Cleaning ABS sensors

DionM · 21st January 2006, 08:21 PM

Hey guys,

Got an intermittent HDC fail light coming up on the Freeo of late. Took it to the dealer last Friday when the light was up, read it as a front ABS sensor fault.

So I pulled the wheel off and the sensor came out easily (dead simple job) and it was a bit dirty, so I gave it a wipe down. Put it back in and all was good.

Out driving in the rain today and light came back up again. I have my suspicions that its going to be dirty again, and due to dirt or mud or something in the covered in teeth sensing area.

To clean down in the sensor teeth area properly (only got access thru the little hole where the sensor came out), can I squirt some WD40 or something into it (plain water maybe - or maybe some lanotec)? I presume there is a drain on the bottom. Plus I suppose I'll need to rotate the teeth, which will mean putting it up on 4 stands (viscous centre diff) :?:

**LandyAndy** · 21st January 2006, 08:36 PM

Hi DionM
I wouldnt think you need to jack up all 4 wheels,just the one with the problem,unless your front diff has a locker fitted.
It will be interesting to see how much crud you find in there,please let us know.
Andrew

DionM · 21st January 2006, 08:39 PM

Originally posted by LandyAndy
Hi DionM
I wouldnt think you need to jack up all 4 wheels,just the one with the problem,unless your front diff has a locker fitted.
It will be interesting to see how much crud you find in there,please let us know.
Andrew

That's what I thought, but when I had one wheel up the other day I couldn't turn it (though I didn't try too hard).

**101RRS** · 21st January 2006, 08:58 PM

My Freelander is approaching 200,000k and has spent the last 70,000k on dirty muddy roads a lot so the chance of the ABS rotor getting dirty is great. I have never had the problem.

I recently had the front drive shafts and the ABS sensors out - both fronts were dirty but the ABS rotors were relatively clean. I suggest you do squirt WD40 down as you intend but clothe something you can poke down the sensor hole in some soft material to wipe the rotor as you turn it.

If you lift both front wheels off the ground, you should be able to turn the driveshaft - the opposite wheel will just turn in the opposite direction with no drive going to the rear.

Garry

DionM · 21st January 2006, 09:06 PM

Originally posted by garrycol
My Freelander is approaching 200,000k and has spent the last 70,000k on dirty muddy roads a lot so the chance of the ABS rotor getting dirty is great. I have never had the problem.

I recently had the front drive shafts and the ABS sensors out - both fronts were dirty but the ABS rotors were relatively clean. I suggest you do squirt WD40 down as you intend but clothe something you can poke down the sensor hole in some soft material to wipe the rotor as you turn it.

If you lift both front wheels off the ground, you should be able to turn the driveshaft - the opposite wheel will just turn in the opposite direction with no drive going to the rear.

Garry

Thanks Garry. From RAVE I can see that your ABS sensors are different to mine (yours have better sealing - mine are just bolted to the hub, no gasket or the like for protection). We did a couple of (shallow) water crossings on the trip so may have exacerbated it (plus following other 4WDs who stirred up the water).

**DEFENDERZOOK** · 21st January 2006, 09:38 PM

Originally posted by DionM+--><div class='quotetop'>QUOTE(DionM)</div><div class='quotemain'><!--QuoteBegin-LandyAndy
Hi DionM
I wouldnt think you need to jack up all 4 wheels,just the one with the problem,unless your front diff has a locker fitted.
It will be interesting to see how much crud you find in there,please let us know.
Andrew

That's what I thought, but when I had one wheel up the other day I couldn't turn it (though I didn't try too hard).[/b][/quote]

<span style="color:blue">did you have the boxes in neutral....?</span>

DionM · 21st January 2006, 10:11 PM

[quote=DEFENDERZOOK]
<span style="color:blue">did you have the boxes in neutral....?</span>

No.

ops: And the other wheel on the ground.

**DEFENDERZOOK** · 21st January 2006, 10:38 PM

<span style="color:blue">with the box in neutral you only need to jack up one wheel.....
the prop shaft should spin....
if the diff is locked you will need to jack both wheels....</span>

**101RRS** · 22nd January 2006, 08:59 AM

[quote=DEFENDERZOOK]<span style="color:blue">with the box in neutral you only need to jack up one wheel.....
the prop shaft should spin....
if the diff is locked you will need to jack both wheels....</span>

It is a freelander - not a disco or defender - no centre diff on the prop shaft - when unlocked the viscous coupling takes about 300 ft lb to turn it at the wheel hub so it is not a simple means of lifting just one of the front wheels of the ground. There is no way of completely unlocking the VC. If you just lift one front wheel of the ground then you will need to apply 300 ft lb of torque to turn the relevant front driveshaft.

Both front wheels need to be off the ground to stop drive trying to go to the tailshaft and locking everything up.

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