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Rebuilding Jag 4 pot calipers

1154 Views 0 Replies 1 Participant Last post by  Rat Patrol

You can tell from my avatar that I'm not a Jag owner - however I am undertaking a front brake conversion to my car over to Jag XJ calipers (series 11 and 111 , 4 pots)

1st some background - My car is a 1971 Chrysler Valiant Charger - basically the Australian designed version of the Dodge Charger.

And stops as badly as most US based cars, with horrible single piston Girlocks which break the slider pins regularly.

I race the car down the Qtr mile (low 12sec but soon to be high 11s......and drive it on the street - so it needs to be able to stop better than it does, :rolleyes:

As it happens - Jag 4 pot calipers bolt straight up using just a 3mm spacer washer and a different line fitting - so a brake upgrade is quite an easy modification.

I have sourced a set of used Calipers, removed the dust boots and the pistons (boy was that fun! ,), hot washed the calipers and have purchased a new seal kit.

What I need to know and am hoping someone will tell me is:

- What is the best way to remove the seal inside the piston bore?

- What is the easiest way to replace the seal with a new one?

In my experience, there's always a trick or two in this type of operation, so instead of stuffing around and ruining the seal or the bore- I'm hoping someone can clue me in?

I have a couple of questions about the dust boots as well - but we'll start with the seals.

Thx in advance.

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