OK, found the problem! In the brake servo, there is the plunger/rod that goes into the master cylinder - it is this that drives the piston. It's held in place by a star washer/clip - turns out this was loose - so as the engine runs, the vibration causes the plunger/rod to shift about...

Forgot to add, the replacement MC is a delphi one, so not really cheap ebay rubbish , but not the best of course.

Well the new MC stopped the sinking of the pedal, so I don't think it's that; but I think that was the issue previously.

No, it's clean Also no drop in fluid level

Do you mean an air/vacuum leak? The servo is definitely holding the vacuum.

So this is a struggle. I fixed the three amigos around 10 years ago with the bypass mod, but it went wrong again, this time the error was a pump fault, and sending the ABS modulator away confirmed it was faulty and non-repairable. So I got a fully reconditioned unit, fitted that - sorted the...

I don't know if external links are allowed but http://www.handyhowie.co.uk/handyhowie/Disco_ABS_Fault.html has a good description specifically for the disco - I couldn't actually find anything for my defender other than comments along the lines of do the same thing, it's just a bit more awkward...

Yes I have had this and it's a common problem, within the ABS system there are two switches on a plastic mount under the ABS unit, the switches are usually OK, but the connections to these switches fails, the fix is to take wires from each side of the switches connect one to the ground (thus...

Same Landy, older and more problematic - the Landy is as well!

To be honest, I don't need a bump on the head to forget things!! Wash in the morning, walk out of the bathroom a few seconds after, and can't remember if I put my eye drops in or not!

I am pretty certain I was a member here once, but can't remember any username etc so I am either a new member, or a returning one having fell off the Wagon Landy