Well, in a weird twist, there is a excellent troubleshooting video on YT that just appeared yesterday addressing this exact issue.
Bottom line - it is a internal failure of the ABS module that causes these symptoms.
Not the master cylinder, not electronics, but mechanical sticking / failure of the valves in the module. It seems like it should be the master cylinder, but it is not.
There are also Ford videos (I saw one for a E-150 van) that discuss the same failure, but the ABS module is slightly different. Same failure, sticking of the valves in the module.
This one has the same ABS module as my 2009 CX9
see - Pine Hollow Auto Diagnostics - Mazda 3 Dangerous Brakes
Bottom line - it is a internal failure of the ABS module that causes these symptoms.
Not the master cylinder, not electronics, but mechanical sticking / failure of the valves in the module. It seems like it should be the master cylinder, but it is not.
There are also Ford videos (I saw one for a E-150 van) that discuss the same failure, but the ABS module is slightly different. Same failure, sticking of the valves in the module.
This one has the same ABS module as my 2009 CX9
see - Pine Hollow Auto Diagnostics - Mazda 3 Dangerous Brakes
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