Hey everyone, I posted a similar question about a year ago but thought I'd ask again since the problem hasn't been fixed. I did a rear brake job on my wife's 2016 CX9. I put the brakes into maintenance mode, replaced the pads, and took it out of maintenance mode. All works great AS LONG AS CAR IS OFF. Once you turn on the car, only one side of the e-brake will engage. The dealer wanted about $2100 to replace everything. I suspect it's a sensor but don't know how many are back there. Would it be just as easy to replace the electronic parking brake module? Thanks again for any suggestions!

 

I changed pads and took it out of maintenance mode. If i engage the parking brake then turn off car wait 20 seconds and then start it and disengage parking brake, it works, both rear parking brakes engaged and disengaged and both parking brake light are out. NOW, if you have the engine running and engage parking brake and then disengage it, brake light starts flashing as well as the light on the button. Both brakes are disengaged. When i engage them again, only the driverside rear is engaged and lights still flashing. I disengage the parking brakes and it releases but light still flash. I can replicate this everytime. Downside is you cannot use your cruise control if these lights are still blinking. I shut the car off, wait 20-30 seconds and the lights will go out and your back to normal.

 

I would turn on the car then take it out of maintenance mode again and then shut the car off and wait 30 seconds. Then start the engine and see if that shuts off the lights. Or try what i did and see if you can replicate the same thing i did.