jaguar Classic Parts division entered into a commercial arrangement to create CD-ROMS that combined the Parts &Service Manuals into a single publication. Sadly, many years later there was a commercial dispute and they were withdrawn from sale. It's also true that some of the early versions required very specific version of Adobe Acrobat and didn't work on Macs.

A number of people seem to market various CDs / DVDs . that purport to be service manuals for our cars. I have little experience of these, and there may be some that are direct pirate copies of the original workshop manuals. However, as you've found out, the quality can be variable!

So, if I were you, I would try and find the original Jaguar CD/ROM Parts & Service Manual that was applicable to the late 4 litre facelift cars. They often turn up on ebay either .com or .co.uk
The one that you want is part number JHM1143 Maybe start by googling that?

Good luck

Paul

 

I don't recall any specific abnormalities with the 94 brakes system as far as the pads and disks.
There is one issue that needs to be watched carefully.
When disassembling the caliper from the suspension there is a shim between them.
I found my shims on the ground after everything was bolted back up.
Finding out where they were supposed to be was the first problem.
Actually getting them back where they belong was another.
The difficulty I had was trying to avoid a complete tear-down.
I couldn't get enough space between the lower bolts by loosening the top.
The shims dropped out before I could get the lower bolt in place.
I should have greased them a bit so they would stick in place.

 

Hi Equiprx,
My 1995 XJS pulls to the left quite a bit when I brake so I was thinking I'd just renew the pads, rotors and calipers. However, I have not come across shims for the calipers before and so that makes me nervous. What is the purpose of those? Is it to align the pads to the rotors ? How critical or how exact do you have to be in placing the shims back in? I've done pads and rotors on a bunch of cars but needless to say the XJS looks a bit different.

 

The shims are not an item that wears out per se.
They are only an issue if you remove the calipers in order to change the rotors.
It was so long ago I don't feel comfortable answering your question.
A current owner who does their own maintenance would know more.

 

thanks for the reply. Not knowing why the shims are there, i am not sure what to do if I replace the rotors or if I replace the calipers. Do I need to put a dial gage on something or other. Or if I loose a shim what do I need to check to determine how Much I should shim it?

 

You need to just be careful when you disassemble the brakes.
The shims are critical for alignment so just don't toss them.
Mine wound up on the ground and I had to redo the job to put them back in.
It was so long ago I don't remember how I figured out where they go.

 

I just recently removed my caliper to check on a problem.

I didn’t recall seeing a shim.

 

Item #21 in this illustration:


https://parts.jaguarlandroverclassic.../brand/jaguar/



If you are not aware of their existence....most people aren't.....you may have missed them entirely. They're very thin and often fall to the ground without being noticed. Or, they may have been missing from before you even owned the car.

These shims take up the gap between the steering arm and the caliper. Without them the steering arm will be under a bit of tension when you tighten the bolt. I've never heard of one breaking from the stress....but you never know. Plus, if the shims are lost, the toe setting changes.

Cheers
DD

 

I concur with that.
When I did my first brake job If I didn't find the shims on the ground I would never have known.

 

Is there a part number, or something in the JDHT diagrams that I can reference?

It is possible that I found the shim and I would have put it back together the way I found it, not thinking twice about. So I'm sure I might not recall dealing with it because it really is a very common part of wrenching, right?

There are shims up to VIN 188104, part numbers C334401, C334402 or C33440....are those the ones you're referencing?

Or perhaps #21 on this diagram? https://parts.jaguarlandroverclassic.../brand/jaguar/

I think I did recall seeing those. (#21, or C441462)

 

I realize this is an old thread, but after finding my shims on the floor, I started researching here and found this thread...I have shims on my xjs vin 188468...so maybe that was for a different model?