07-14-2022, 06:17 PM | #1 |
ex-Porsche Guy
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Active Tourer Front Rotor Replacement
My 2018(??) 218D recently displayed the brake pad warning at 45K km/28K miles. Took it to the dealer here in Japan. Replaced the rear pads, said the front were likely okay until inspection in about 6 months. Thing is, they mentioned the estimated cost at about $1K if the rotors had to be replaced.
Replace the rotors? And the brakes are okay? This is my first BMW but that sounds weird. Maybe turning them, I can see. The wife took it in, and she was talking about replacing the front discs (try telling HER that they are called ‘rotors’) so there could be a misunderstanding. I’m going to pull the wheels and take a look. I’ve tried to find minimum rotor thickness for the F45 but no luck yet. Comments or suggestions? |
07-14-2022, 07:44 PM | #2 |
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That seems like very low mileage for brake replacements but I guess if you constantly ride the brakes that will happen...
The minimum thickness of the should be stamped on the "hat" of the rotor. https://www.pelicanparts.com/techart...n_Checking.htm Disregard that the link is for a different model, brakes are brakes. |
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07-14-2022, 08:27 PM | #3 | |
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Driving in Japan my foot is often near/on the brake pedal, though not actively riding the brakes. I just don’t trust mechanics, especially ones talking to a Japanese woman that believes everybody has the best intentions. |
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07-14-2022, 11:19 PM | #4 |
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45,000km for front brake replacement with lots of city and back road driving is not unusual. There is a possibility the rotors will wear before the pads, but this is not normally the case. BMW also has 2 wear limits on the rotors - the limit above which new pads can be fitted (stamped on the rotor, typically 1.6mm wear, so for example 22.4mm for a 24.0mm thick rotor when new) and the absolute limit where the rotor has to be replaced (typically 2.4mm total wear, so 21.6mm thickness for a 24.0mm rotor when new).
The absolute limit is in the BMW ISTA maintenance documentation in the attachment and seems to be the typical 2.4mm for a 2017 F45 218d. |
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07-14-2022, 11:37 PM | #5 | |
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