My point exactly. To quote a famous saying "In theory, theory and practice are the same, in practice they aren't"Kowalski wrote:"Should" and "Could" are two entirely different words.
In theory, the ABS system should failsafe, in practice it doesn't always.
I've had that happen as well as the complete half second failure of brakes at very low speed.I've had my ABS do slightly odd things when I had a dodgy cable on an ABS sensor. In my case, the ABS would occasionally cut in when it shouldn't BUT it only affected the circuit that had the dodgy sensor, i.e. the rest of the brakes worked properly BUT I did have to press the pedal harder.
You are quite right about this - a flat accumulator sphere is highly likely to impact on the effective operation of ABS.I have a theory that a flat accumulator sphere could cause problems in combination with the ABS, but I don't know how the ABS system interupts the brakes and whether it needs additional pressure to operate. Somebody who understands the mechanics of the ABS valve block could no doubt rule out or confirm this theory as plausable or not.
Since ABS works by releasing and re-applying the brakes several times a second, it does somewhat rely on the intantaneous stored pressure provided by the accumulator sphere.
The result could be the brakes being mostly released for a second or so until the pump cuts back in to bring the pressure up, rather than pulsing on and off rapidly. So when the ABS *did* trigger, it wouldn't work very effectively.
However with the problem being discussed the fact is the ABS should not be activating under any circumstances for light braking below the threshold speed. (Of approx 20Km/hr)
Regards,
Simon