MOT failure · RFR #32129
Brake performance unable to be tested
Total
63
Models
10
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.
- 01 Tesla Model X Long Range Awd 0.54%
- 02 Honda Gl1500 0.50%
- 03 Vauxhall G Land X Bsns ED NV Prm Hyb4 A 0.41%
- 04 Kia Proceed GT Line Isg 0.35%
- 05 Volvo Xc90 R Design B5 Mhev Awd Auto 0.31%
- 06 Volvo Xc60 Edition T4 Auto 0.27%
- 07 Volvo V90 Momentum + T4 Auto 0.24%
- 08 Tesla Model 3 Long Range Awd 0.22%
- 09 Mitsubishi Eclipse Cross Exceed 4x4 Cvt 0.20%
- 10 Audi E Tron Technik 50 Quattro 0.11%
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.
Open estimator
Frequently asked.
- Why does brake performance unable to be tested fail an MOT?
- Brake performance unable to be tested. Most commonly flagged on the Tesla Model X Long Range Awd. The DVSA's 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 brake performance unable to be tested?
- 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.