I for the life of me couldn't make the rear piston to retract enough to allow for the new pads.
I did retract the parking brake by applying 12 volts to the pins, and even after prying the pads apart for a while I still need a couple of millimeters.
I don't have a brake tool so I was just trying them apart with whatever I had.
Had to put the old brake pads back in so I can get the right tool.
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My previous car (BMW X3) also had electric parking brakes, and your description sounds like exactly the way I did the rear brakes on that car. It'll be a while before the Macan needs brakes, but when it does I plan to follow your method. It makes sense that devices like these would self-calibrate in use.35K since manual retraction of rear brakes.
Everything works perfectly
Granted there's a good chance sensors can be reused, but I have had even rubber ones just fall apart when removed. Given that the sensors cost so little, I always makes sure I have spares handy before starting a brake job. Nothing worse than having to go hunting for parts in the middle of a job when it could have been so easily avoided, or having to go back and raise the car and remove the wheel once a replacement can be obtained.Great write up. Speaking of living on the edge:
Another myth (in many cases) is the need to replace the brake sensors. Let's get real, it's not a "sensor" like some kind of all knowing electronic eye and you proactively replace it because "OMG what if it fails?". It's a piece of wire buried in bits of rubber or plastic. It is situated so that when the pad wears to a certain level the edge of the rotor (aka "brake disc") cuts the wire. Once cut through you get an indication on your dash. That sensor needs to be replaced. If the others aren't cut yet then replacing them is a waste of money. Repeat: waste of money.
Rubber or plastic
So that's the deal. Any car I've owned with brake sensors up to and including my Boxster they were rubber, and the rubber was aging nicely. With my Cayenne I confidently did not purchase sensors because I had not yet met with plastic ones, which of course cracked when I pried them out. Worst case if I'm full of crap and your sensor fails a week later - it's a five minute job made easy with removal of a wheel. Curious if the Macan sensors are rubber, or if there are different types.
History lesson and why sensors are dumb
"Back in the day" brake pads used to have a thin metal tab with a bent edge. When the pad wore to, oh the same place the sensor is situated now, the very edge of the bent tab would begin to ride on the rusty inner part of the brake rotor (not where the pad passed over). It sounded terrible and was quite embarrassing to drive a car that way. Even a deaf, broke-a** grandmother would take her car in for service.
Convince me that wiring and sensors are an improvement on that, I'll wait right here.
It would make a tiny bit of sense if it told me which brake pad it was but it doesn't. 20 years ago my BMW had one sensor in a front brake and a second one in the opposite rear corner. The Porsche has one in each pad, but with the Cayenne plugged into Durametric it won't even tell you if it's front or back. I could have gotten better information from a squealing brake.