My ABS light has been coming on and going off at random time while driving. Once it comes on it stays on till the next time the car is started and the system does it's test at 12 to 15 mph. Then it goes off after the test... and it might not come on for several days. Anyway the Volvo place tested the code and it was a 3/4, they said that was the right rear wheel sensor. Fine, that's easy to replace. I haven't got the part yet, am waiting...
The WEIRD thing is this... lately (sometimes) when stopping the car the brake pedal will feel solid with the car slowing down nicely... but at about 15mph during the slowdown the brake pedal will all of the sudden give an extra 1/2 inch or so down. Not exactly 'mushy' but real weird. The ABS light will come on at the exact second this happens. (as opposed to the random times indicated above.) After this 'slip' in the pedal the car stops fine. And one time, and only one time, the brake pedal gave it's little 1/2 inch extra at a stop sign and there was a growling sound from near the brake pedal and I could feel the grinding/growling sound in the pedal as a vibration. That seems to not be related to a RR wheel sensor!!
Any ideas, appreciated!
Just so you'll know... the battery/alternator system is 100% and my tires are at the right inflation.