You could bypass it with a section of brake pipe and save paying the extortionate price if you so wish????...Just a thought if at all possible??? You could ask a braking specialist to see if you use another cheaper valve that'll do the same job?
My 110 has this valve...don't know enough about the system but I'm interested if it ever gets banjaxed.
200tdi Ex British Army 110 Hardtop 139142kms
2.286 Petrol Series 3 Lightweight 75,043kms
3.2DiD Pajero 266,000kms
Yamaha XTZ660Z Ténéré 58112kms
Gas Gas 300EC Ohlins Enduro Moto.