Hello my friends.

Finally get time to put this beauty on the road.

I have be reading and preparing to replace these switches with ones off a parts car that I've been tearing apart.

In the manuals that I have been going through, they talk about using a JD 137 tool. Cannot find out what this tool is or does. Do I really need this tool, or is there a trick of the trade that I could attempt.

Do I even need this tool if I am replacing the switches with ones from the parts cars.

Thanks for your your time and responses. Long live the Jaguar

 

Well found out what tool JD 137 is. Just a basic driver that you place different bits in them. I believe it says bit PM4. Probably some kind of sharp pointed tip.

Seen some different pics of the switches. So it seems pretty basic.

Now should I replace the O-Rings also?

Do I have to replace both switches?

 

I would replace the O rings, can't help with the switches themselves...

 

Hi Wewillbefree,

I can't recall the setup on our '88, but do the switches you describe mount on the motor and pump valve body on which the accumulator also mounts? If so, I can only recall one switch, part 2 in the diagram below from jaguarclassicparts.com:




If that is the switch you are describing, it's called the "Combined pressure and warning switch," and it just threads into the valve body and you just need an open-ended wrench that fits the flats on the switch body. It would be a good idea to replace the O-ring, but you'll have to do your research to be sure you use an O-ring of the correct material to withstand the hydraulic fluid. I assume Viton would probably be OK but the Buna N type used in water plumbing might not be, but please do your homework. You can find an O-ring compatibility chart here:

https://www.sealingdevices.com/docum...patibility.pdf

Cheers,

Don

 

Thanks for the o-ring link Don!

 

Hello Don

Cannot thank you enough for your info.

I tried to get a picture of the hydraulic system from jaguar classic parts, but they do not seem to have any pics.

Just switched over the accumulator along with the two switches that were attached to it from the parts car. Figured it would be easier and it was.

The leak was coming from the lower switch. At least now I have an extra accumulator and upper switch.

Anyone knows how much hydraulic brake fluid to add. Do I just push the VCM button to reset the message board.