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The spongy brake pedal feeling with M Perf brakes is coming from people who mechnically install the kit but do not code the car. I installed my own M Perf kit and drove the car post-install but pre-code, and the pedal definitely felt "off". Too much travel, smooshy. Coded the car and it firmed up to stock/original feeling. This was with stoptech stainless lines installed.
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2015 BSM 328i Sport Line - BSM
2015 BSM X1 M Sport - BSM
1992 525i
1987 325e
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