Abs or something else

macafee2 · 26th August 2022, 18:07

Related to this thread, https://www.the75andztclub.co.uk/for...d.php?t=320693

Looking for advice.
Under light braking it feels as if the ABS is kicking in on a CDT Tourer mk1 and there is a metal to metal rubbing sound. Feels as if it is the front offside wheel but this could be a red herring.
We had both front wheels off and could not find anything loose. Pads have a lot of meat on them and discs nice and smooth. Car pulls up straight and no wheels seem to skid.
At the weekend Eric (alpine) has said he will have the rear wheels off. This may revel something but in the mean time, have you any suggestions?

Can a T4 test the ABS?

thanks

macafee2

Mike Noc · 26th August 2022, 21:08

Yes it can Ian.You can display the roadspeed of each sensor in real time driving slowly, and you should see a blip in the speed of the faulty wheel. You may also get a plausibility fault displayed because, although missing sensing one or more of the magnetic reluctor segments won't cause a fault code because it mimics a wheel locking up, it isn't plausible for the same wheel to keep locking up when none of the other wheels do.

Alternatively use a voltmeter and measure the change in voltage from 0.7v to 1.7v as each magnetic reluctor segment is sensed. There should be 48 changes for each wheel revolution, and you can chalk them up on the tyre wall.

26th August 2022, 18:07	#1
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,987 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	Abs or something else Related to this thread, https://www.the75andztclub.co.uk/for...d.php?t=320693 Looking for advice. Under light braking it feels as if the ABS is kicking in on a CDT Tourer mk1 and there is a metal to metal rubbing sound. Feels as if it is the front offside wheel but this could be a red herring. We had both front wheels off and could not find anything loose. Pads have a lot of meat on them and discs nice and smooth. Car pulls up straight and no wheels seem to skid. At the weekend Eric (alpine) has said he will have the rear wheels off. This may revel something but in the mean time, have you any suggestions? Can a T4 test the ABS? thanks macafee2

26th August 2022, 21:08	#2
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,579 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Yes it can Ian.You can display the roadspeed of each sensor in real time driving slowly, and you should see a blip in the speed of the faulty wheel. You may also get a plausibility fault displayed because, although missing sensing one or more of the magnetic reluctor segments won't cause a fault code because it mimics a wheel locking up, it isn't plausible for the same wheel to keep locking up when none of the other wheels do. Alternatively use a voltmeter and measure the change in voltage from 0.7v to 1.7v as each magnetic reluctor segment is sensed. There should be 48 changes for each wheel revolution, and you can chalk them up on the tyre wall.