On my '04 S80 2.9, the left rear wheel locks up on activation of the ABS, but I do not get an ABS indicator light. The other three wheels, including the right rear, function properly. Any speculation as to what may be the cause and the remedy? Thanks.

 

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can be one of two things - air in the brake lines - you may have a leaky caliper, leaky ABS valve body so look around or a stuck valve in the ABS. You'd need to put a pressure gauge on the brake line / port to see if you are getting the correct pressure to all four wheels.