CBS: "Can't live with you, Can't live without you!"
I have documented the funny ways of CBS many times before in this thread. CBS has a habit of throwing nasty surprises with sudden service alerts just when you are planning a long drive. CBS strictly follows Murhpy's Law! Some of my CBS experiences in this thread are quoted below:
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Originally Posted by Dr.AD Condition Based Servicing (CBS) is BMW's way of doing car maintenance. With my experiences so far, I am not a fan of CBS for sure. But more on that later. |
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Originally Posted by Dr.AD After the monsoon drive through Chikmagalur (described in earlier posts in this thread), the oil change requirement in CBS dropped to 800km. I had one more drive planned after that, to Thanjavur, and given the nice fast roads in that drive, I wanted to take my 320d there. That was another 800km to 900km drive, and unfortunately it was way too close to remaining oil life of 800km. |
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Originally Posted by Dr.AD The front and rear brake pads both had more than 15,000km of life left, according to CBS. However, when I reached Ankola and stopped for a coffee break, and then restarted the car, the message popped up that next service due was in 2,100km! Surprised and alarmed by this, I checked the details, and it was the rear brake pads! |
However, this time, I had a different kind of CBS problem. The one that I had never faced before.
It had been a long time since there was no CBS alert. It felt too good to be true. CBS was suddenly behaving like a good boy, and that made me worry.
It was almost like I was missing the usual CBS alerts. Stockholm Syndrome!
Something was wrong and I had to get it checked! To be specific, I did oil change about 6 months ago, and since then I drove the BMW only for about 6000km (my Thar did major driving in last six months due to a variety of reasons), and therefore, no oil change is due for another 6 months. So that is fine.
But what about brake pads? CBS loves to show brake pads replacement alerts most often, and when you least expect those. But this time there was no brake pads change alert in a long time too, something which I interpreted as suspicious. Front brake pads were replaced about 10,000km ago and they surely have good life left. However, it had been a while since I replaced rear brake pads.
About 2 months ago, when I checked the service requirement details (I have a habit of going through this checklist in the iDrive from time to time, just for curiosity and fun), the rear brake pads life was down to 5,000km, which was expected.
However, what was not expected was that it stayed at 5,000km since then! Typically, my experience is that once the brake pads life goes down to 5,000km, then it rapidly (non-linearly) decreases after that. 5,000 to 2,000 to 1,000 to 500, it all happen rapidly.
However, this time, even after driving 2,000km or maybe 3,000km more, the rear brake pads life was still stuck on exactly 5,000km. In fact, I don't remember exactly when I checked last, but it felt like an eternity that rear brake pads life was at 5,000km.
Rear brake pads life at 5,000km since long:
I checked my service history (another menu in iDrive) and realized that it had been about 27,000km since I changed rear brake pads. Now that is the max brake pads life one can expect in a BMW. In my own experience, I am getting around 18,000km to 20,000km on a set of brake pads on average, and only once in the past I got a life of about 27,000km on rear brake pads.
So this time, I was sure that I am nearing the end of the rear brake pads life but somehow the CBS is not showing it. My instinct was that it was CBS that was messing up with me again.
Therefore, I decided to visit the service center and check it. I did take a quick look at home and it looked like there was still some life left in brake pads, but I wanted to verify at the service center.
I visited my usual place, KUN BMW Service Center (previously Navnit BMW), and as always, I got a great service experience there. My Service Advisor checked the brake pads and told me I can drive about 500km more. That meant almost end of the life. Then, why did CBS did not show it?
Well, they jacked up the car and removed wheels and brake pads to inspect, and turns out the pads were indeed down to about 4mm thickness (3mm is when they must be changed immediately). And the reason we assumed the CBS sensor did not trigger is because it was covered in a lot of mud and dust. The brake pad sensors, just like the wheel speed sensors (aka the ABS sensors) are known to misbehave due to dust, so I took that reason as a fair explanation. Anyways, there was nothing else I could do.
Old brake pads, worn out and the sensor covered in dust:
Thankfully, the parts were in stock and I changed the brake pads and the sensor (the "repair kit" as they call it includes brake pads and the new sensor and a few other small components) immediately there.
As always, fantastic service at KUN BMW. They attended to my car promptly, checked everything in front of me, replaced the brake pads quickly, washed the car too, and handed over the washed car to me, with new brake pads installed, in a reasonably quick time. They were polite, friendly and supportive the whole time.
I would rate my BMW service experience as 10/10 once again!
The total bill for brake pads change (parts plus labor) came to about ₹22,000, which is par for the course and par with my past experiences.
With the new brake pads, now everything is fine and the car is ready for another couple of long drives.
All fine and ready for next long drive:
In summary, CBS did throw a googly at me this time, but I am glad that I proactively checked for the brake pads wear and got the brake pads replaced at the right time, without waiting for CBS alerts. Sometimes the human intuitions can be more accurate than the sensor readings, and this was one of those cases.
Anyways, so that is the story this time. Thank you for reading!