XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

Mystery Brake Fitting Size

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Old Jun 1, 2020 | 12:07 PM
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Default Mystery Brake Fitting Size

Hi Guys

On the Plate in the Photo, why is the middle fitting bigger than the two either side because when you turn the Plate over, the fittings are all the same size





Next Question:

As I cannot get under the Car because of lack of space, please could someone tell me which one of these three pipes and fittings goes to the rear brakes, also please notice that the fitting in the middle is a bigger size that the other two

 

Last edited by orangeblossom; Jun 1, 2020 at 12:12 PM.
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Old Jun 1, 2020 | 01:50 PM
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What is this off? the ABS system plumbing? The fittings are different sizes so they cannot be incorrectly refitted.
 
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Old Jun 1, 2020 | 04:22 PM
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Hi Greg

Do the Rear Brakes connect to the Big Hole at the Front or the Small Hole at the Rear of this Master Cylinder?

See Photo:



Which end of this Master Cylinder do the Rear Brakes connect to, Small Hole or Big Hole?
 

Last edited by orangeblossom; Jun 1, 2020 at 04:26 PM.
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Old Jun 2, 2020 | 12:19 AM
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OB, ypu'll want to replace those pipes as such, because they won't take the bending well...

The middle one goes to the rear. There is a connector on the main chassi rail where you can separate it from. A new pipe from the connector to the new master cylinder will do.

The reason it is larger is so you don't set it up wrongly. Don't forget, the rear calipers are always pressurized... I would have thought you knew this, being the ABS expert here...
 

Last edited by Daim; Jun 2, 2020 at 12:28 AM.
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Old Jun 2, 2020 | 02:10 AM
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Hi Daim

I'm not an expert on anything!

Although I did have a feeling that the Middle one went to the Rear Brakes because of its size but since there is not enough space in my Shop to have a look under the Car, I wanted to give it a double check just to be sure

So Thanks to yourself that is now one mystery solved and that one can now be connected direct to the Vacuum Brake Booster, which I am now Retro Fitting and then the Two Front Brake Pipes will then go into a 'Tee Piece' where the Single Pipe coming off that 'Tee Piece' will then go in the other hole of the Vacuum Booster

Which now brings me onto my Second Question

Does the Brake Pipe for the Rear Brakes connect to the 'Big Hole' at the Front of the 'Master Cylinder' or the 'Smaller Hole' nearer the Vacuum Booster part?



Which hole is for the Rear Brake Pipe?
 
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Old Jun 2, 2020 | 03:13 AM
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OB,
When the master cylinder (not the same as the vacuum booster) is on the car, as I mentioned in another thread, the FRONTMOST hole does the front brakes and the rearmost one the rear brakes.
See photos etc in this thread:
https://www.jaguarforums.com/forum/x...cement-231049/
 

Last edited by Greg in France; Jun 2, 2020 at 03:41 AM.
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Old Jun 2, 2020 | 04:36 AM
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Hi Greg

Cheers!

Got it now, so the Front Brake Pipe goes into the Big Hole at the Front of the Master Cylinder

Correct?
 
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Old Jun 2, 2020 | 04:42 AM
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Originally Posted by orangeblossom
Hi Greg

Cheers!

Got it now, so the Front Brake Pipe goes into the Big Hole at the Front of the Master Cylinder

Correct?
Correct
 
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