Just found the user manual. Um brake fluid level . Now to open bonnet - fingers crossed that is all it is although I seem to recall checking that recently...
I advise you check all lines etc for signs of a brake fluid leak
(you may have damaged something on your off roading trip)
if nothing is evident, keep a close eye on fluid level for the foreseeable future to rule out minor leak
just to be on the safe side
Runs of course but blimay that tapping is horrible with the bonnet up.
have you done a recent oil and filter change?
sticking hydraulic lifters are very common
some nice fresh 20/50 mineral oil every 3k is cheap as chips
low voltage will effect the cars ECU and engine running anyway
Voltmeter he say 11.8 Volts !. I tried that on the battery terminals and also with the -Ve on the Alternator body (I have a nice fat extra earth lead anyway). I revved the engine to achieve 12.2 Volts. ABS light still silent so I suppose its all voltage related. So tomorrow I will find my alternator off the Blue Carlton. Hopefully I can try just the brush/regulator pack - if I am not talking baloney ?. Mind you I would like to try and see what the voltage is at the Alternator +Ve. All that disassembling can be practiced on my spare alternator on the table in the warm where my back is happier.
why not just slap in the complete replacement alternator
it's easy to get at, very easy job to do.
only requires 8mm,10mm, 13mm spanners/sockets
just disconnect the battery while you do it
(probably a good idea to stick the battery on charge anyway )
with the engine running 11.8v is way too low
surprised it even runs