Do parking brake repair problems track median household income across states?
Parking brake repair complaints run higher where median household income is higherNHTSA owner complaints about parking brake repair run 9% above what the makes sold there would predict in the 10 states with the highest median household income, and 5% below in the 10 with the lowest.
What it shows: States with more median household income (dollars) tend to sit higher on the chart across 42 states: a pattern in the data, not proof of cause.
Data: U.S. Census Bureau, American Community Survey 5-year 2019-2023 (B19013), joined to NHTSA owner complaints, downloaded 2026-10-12 · 42 states. Chart: CalcScrape · calcscrape.com
A moderate pattern, probably real but not certain: about 1 in 8 patterns this clear turn out to be false alarms. Weak spot: hold cost of living index equal and the median household income pattern disappears, so it may be mostly that factor.