Hendrik Posted February 9, 2016 Share Posted February 9, 2016 Done a lot of research on this forum, but no luck so far. On my 2001 Td5 Defender I've changed discs, calipers, pads and brakelines (flexible steel ones) all around. been bleeding the brakes for at least 10 times (both manual and with a pressure self bleed system) with no air coming out of any the calipers when driving I have brakes, but still feels like a sponge... when you push hard on the pedal (engine running) you can feel that it is going down very slow. any tips/recommendations or anything I overlooked (only option I can think of is the mastercilinder... ) thanks a lot for your help! rgds H. Quote Link to comment Share on other sites More sharing options...
Aragorn Posted February 9, 2016 Share Posted February 9, 2016 If the pedal is creeping to the floor with a steady pressure applied it could be a bad master cylinder? Have you got the calipers on the correct sides with the bleed nipples at the top? Impossible to bleed them if they're upside down! Quote Link to comment Share on other sites More sharing options...
Shackleton Posted February 9, 2016 Share Posted February 9, 2016 In my experience a pedal that slowly goes in under pressure is a seized piston/caliper. Had that symptom/solution on a Mini once. Have the calipers all been changed for new? [from a quick search the D2 and Mini seem to both have a diagonally split system, so could be the same thing] Quote Link to comment Share on other sites More sharing options...
Souster Posted February 10, 2016 Share Posted February 10, 2016 +1 on everything Aragorn said. I've made the silly mistake some years ago of fitting the brake calipers on the wrong sides. And couldn't get them to bleed! Nightmare of a time, but I'll never make the same mistake again. So make sure bleed nipples are at the top. How does the pedal feel when the engine off and the vacuum pressure extinguished. Any creep? Don't forget the pedal will be softer when the engine is running. Have you checked your wheel bearings too? Just throwing a few things out there. Hope it helps Quote Link to comment Share on other sites More sharing options...
Maverik Posted February 10, 2016 Share Posted February 10, 2016 Funny this, as I've got exactly the same issue, 2002 Td5 Defender 90 non ABS, all new genuine callipers/discs/hoses/pads and Master cylinder, but getting the exact symptoms as you, which were the exact symptoms before I changed the master cylinder too, so it could be a new duff TRW master cylinder, but not convinced. I've not picked that project up for a while as been busy doing other things, but my next thoughts where to clean/replace the bias valve, having a thought that air could have got trapped in there somewhere. The symptoms from my experience are that of a bi-passing master cylinder - but something's just not adding up, and not got the cash right now to try replacing the master again. Quote Link to comment Share on other sites More sharing options...
Hendrik Posted February 10, 2016 Author Share Posted February 10, 2016 it's a strange world... after bleeding the brakes god knows how many times yesterday and the spongy brake, I left the car for the night. drove it today for about 10 miles to MOT to have it checked and the brakes worked all great. even had a comment from the guy to say the brakes worked extremely well... All this without touching the brakes after last night... weird! thanks a lot anyway for your help! Quote Link to comment Share on other sites More sharing options...
western Posted February 10, 2016 Share Posted February 10, 2016 possibly a trapped slug of air that has manage to work it's way back to master cylinder fluid tank, good to read they are OK now. Quote Link to comment Share on other sites More sharing options...
Maverik Posted February 11, 2016 Share Posted February 11, 2016 Wave your magic wand over mine too if you please... Quote Link to comment Share on other sites More sharing options...
Hendrik Posted February 11, 2016 Author Share Posted February 11, 2016 Wave your magic wand over mine too if you please... will send it over to you Quote Link to comment Share on other sites More sharing options...
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