NHTSA owner complaints about this part run furthest above the usual seasonal share in August: about 66% more of them name an incident that month than complaints about any part would predict. A complaint is a report, not a measured failure.
What it shows: August is the largest at 15% (all: 9%), followed by January at 5% (all: 9%); the smallest shown is November at 4% (all: 7%).
Data and chart by CalcScrape: Brake Master Cylinder Replacement Cost Calculator