I go to the internet or Hemmings and find an outfit that does that kind of work and send the parts off so the magic can be performed! But there are no 'brake specialists' in my neck o' the woods.....not that I've ever found, at least.

What I'd like to do...and it's often possible....is research the part numbers you've provided and try to find a common interchange. IME that helps ensure a positive outcome when parts hunting.

Of course, if a person were to just call a specialist and describe what's needed you might well get a positive response. My experience, though, suggests I'd more likely get an over-the-phone equivalent of the 'deer in the headlights' look . Here in the 'States that's pretty common when "Jaguar" is mentioned!

Cheers and thanks
DD

 

Well , If you ever need a description of the reservoir seal..... ,

P7591 - ( O ring type ) OD ........ 25.5 mm
ID ......... 18.5 mm
height ......... 3.7 mm

P7592 - ( step down seal ) OD ........ 23 mm
I D ........ 6.3 mm
height .........8 mm

Those two numbers were common on the XJ Series III

 

So here is my new master cylinder setup.




The MC is from a 1994 Mitsubishi Galant with ABS (28$ from rockauto)
The Reservoir is from a 1994 Dodge Caravan
The booster is series 3 Xj6

The reservoir was taped to accept a 3/8 90 degree barb and then plumbed to the MC. The reservoir has a hand made bracket to it in place made from 1/4 round bar stock.

The MC bolt holes need to drilled out to 29/64ths in order to bolt up the the Jag booster. New lines need to be fabricated but the MC top fluid line exit make this easier.

I have a cap with level sensor on order.

The MC has a 1 inch bore, a nice modest upgrade over the 15/16 original. This offers some reduced pedal travel yet still provides excellent feel with modern pad materials.

This setup solved a few problems important to me...

- Reduced weight...this performance coupe is on a serious diet and the aluminium master weighs much less than the OE iron piece.

- Modern seal design offers improved feel and no weeping.

- Larger bore reduces pedal travel slightly

- Better fluid line routing. I loath the Jag OE master cylinder because the fluid exist on the wrong side for a LHD car and the brake lines mist make a loop.

- Easy and low cost availability of level sensor cap, the Jag MC cap is expensive to replace and quickly fails. The whole setup new cost about the same as a rebuilt OE master cylinder.

So how does it work...perfect !

 

Yeah, I think brake stores are a past thing now. I do recall them
in the late 40's in my home town. I worked in a full service gas station.
We homed and rebuilt master and wheel cylinders with kits from the parts house. Delivered!!! We sent the shoes out for new material. drums for turning as well. Early AM out, late PM back. Ready to mount. Riveted shoes just being replaced by bonded shoes. At the time, if the drums were turned a out a lol, the shoes were shimmed to fit. Much later, disallowed.


At the time, my daily ride was a neat 34 Chevrolet standard 6. One of it's weaknesses was the rear axle. Stripped gear teeth, busted bearings, etc.... So, once, we went to a scraper. We removed an entire rear end from a similar 35. Might have been a better car....


Oh, oh, brake shoes no good. Sent the ones from the busted
34 in for reline. Got them back. More, oh, oh, too narrow !!!


Obliging brake shop redid the 35's for no extra charge. I guess
they were nice guys and kept the redone 34's for stock, in a dim hope
of using them.


Repeated decades later !!! 64 Comet wagon, this time.


Carl

 

Mike, Thanks for the info about a substitute M/C & reservoir. This is something I will definitely follow up.

It will go on my list of "near future" projects along with the rear outboard disc brake setup (currently collecting/refurbishing the necessary parts).

Got one question how did you mount the resevoir ? ie What is it connected to?

Thanks again this may be the the solution I have been looking for,.. to use on my 86 XJ6.

 

To mount it I simply made a sheet metal flange with two bolt holes and it bolts to the back of the booster in the same way Jag mounted the remote reservoir on the series 2.

More info...not that is matters much but my name is John.

You may want to consider this... A chap with an XJS used Mitsubishi parts too!
Upgrading the Brake Fluid Reservoir

The non abs MC has a 15/16 bore just like the OE Jaguar unit.

Mitsubish has quite a few MC setups that would work. This from a 95 to 99 Eclipse would work out well too.
See this ..... 1995 Mitsubishi Eclipse Master Cylinder Brake System 2 0L L4 16V DOHC | eBay

 

Ooops ! i had a senior moment and did not realize who had come up with the good info. Great effort John...sorry for not using your correct name..

Thanks for the follow up regarding the mounting method ...make sense.

This really good info I always thought there was a solution such as this,.. but with so many projects going on, I simply had not gotten to doing any research. I, for one, am happy you did John, thanks again.

 

Yeah, me too! Great work.


Well, at least the reservoir to MC joint in my lump does not leak.


The level indicator is a slick little device. But, alas, one of the male spades is busted. Why???? At one time, I had a bit that "bit" the stub an allowed the female part to slip on. It got lost.


I've a spare, but it is rough and so far disfunctional. More messing with delayed when my "knock off" Dremel expired.... Battery issue.
Tool to be "fixed....


Carl

 

Hey Sid, Any ideas on finding just the reservoir for the S3, at a reasonable price.
I was leaning over the fender and apparently put my substantial belly girth on the MC and cracked the plastic base.
Thanks, Jim
86 Series 3,
Arizona

 

Hello Jim ,

If haven't already been to ebay , punch in 13-2456 , you can buy a complete Master Cylinder in the states for what I can by a second hand reservoir here in Aus .

Cheers ,

Sid

 

"reasonable price" ight be tricky

Google "CAC3217 Jaguar" and you'll get lots of hits

Or try EverydayXj for a good used one

I've turn a couple of non-leaking m/cylinders into leaking one with my own girth so don't feel like the lone ranger . they're mounted in a very exposed position

Cheers
DD

 

Thanks Guys!

 

We have a "Brake Masters" here in Arizona. They are a chain of nothing more than "Auto Repair" shops. They do not inventory much at all. Especially classic car parts.
If we need a sleeve in the MC, we buy a rebuilt unit and turn in the old one as a core for some unknown facility to rebuild. Same with shoes. Rebuilding components our self, or dealing directly with the "re-builder" has become obsolete. Almost everything come from the parts stores, who in turn deal with the manufacturers and re-builders.
Different worlds I guess. Not always the best thing but it is what it is. The internet has helped allot but then you have to deal with shipping time and cost.

I thought I had leaned on, and ruptured my reservoir. Not seeing any cracks, I rigged up a way to pressure test it. Checked OK. Apparently, the seals connecting it to the MC were hardened and couldn't take my girth pressure. Installed seals from a rebuild kit and all is good.
Take Care,

 

Is there supposed to be a seal in between the MC and Servo as well? Not sure, replacing Wednesday.