Anyone have any experience of Range Rovers?

I have a 1990 G-Reg 3947cc V8, with a very noisy abs compressor pump. It's electrically operated and make a "bearing" type noise- looking in the Haynes manual it looks like the pump is a sort of piston arrangement to beef up the abs (and general brake) pressure.

my question is this:
I can buy a recon unit for £135 but rather than depressurising the hydraulic for the brakes and bleeding etc etc, is it possible to break apart the electrical/hydraulic sections? - Looking at the unit there are just 3 allen keys holding the unit together - but I dont want hydro fluid bursting everywhere when I split it.

Thanks in advance
Mole.