Think I've seen lex mark ABS sensor for £27 mines been fine for over 2 years .I used a 5 mm drill to drill out the old sensor it came out in little bits .then I used a rat tail file to clean out the rest of the rust once the hole is rust free a smear of silicon grease .it fits like a glove

Hi just seen my LEMARK brand ABS sensor on ebay £20.99 cheaper now than when I got it !

Cheers. Been away for a week so I'll get one this week and fit when there's a gap in the weather.

It's not a bad job I found some utube videos too which help.
If you need a bit of guidance just ask

The old sensor will be stuck solid rusted in so it's best drilled out.
Start with 4mm drill .bits built up to 10mm ..

If you do drill it then be careful as the hole isn't the same size all the way through, there is a seat. It shouldn't matter really as there is the bolt to hold it in place but I assume it helps prevent crud build up, I personally removed them from my spare hubs by heating the hub with a blowtorch to melt the plastic and then just used a pick and a rat tail file to remove the last of the plastic, it took about ten minutes per sensor.

The last time I removed an ABS sensor I just broke it up with a screwdriver and prised the bits out. The best tool in my experience for cleaning up the hole is a 10mm Flex Hone. This fits in a drill is available in various grits, like sandpaper. I think they are designed for cleaning the barrel and chamber of firearms, hence are much easier to find in the US than here. Good for the slider pin holes in the calliper bracket too, but I think 8mm or 9mm is better for them.

Good comments Forrest..all the drilling did for me was to remove enough of the old sensor so it broke up into bits as the rust in that area was pretty bad .the ream tool sounds good as long as non of the actual hub is ground out ..I removed the wheel bearing too .did you ?

O Google reaming drill bits .there's a good choice of tools there for the job !£

Well I got the sensor replaced today, what a job that was...

Sadly it didn't entirely fix the issue as there is now a code 1-5-2 for the RHS. Confirmed with a multimeter. I think I was over excited and didn't read the instructions for the code reader properly. Pressing the button once only returns the first code logged.

Now to do it all again!

Edit: removing the disc also highlighted I'm missing the backing plate. My caliper is in poor condition too, one slider seized and the piston rubber is on its last legs.