MOT failure · RFR #30009
Service brake efficiency less than 50% of the required value
Total
1
Models
1
Models most at risk.
Ranked by rate, not raw volume. A Fiesta shows every failure a lot because there are a lot of Fiestas. Rate = share of that model's own MOTs.
Failure match · your reg
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Cost orientation
Hard to predict in isolation — depends what's actually worn.
This defect doesn't map to a clean retail-part swap; ranges vary too widely without seeing the car. Use the estimator to bracket the all-in cost across the items most likely to surface alongside it.
Frequently asked.
- Why does service brake efficiency less than 50%… fail an MOT?
- Service brake efficiency less than 50% of the required value. Most commonly flagged on the Mercedes Benz Evito Progressive. UK MOT standards require this item to meet minimum safety thresholds — when it falls short, the tester logs it as a Major or Dangerous defect and the car fails outright.
- How much does it cost to fix service brake efficiency less than 50%…?
- Costs vary depending on the vehicle, region, and severity. Use our MOT cost estimator for typical UK garage rates across the most common failure items.
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