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[Marks DTM Calib]

quote]

Check the ABS reluctance rings on the CV joints for damage/cracks

will do in a few weeks as the car is not with me at the moment.  Can I ask what the thinking is here?  is it that if the rings are damaged/cracked the ABS may be getting a slightly incorrect signal?

Correct, for the rings to work correectly they need to be a full circle....if cracked then the ABS sees a slower signal on that wheel and applies the braking.

[jonathanh]

Many thanks Mark - incredibly useful.  This does seem like a possible cause to me, particularly as it happens usually when the steering is turned (differential speed between the wheels anyway) 

if it is the rings, I don't want to guess the cost of new rings - anything with toyota is an arm and a leg.....  scrappie job

[jonathanh]

well I've now checked the reluctor rings - they are all clean and not broken.  however I may have discovered the problem.  the front has 2 new ish tyres, the back has 2 older ones, one down to the wear markers and the other about 40-50% worn.

would this be causing the ABS to trigger at slow speed?