Do brake master cylinder replacement problems track solo operators as a share of all auto repair businesses across states?
Brake master cylinder replacement complaints run higher where solo operators is higherNHTSA owner complaints about brake master cylinder replacement run 24% above what the makes sold there would predict in the 10 states with the highest solo operators, and 4% below in the 10 with the lowest.
What it shows: States with more solo operators as a share of all auto repair businesses tend to sit higher on the chart across 32 states: a pattern in the data, not proof of cause.
Data: Census Nonemployer Statistics 2021 and County Business Patterns 2023, NAICS 8111, joined to NHTSA owner complaints, downloaded 2026-10-12 · 32 states. Chart: CalcScrape · calcscrape.com
A moderate pattern, probably real but not certain: about 1 in 6 patterns this clear turn out to be false alarms. Weak spot: hold very hot days equal and the solo operators pattern disappears, so it may be mostly that factor.