I think I've called it the right thing - it could also be the brake balance valve.
I'm referring to the brake part that is attached to the innder guard just in front of the firewall on drivers side of a Mk 2 Escort. All the brake lines run through this.
Query is - is there an after market replacement for these or is it just a case of hunting through parts boxes and old cars. Mine has a continual leak & I want replace it. I think I've got a spare somewhere, but its condition is unknown (ie: does it work/leak). I'd rather replace it if there is something new that I can put in place.