90%
Mercedes-Benz GLB pass rate
Used Mercedes-Benz GLB buying guide
In 2025, Mercedes-Benz GLB cars passed 90% of 12,352 initial MOT tests, 17.7 points above the 72.3% UK average. Here is where it fails and what to check before you buy.
Looking at a specific GLB? Check its finance, write-off, stolen, mileage and keeper history. £15, no account needed.
Mercedes-Benz GLB MOT record in brief
Initial MOT tests in 2025, retests excluded.
72.3%
UK average, all cars
+17.7
percentage points above average
Ranked on pass rate the GLB sits 41st of 575 models in the data. Mercedes-Benz as a brand averaged 77.1%, so this model runs 12.9 points ahead of its own brand.
A pass rate is not a reliability score. The full Mercedes-Benz GLB MOT record has the pass rate by age, every common failure and how the GLB compares with similar cars.
GLB fuel types
Petrol was the most common fuel among Mercedes-Benz GLB cars tested in 2025. Diesel still made up 39.6% of tests.
Where the GLB fails its MOT
Where Mercedes-Benz GLB cars that failed their 2025 MOT were marked down, as a share of all recorded failure items.
The specific items testers recorded most often were condition has a cut in excess of the requirements deep enough to reach the ply or cords (20.3%), brake pads less than 1.5 mm thick (9.3%) and condition has ply or cords exposed (8.2%). See every common GLB MOT failure.
These are DVSA failure records across every Mercedes-Benz GLB that failed, not a claim that every GLB has these problems.
What should you check when buying a used GLB?
The areas above, most common first, and what an MOT tester looks at in each.
1
Tyres
Check tread depth across the full width of every tyre (the legal minimum is 1.6mm), and look for cuts, bulges and uneven wear. 42.1% of GLB failure items.
2
Brakes
Make sure the pedal feels firm, the car stops in a straight line, the handbrake holds on a slope and no brake warning light is showing. 17.6% of GLB failure items.
3
Lamps, reflectors and electrical equipment
Walk round with every light on: headlights, brake lights, indicators, fog lights and the number plate lamp. Check no warning lights stay on after starting. 14.8% of GLB failure items.
4
Visibility
Check the windscreen for chips or cracks in the driver's view, and that the wipers and washers clear it properly. 9.6% of GLB failure items.
5
Suspension
Listen for knocks over bumps, check the car sits level, and look for leaking shock absorbers and split rubber gaiters. 4.3% of GLB failure items.
None of this replaces the car's own record. Run a free MOT history check on the registration to see every test, advisory and recorded mileage for that car.
What the MOT record doesn't tell you
Knowing Mercedes-Benz GLB failures cluster around tyres and brakes tells you what to inspect. It tells you nothing about whether the car is safe to buy. An MOT does not show money still owed on the car, a write-off, a theft record or a clocked odometer.
Check the exact GLB you are looking at. One £15 report, instant results, backed by a £30,000 data guarantee. More on the Mercedes-Benz history check.
- Outstanding finance
- Write-off records
- Stolen markers
- Mileage history
- Previous keepers
Other used Mercedes-Benz models
The most-tested Mercedes-Benz models in 2025, with how their MOT pass rate compares with the GLB.
- Used Mercedes-Benz A-Class 78.4% MOT pass rate
- Used Mercedes-Benz C-Class 74.7% MOT pass rate
- Used Mercedes-Benz E-Class 77.4% MOT pass rate
- Used Mercedes-Benz GLA 83.3% MOT pass rate
- Used Mercedes-Benz Vito 67.3% MOT pass rate
- Used Mercedes-Benz GLC 86.4% MOT pass rate
See all 35 Mercedes-Benz models ranked by MOT pass rate.
Used Mercedes-Benz GLB FAQs
Is the Mercedes-Benz GLB reliable?
MOT data does not measure reliability. It records whether a car met the roadworthiness standard on the day of its test. What it does show is a 90% first-time pass rate for the Mercedes-Benz GLB across 12,352 tests in 2025, above the 72.3% average for all cars.
What should I check before buying a used Mercedes-Benz GLB?
On the car itself, start with the areas it most often fails on: tyres, brakes and lamps, reflectors and electrical equipment. Then check the individual car's history: outstanding finance, insurance write-off records, stolen markers, mileage and previous keepers. None of these appear in the MOT record or on the V5C.
How do I check a Mercedes-Benz GLB's history?
Enter the registration of the specific car. A Carpeep car history check reports outstanding finance, write-off category, stolen markers, mileage history, previous keepers, MOT and tax status, import and export markers and scrapped status in one £15 report.
MOT figures are aggregated from the DVSA MOT Anonymised data set for 2025 (class 4 initial tests, retests excluded), licensed under the Open Government Licence v3.0. MOT results describe roadworthiness at test, not mechanical reliability.