If they've not been touched in the past few years it'll
NOT go to plan
The junctions
will be solid rust, the nipples
will snap off and the flexy's
will be fecked too. I ended up replacing the whole system ... including the front calipers ... when we first tested our van.
If you don't know what you're doing DON'T DO IT ... pay a professional. It will pay off in the long run, you can't scrimp on safety.Oh and make greasing the replacement pipes and ferrules on the flexys every year part of your service regime.
Where are you ? We may be able to recommend someone we all know and trust not to bend you over, Simon 'Brickwerks' Baxter, Marcus 'Mercdoctor', Steve 'Gasure' Shaw.
** Just re-read your profile

... Marcus and Tracy Mercdoctor are only in Coventry ... just over the road from you .... give him a bell.

**
Ian.