i managed to pull out that thing and i can torn rubber seal. went to the parts dealer to raplace the seal. and they said it is not an ae101 stock diskbrake, which means the seal is way too big compare to what in my car now (the previous owner might have modified it from other model

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my question is, do u guys know (based on the serial number from pics) what car is it from?website? tq.
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dual piston from RFDisk
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torn seal

this is what happened when u leave ur car for a few days (in Malaysia) Raddman said use C-clamp