Thanks for all of the above. The bleed screws are just for a cheap elimination and nice to have a tight grip in the spanner! Thanks Frostythor, what you say about the modulator makes sense. I'll try cleaning the plugs with contact cleaner first, but suspect a replacement unit is the answer...

Just another thought .....perhaps fitting a stop / start system would fix it! Then I would have a nice firm brake while sitting at the traffic lights!

Thanks for that. That is a great video, but it confirms what I was saying about a hard link from pedal to master cyl piston, so I am baffled as to how the servo can produce a soft pedal. Logically it must either be air trapped somewhere which can only be compressed with the extra shove from the...

Thanks for the link, as you say, maybe try the used one first! I haven't found one in the UK yet. I hope the issue doesn't get any more interesting and that another servo sorts it! Rave p1054 shows a good diagram of a servo. The principle is fairly straightforward, but I can't remember...

Sounds like EBD Sierrafery. Wheels are standard. Yes Frostythor, (brake bleeding woes) this is still the original problem which I had misdiagnosed as leaky master cyl seals. I was only able to rule out Master Cyl when Sierrafery found me a TRW one in Germany and it bled out to a hard pedal in...

Thanks frostythor, Delphi pads have done 250 miles. Caliper sliders were all greased when pads fitted. Hoses all seem fine. With engine off, the pedal is so firm that I can't believe there is air present. Braking isn't too great - it is just about possible to engage the ABS with a sharp jab...

I've driven this Disco 22K and the braking changed about a month ago when this started. I've been using it today and while they still feel safe, the brakes are not as sharp as they used to be, with a softer pedal. It is also disconcerting to be stopped at lights and feel your foot slowly...

2003 TD5 ES Manual. 112K miles. With engine off, the brake pedal is firm. Engine running and the pedal will slowly sink to the floor. (This is well beyond the usual initial dip) The pedal stays firm if the engine is run with the serpentine belt removed so that the vacuum pump isn't running...

Problem solved! It is the servo. With engine running and serpentine belt removed, brake stays firm. Refit belt and pedal sinks to floor. No I don't understand it! As it is not a hydraulic issue will start a new thread.

Thanks for that. Will try a pedal bleed this morning. I should add that the ABS etc has always worked perfectly, but I did fit the shuttle valve mod to clear the three amigos a few years ago.

The problem of a sinking pedal with engine running was the original problem, before I changed the master cylinder. The two pipes I cracked open were on the wing side of the modulator which I think come from the master cylinder. The idea being to stop air from the new cylinder ever getting into...

The new TRW cylinder arrived this AM from Germany! It came without reservoir, but no problem. Looks identical to the LE original. I started by cracking open the two feeds onto the modulator, using power bleed until fluid ran out. Then I bled round it twice with the Hawkeye, but very little...

It is still on the car after I tried to flush it clear. I imagine it is seeping past the seals. I was intending to rebuild it as a spare when genuine seals become available again. (Rimmer @ £84) At that price though, I might see if the TRW one does the trick first! I did have a go at...

Thanks again for that Sierrafery, I've ordered one! The price is good value for a quality make. Yesterday, most of the suppliers I trawled, listed the two part numbers at different prices with a chassis number to split them. Today Island 4X4 list a single "Eurospares" cylinder with both part...

Thanks Sierrafery, I did indeed try that part number, but it's P/N SJC100442 which fits the earlier chassis. My chassis is 3A822066 which needs P/N SJC000100 and that's the one I cannot find. I couldn't agree more about Britpart, but I need to use my trailer to fetch grit & cement, as I have...

Thankfully I have a Hawkeye Total. When I restored the original LR cylinder (as it turned out, with its original fault!) I power bled the system until clear of air. I then bled the system again with Hawkeye and got a load more air out. I even had to repeat the Hawkeye cycle multiple times...

Thanks for that Pawl. I'll contact him in the morning. A recommendation is reassuring! I'd never consider used hydraulics normally, but needs must! Tim

Again thanks for your helpl The original cylinder is on the car and bled out, but behaving the same as when I removed it. I've driven this Disco 22K, so am used to "the dip" on starting! This is certainly not a normal pedal, I wouldn't even drive it like this on the flat, let alone down the...

The Britpart cylinder will be collected by the binmen tomorrow! The OEM master cylinder I ordered was for the wrong car. The OEM seal kit I ordered for next day is on back order. Genuine LR cylinders seem to have vaporised and all the suppliers I've tried are out of stock. The only one I can...

Firstly, thank you all very much for your replies & advice. The Britpart cylinder came with reservoir and all the now 15 litres of fluid were new! (Not the best spend of £79! The question is whether I have the nerve to poor it all around the trunk of a hideous tree, which my wife insists on...