rekab69 Posted July 8, 2015 Share Posted July 8, 2015 Hi Guys, My 110 Td5, 1998... has an ABS fault.. No surprise there I hear you say...!! On start up both ABS & TC lights illuminate, after a few seconds the TC light goes out, on the move after 5 odd mph the ABS light goes out. Hooray, thats exactly as it should be...!! Can drive around at low speed, then run it up to 75 mph both lights stay out.. Wait for it....?! UNTIL... I touch the brakes, the very first time I brake they pop up... D'oh! After having the codes read countless times, it always pointed to the front right sensor.. Work carried out so far... 1. Check resistance of front sensor. OK. 2. Renew front right sensor. 3. Run new front right sensor wiring back to ABS ECU. 4. Change ABS ECU. 5. Rebuild front right hub. 6. Install new rear sensors. 7. Make a bracket to hold front sensor in place. 8. Run modulator internal wiring to external. 9. Adjust rear wheel bearings as slight play was picked up by MOT. My gut feeling it something is throw the sensors out of place but if I turn off the ignition, and back on against resets it's self until I touch the brakes. My ever so helpful Landie garage suggests removing the modulator as there are places it can get gummed up, which he knows from experience.. As you may well know and thank you for bothering to read this far, this is a pig of a job and one that has been done before to install a second hand modular a few years back so I feel since I have renewed the brake fluid quite a few times over the past few years I think I am clutching at straws & I have run out of options.. any bright ideas other than removing the whole system...?? Thanks in advance. Dave.. Quote Link to comment Share on other sites More sharing options...
duncmc Posted July 9, 2015 Share Posted July 9, 2015 If it is speed related, what about the speed sensor? Maybe? Can't think why else 75mph should be a magic number that it stops working at. Or front right reluctor? Quote Link to comment Share on other sites More sharing options...
elbekko Posted July 9, 2015 Share Posted July 9, 2015 Brake switch? Quote Link to comment Share on other sites More sharing options...
LiftedDisco Posted July 9, 2015 Share Posted July 9, 2015 Are your reluctor rings properly seated and rust free? At 75mph they will be moving awfully quickly and the smallest discrepancy could be enough to trigger the ABS... You can get the same effect if you have got mud and crud in there as this will affect the sensor seating or, bizarrely, if you've given the sensor a good blast with the jet wash, this'll also mess them up... My money is on the reluctor ring(s) not being properly located (or crappy)... Good luck! Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted July 9, 2015 Share Posted July 9, 2015 Reluctor rings on the CV joints? Then you may have one of these wobbling around or missing teeth, despite the hub rebuilt...? Quote Link to comment Share on other sites More sharing options...
rekab69 Posted July 10, 2015 Author Share Posted July 10, 2015 Thanks for your replies Guys, I'll check the reluctor rings.. One note though, they light back up at ANY speed not just 75mph, they are triggered by the first use of the brakes after start up.. Turn the ignition off & back on again, (even whilst on the move!) and they go out, touch the brakes and back on they come.. Cheers, db. Quote Link to comment Share on other sites More sharing options...
pete3000 Posted July 10, 2015 Share Posted July 10, 2015 I'm not suggesting you do this....... but for a slight touch of the brakes on a private road....... could you swap the left front to right front sensor input to the ecu ad see if the fault code goes with the swap. This would the rule out the ecu if it does or leave the fault at the right front wheel area. Quote Link to comment Share on other sites More sharing options...
elbekko Posted July 10, 2015 Share Posted July 10, 2015 Thanks for your replies Guys, I'll check the reluctor rings.. One note though, they light back up at ANY speed not just 75mph, they are triggered by the first use of the brakes after start up.. Turn the ignition off & back on again, (even whilst on the move!) and they go out, touch the brakes and back on they come.. Cheers, db. That's what I gathered from your first post, and exactly why I suggested the brake switch. Check it out. Quote Link to comment Share on other sites More sharing options...
LiftedDisco Posted July 10, 2015 Share Posted July 10, 2015 Is it just the lights coming on or is the ABS actually activating? When I had issues with mine, the ABS would kick in, fortunately at low speed, but the overall effect was quite scary with both pulsing and (it seemed) limited braking effect... Quote Link to comment Share on other sites More sharing options...
rekab69 Posted July 10, 2015 Author Share Posted July 10, 2015 No time to get my hands dirty to check it today, but I did drive it around for a while and it's changed to the TC light doesn't go out on start up now but after 5mph..along with the ABS and both come on but now not after first touch of the brakes, just random now..? It only sat on the drive over night... !! Just the lights coming on Lifted Disco, ABS stops working, works when the lights are out.. and I did give it a good pressure wash a while back too.... I'll have a play over the weekend.. db.. Quote Link to comment Share on other sites More sharing options...
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