Service advised me to replace my brakes pads because they were "at 10% and the rotors are right at minimum spec". The math did not add up: I dropped the vehicle off with no brake pad wear sensor light requesting brake service, the sensors find themselves 4.5 mm (a $4 dollar replaceable sensor ) into the brake material from the metal backing for brake pad whose when new dimension is 13.5mm of brake material, so at point when the brake pad sensor light calls for service, 29.6% of brake pads is left, to date I do not have a brake service light and it has been 3 weeks. They also told me that the rotors are right at minimum spec, a machined notch in the venting that corresponds to this minimum. I was nowhere near my wear limit. The reason my vehicle went in for service to begin with was the airmatic system service required popped up on the dash and the vehicle suspension was riding abnormally. Josh informed me it was " due to compressor running and burning up the connectors ". when I asked what caused it to run excessively ( online research pointed me to a leak in the suspension system ) he said it was "likely an internal malfunction in the unit" intentionally being vague as to what he meant by unit. I asked if the leak had been found and requested inspection of old parts, Josh texts back the next day that he was not able to get the old parts back before the tech turned it back for warranty, and also informed me that unless I want other repairs he advised the car was ready for pickup. After insisting something would have caused the compressor and a connector to burn Josh told me a relay was sticking and causing the motor to run until it failed. At this point I am thinking could an engineer have designed in a relay that could not have been able to handle the inductive load, and the wire connectors was inadequate as well? Being an electronic engineer I would have expected a fuse to open to prevent physically damaging the system as Josh was describing. I asked If I could speak with the tech to which I was told yes and given times. When I came to pick the vehicle up I was told the tech was not there nor was Josh. Online forums everywhere pretty much say that relays go bad in the open sense, and the compressor In my vehicle did not look new. One of the other issues that was supposedly remedied was windows opening up immediately after they were closed by a user: Mercedes Benz of Chicago replaced the driver side control months before, Schumacher did the same but intermittently we have issues. After picking up the car I also noticed that TPMS was telling me all my tires were inflated to 40 PSI. the door jamb specifies 32 psi for front and 38 for rear inflation pressures, over inflating fronts by 25%. I asked to meet with Josh's manager. When I met Aurel Bobesku he pulled the shop forman into the meeting, Over the phone I was told we would look at the brakes and try to see where the 10 percent number came from but that never happened. The shop foreman had a spiel and answer for everything, The airmatic compressor was killed by a faulty relay, when I told him I have seen relays fail open but never in a closed state he said it happens all the time. When asked why the compressor does not look new, I was told remanufactured compressors are used. I asked why 40 PSI and not the door jamb specifications? He said the shop goes by the sticker on the inside of the gas filling door (later I checked and found that the gas filling door sticker shows 32 front 38 rear just like the door jamb). I wonder how the airmatic system was calibrated for riding height with my tires being over inflated, do I now have to maintain 40 PSI over inflated tires for my airmatic system to operate correctly? No one at Schumacher could explain how they determined the Auxiliary battery required replacement but the service advisor told me I needed to replace both batteries and other things I did not go in to see them for in order to have them look at what was causing issues.