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I did this today,and it's pretty easy once you've given the bolts a good soak too free them up.Chock the front wheels, as the work needs to be done with the handbrake off.Remove the rear wheel,and rear caliper,you'll see a small flush fitting screw in the brake disc,remove this,you might have two opposite each other,but i had one on mine.Now have a lump hammer and strike the centre hub of the disk while using the other hand to prize it off,you'll have to be quite assertive with the hammer,as long as you don't hit the diisc surface,or the outside of the disc you'll be fine.Don't be scared of it.On removal of the disc you'll see the abs sensor.Mine had a 5mm Allen bolt holding it on.Now if your doin the side near the exhaust system.ie.rear passenger side,you'll notice where the sensor housing is bolted to the hub,it'll probably be all rusted and bubbling.This causes the sensor to pull away,and it doesn't pick up the magnet behind the wheel bearing.This is normally the fault,and not the actuall sensor itself.Clear away the bubbling with a screw driver.Refit the sensor, and you will see it sits much closer to the magnet now.Refit thedisk,calliper and wheel.Disconnect the battery for 20 mins to clear the fault on the dash,if you'r unlucky you'll have to go to a diagnostic too have the warning light cleared off the dash..
You can also access the sensor by lining the wheel nut hole to the sensor and put a long reach 5mm Allen key through to the bolt.
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