Enter the vehicle weight and the brake force each wheel showed on the roller tester, and get the service-brake efficiency and per-axle imbalance the tester will compute — before the test does.
Efficiency = total brake force ÷ vehicle weight force × 100, with weight force m·g (g = 9.81 m/s²) and forces converted to newtons (1 daN = 10 N, 1 kgf = 9.80665 N). Imbalance per axle = |left − right| ÷ the higher side × 100. Default thresholds follow common EU periodic-test practice (service ≥ 50%, parking ≥ 16%, imbalance ≤ 30% on a steered axle) — edit them to your jurisdiction and vehicle class; requirements differ by country, class and first-registration date.
Pre-check aid. The official result is the test lane's, measured at the test weight on the day.