Statistical data set
Top 10 reasons for heavy goods vehicle (HGV) trailer fails
Updated 28 March 2024
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| Financial year | Period | Testable item | Percentage |
|---|---|---|---|
| 2023 to 2024 | Quarter 3: October to December | Brake Systems and Components | 4.70% |
| 2023 to 2024 | Quarter 3: October to December | Service Brake Performance | 3.33% |
| 2023 to 2024 | Quarter 3: October to December | Parking Brake Performance | 2.20% |
| 2023 to 2024 | Quarter 3: October to December | Lamps | 1.70% |
| 2023 to 2024 | Quarter 3: October to December | Markers and Reflectors | 1.00% |
| 2023 to 2024 | Quarter 3: October to December | Suspension | 0.79% |
| 2023 to 2024 | Quarter 3: October to December | Condition of Tyres | 0.49% |
| 2023 to 2024 | Quarter 3: October to December | Spray Suppression, Wings and Wheel Arches | 0.42% |
| 2023 to 2024 | Quarter 3: October to December | Electrical Wiring and Equipment | 0.22% |
| 2023 to 2024 | Quarter 3: October to December | Sideguards, Rear Under-Run Devices & Bumper Bars | 0.20% |
| 2023 to 2024 | Quarter 2: July to September | Brake Systems and Components | 4.19% |
| 2023 to 2024 | Quarter 2: July to September | Service Brake Performance | 2.86% |
| 2023 to 2024 | Quarter 2: July to September | Parking Brake Performance | 2.13% |
| 2023 to 2024 | Quarter 2: July to September | Lamps | 1.62% |
| 2023 to 2024 | Quarter 2: July to September | Markers and Reflectors | 0.95% |
| 2023 to 2024 | Quarter 2: July to September | Suspension | 0.73% |
| 2023 to 2024 | Quarter 2: July to September | Condition of Tyres | 0.50% |
| 2023 to 2024 | Quarter 2: July to September | Spray Suppression, Wings and Wheel Arches | 0.35% |
| 2023 to 2024 | Quarter 2: July to September | Sideguards, Rear Under-Run Devices & Bumper Bars | 0.18% |
| 2023 to 2024 | Quarter 2: July to September | Electrical Wiring and Equipment | 0.18% |
| 2023 to 2024 | Quarter 1: April to June | Brake Systems and Components | 4.74% |
| 2023 to 2024 | Quarter 1: April to June | Service Brake Performance | 3.18% |
| 2023 to 2024 | Quarter 1: April to June | Parking Brake Performance | 2.37% |
| 2023 to 2024 | Quarter 1: April to June | Lamps | 1.82% |
| 2023 to 2024 | Quarter 1: April to June | Markers and Reflectors | 1.05% |
| 2023 to 2024 | Quarter 1: April to June | Suspension | 0.77% |
| 2023 to 2024 | Quarter 1: April to June | Condition of Tyres | 0.55% |
| 2023 to 2024 | Quarter 1: April to June | Spray Suppression, Wings and Wheel Arches | 0.42% |
| 2023 to 2024 | Quarter 1: April to June | Sideguards, Rear Under-Run Devices & Bumper Bars | 0.17% |
| 2023 to 2024 | Quarter 1: April to June | Electrical Wiring and Equipment | 0.17% |
| 2022 to 2023 | Quarter 4: January to March | Service Brake Performance | 3.70% |
| 2022 to 2023 | Quarter 4: January to March | Brake Systems and Components | 2.35% |
| 2022 to 2023 | Quarter 4: January to March | Parking Brake Performance | 2.29% |
| 2022 to 2023 | Quarter 4: January to March | Lamps | 1.56% |
| 2022 to 2023 | Quarter 4: January to March | Suspension | 0.82% |
| 2022 to 2023 | Quarter 4: January to March | Condition of Tyres | 0.51% |
| 2022 to 2023 | Quarter 4: January to March | Markers and Reflectors | 0.41% |
| 2022 to 2023 | Quarter 4: January to March | Spray Suppression, Wings etc | 0.32% |
| 2022 to 2023 | Quarter 4: January to March | Rear Markings and Reflectors | 0.30% |
| 2022 to 2023 | Quarter 4: January to March | Condition of Chassis | 0.15% |
| 2022 to 2023 | Quarter 3: October to December | Service Brake Performance | 3.28% |
| 2022 to 2023 | Quarter 3: October to December | Parking Brake Performance | 2.07% |
| 2022 to 2023 | Quarter 3: October to December | Brake Systems and Components | 1.46% |
| 2022 to 2023 | Quarter 3: October to December | Lamps | 1.23% |
| 2022 to 2023 | Quarter 3: October to December | Suspension | 0.92% |
| 2022 to 2023 | Quarter 3: October to December | Rear Markings and Reflectors | 0.53% |
| 2022 to 2023 | Quarter 3: October to December | Spray Suppression, Wings etc | 0.48% |
| 2022 to 2023 | Quarter 3: October to December | Condition of Tyres | 0.39% |
| 2022 to 2023 | Quarter 3: October to December | Sideguards,Under Run & Bumpers | 0.22% |
| 2022 to 2023 | Quarter 3: October to December | Road Wheels and Hubs | 0.18% |
| 2022 to 2023 | Quarter 2: July to September | Service Brake Performance | 2.75% |
| 2022 to 2023 | Quarter 2: July to September | Parking Brake Performance | 2.06% |
| 2022 to 2023 | Quarter 2: July to September | Brake Systems and Components | 1.37% |
| 2022 to 2023 | Quarter 2: July to September | Lamps | 1.05% |
| 2022 to 2023 | Quarter 2: July to September | Suspension | 0.78% |
| 2022 to 2023 | Quarter 2: July to September | Rear Markings and Reflectors | 0.44% |
| 2022 to 2023 | Quarter 2: July to September | Condition of Tyres | 0.42% |
| 2022 to 2023 | Quarter 2: July to September | Spray Suppression, Wings etc | 0.40% |
| 2022 to 2023 | Quarter 2: July to September | Sideguards,Under Run & Bumpers | 0.19% |
| 2022 to 2023 | Quarter 2: July to September | Condition of Chassis | 0.16% |
| 2022 to 2023 | Quarter 1: April to June | Service Brake Performance | 2.95% |
| 2022 to 2023 | Quarter 1: April to June | Parking Brake Performance | 2.27% |
| 2022 to 2023 | Quarter 1: April to June | Lamps | 1.18% |
| 2022 to 2023 | Quarter 1: April to June | Brake Systems and Components | 1.17% |
| 2022 to 2023 | Quarter 1: April to June | Suspension | 0.77% |
| 2022 to 2023 | Quarter 1: April to June | Condition of Tyres | 0.45% |
| 2022 to 2023 | Quarter 1: April to June | Rear Markings and Reflectors | 0.43% |
| 2022 to 2023 | Quarter 1: April to June | Spray Suppression, Wings etc | 0.41% |
| 2022 to 2023 | Quarter 1: April to June | Road Wheels and Hubs | 0.18% |
| 2022 to 2023 | Quarter 1: April to June | Sideguards,Under Run & Bumpers | 0.17% |
| 2021 to 2022 | Quarter 4: January to March | Service Brake Performance | 4.21% |
| 2021 to 2022 | Quarter 4: January to March | Brake Systems and Components | 3.48% |
| 2021 to 2022 | Quarter 4: January to March | Parking Brake Performance | 2.78% |
| 2021 to 2022 | Quarter 4: January to March | Condition of Tyres | 2.70% |
| 2021 to 2022 | Quarter 4: January to March | Suspension | 2.55% |
| 2021 to 2022 | Quarter 4: January to March | Condition of Chassis | 2.22% |
| 2021 to 2022 | Quarter 4: January to March | Lamps | 1.76% |
| 2021 to 2022 | Quarter 4: January to March | Spray Suppression, Wings etc | 1.24% |
| 2021 to 2022 | Quarter 4: January to March | Rear Markings and Reflectors | 0.86% |
| 2021 to 2022 | Quarter 4: January to March | Sideguards,Under Run & Bumpers | 0.75% |
| 2021 to 2022 | Quarter 3: October to December | Service Brake Performance | 5.02% |
| 2021 to 2022 | Quarter 3: October to December | Parking Brake Performance | 3.43% |
| 2021 to 2022 | Quarter 3: October to December | Brake Systems and Components | 2.75% |
| 2021 to 2022 | Quarter 3: October to December | Lamps | 2.06% |
| 2021 to 2022 | Quarter 3: October to December | Suspension | 2.02% |
| 2021 to 2022 | Quarter 3: October to December | Condition of Tyres | 1.23% |
| 2021 to 2022 | Quarter 3: October to December | Spray Suppression, Wings etc | 1.12% |
| 2021 to 2022 | Quarter 3: October to December | Rear Markings and Reflectors | 0.87% |
| 2021 to 2022 | Quarter 3: October to December | Condition of Chassis | 0.84% |
| 2021 to 2022 | Quarter 3: October to December | Sideguards,Under Run & Bumpers | 0.45% |
| 2021 to 2022 | Quarter 2: July to September | Service Brake Performance | 4.11% |
| 2021 to 2022 | Quarter 2: July to September | Parking Brake Performance | 3.14% |
| 2021 to 2022 | Quarter 2: July to September | Condition of Tyres | 2.33% |
| 2021 to 2022 | Quarter 2: July to September | Brake System Components | 2.18% |
| 2021 to 2022 | Quarter 2: July to September | Lamps | 1.91% |
| 2021 to 2022 | Quarter 2: July to September | Suspension | 1.62% |
| 2021 to 2022 | Quarter 2: July to September | Spray suppression, wings / wheel arches | 0.94% |
| 2021 to 2022 | Quarter 2: July to September | Rear Markings and Reflectors | 0.68% |
| 2021 to 2022 | Quarter 2: July to September | Condition of Chassis | 0.65% |
| 2021 to 2022 | Quarter 2: July to September | Sideguards,Under Run & Bumpers | 0.36% |
| 2021 to 2022 | Quarter 1: April to June | Service Brake Performance | 4.11% |
| 2021 to 2022 | Quarter 1: April to June | Parking Brake Performance | 3.14% |
| 2021 to 2022 | Quarter 1: April to June | Condition of Tyres | 2.33% |
| 2021 to 2022 | Quarter 1: April to June | Brake System Components | 2.18% |
| 2021 to 2022 | Quarter 1: April to June | Lamps | 1.91% |
| 2021 to 2022 | Quarter 1: April to June | Suspension | 1.62% |
| 2021 to 2022 | Quarter 1: April to June | Spray suppression, wings / wheel arches | 0.94% |
| 2021 to 2022 | Quarter 1: April to June | Rear Markings and Reflectors | 0.68% |
| 2021 to 2022 | Quarter 1: April to June | Condition of Chassis | 0.65% |
| 2021 to 2022 | Quarter 1: April to June | Sideguards,Under Run & Bumpers | 0.36% |
| 2020 to 2021 | Quarter 4: January to March | Service Brake Performance | 5.07% |
| 2020 to 2021 | Quarter 4: January to March | Parking Brake Performance | 3.36% |
| 2020 to 2021 | Quarter 4: January to March | Brake Systems and Components | 2.19% |
| 2020 to 2021 | Quarter 4: January to March | Lamps | 1.97% |
| 2020 to 2021 | Quarter 4: January to March | Condition of Tyres | 1.90% |
| 2020 to 2021 | Quarter 4: January to March | Suspension | 1.62% |
| 2020 to 2021 | Quarter 4: January to March | Spray Suppression, Wings etc | 0.89% |
| 2020 to 2021 | Quarter 4: January to March | Rear Markings and Reflectors | 0.73% |
| 2020 to 2021 | Quarter 4: January to March | Condition of Chassis | 0.52% |
| 2020 to 2021 | Quarter 4: January to March | Sideguards,Under Run & Bumpers | 0.35% |
| 2020 to 2021 | Quarter 3: October to December | Service Brake Performance | 5.14% |
| 2020 to 2021 | Quarter 3: October to December | Parking Brake Performance | 3.12% |
| 2020 to 2021 | Quarter 3: October to December | Brake Systems and Components | 2.90% |
| 2020 to 2021 | Quarter 3: October to December | Suspension | 1.88% |
| 2020 to 2021 | Quarter 3: October to December | Lamps | 1.77% |
| 2020 to 2021 | Quarter 3: October to December | Spray Suppression, Wings etc | 0.96% |
| 2020 to 2021 | Quarter 3: October to December | Condition of Tyres | 0.94% |
| 2020 to 2021 | Quarter 3: October to December | Rear Markings and Reflectors | 0.74% |
| 2020 to 2021 | Quarter 3: October to December | Condition of Chassis | 0.67% |
| 2020 to 2021 | Quarter 3: October to December | Sideguards,Under Run & Bumpers | 0.39% |
| 2020 to 2021 | Quarter 2: July to September | Service Brake Performance | 4.51% |
| 2020 to 2021 | Quarter 2: July to September | Parking Brake Performance | 3.13% |
| 2020 to 2021 | Quarter 2: July to September | Brake Systems and Components | 2.39% |
| 2020 to 2021 | Quarter 2: July to September | Lamps | 1.71% |
| 2020 to 2021 | Quarter 2: July to September | Suspension | 1.50% |
| 2020 to 2021 | Quarter 2: July to September | Condition of Tyres | 0.94% |
| 2020 to 2021 | Quarter 2: July to September | Spray suppression, wings / wheel arches | 0.78% |
| 2020 to 2021 | Quarter 2: July to September | Rear Markings and Reflectors | 0.61% |
| 2020 to 2021 | Quarter 2: July to September | Condition of Chassis | 0.52% |
| 2020 to 2021 | Quarter 2: July to September | Sideguards,Under Run & Bumpers | 0.39% |
| 2020 to 2021 | Quarter 1: April to June | Service Brake Performance | 4.02% |
| 2020 to 2021 | Quarter 1: April to June | Brake Systems and Components | 2.28% |
| 2020 to 2021 | Quarter 1: April to June | Parking Brake Performance | 1.63% |
| 2020 to 2021 | Quarter 1: April to June | Spray Suppression, Wings etc | 0.65% |
| 2020 to 2021 | Quarter 1: April to June | Suspension | 0.65% |
| 2020 to 2021 | Quarter 1: April to June | Condition of Tyres | 0.54% |
| 2020 to 2021 | Quarter 1: April to June | Lamps | 0.54% |
| 2020 to 2021 | Quarter 1: April to June | Condition of Chassis | 0.43% |
| 2020 to 2021 | Quarter 1: April to June | Rear Markings and Reflectors | 0.33% |
| 2020 to 2021 | Quarter 1: April to June | Sideguards,Under Run & Bumpers | 0.22% |
| 2019 to 2020 | Quarter 4: January to March | Service Brake Performance | 4.20% |
| 2019 to 2020 | Quarter 4: January to March | Parking Brake Performance | 2.40% |
| 2019 to 2020 | Quarter 4: January to March | Brake Systems and Components | 2.10% |
| 2019 to 2020 | Quarter 4: January to March | Lamps | 1.80% |
| 2019 to 2020 | Quarter 4: January to March | Suspension | 1.40% |
| 2019 to 2020 | Quarter 4: January to March | Spray Suppression, Wings etc | 0.80% |
| 2019 to 2020 | Quarter 4: January to March | Condition of Tyres | 0.70% |
| 2019 to 2020 | Quarter 4: January to March | Rear Markings and Reflectors | 0.60% |
| 2019 to 2020 | Quarter 4: January to March | Condition of Chassis | 0.50% |
| 2019 to 2020 | Quarter 4: January to March | Sideguards,Under Run & Bumpers | 0.30% |
| 2019 to 2020 | Quarter 3: October to December | Service Brake Performance | 3.80% |
| 2019 to 2020 | Quarter 3: October to December | Parking Brake Performance | 2.20% |
| 2019 to 2020 | Quarter 3: October to December | Lamps | 1.80% |
| 2019 to 2020 | Quarter 3: October to December | Brake Systems Components | 1.80% |
| 2019 to 2020 | Quarter 3: October to December | Suspension | 1.10% |
| 2019 to 2020 | Quarter 3: October to December | Reflectors & Rear Markings | 0.60% |
| 2019 to 2020 | Quarter 3: October to December | Spray suppression, wings / wheel arches | 0.60% |
| 2019 to 2020 | Quarter 3: October to December | Tyres (Condition) | 0.50% |
| 2019 to 2020 | Quarter 3: October to December | Bumpers/Sguards | 0.30% |
| 2019 to 2020 | Quarter 3: October to December | Road Wheels and Hubs | 0.20% |
| 2019 to 2020 | Quarter 2: July to September | Service Brake Performance | 3.70% |
| 2019 to 2020 | Quarter 2: July to September | Parking Brake Performance | 2.40% |
| 2019 to 2020 | Quarter 2: July to September | Lamps | 1.60% |
| 2019 to 2020 | Quarter 2: July to September | Brake System Components | 1.60% |
| 2019 to 2020 | Quarter 2: July to September | Suspension | 1.10% |
| 2019 to 2020 | Quarter 2: July to September | Reflectors & Rear Markings | 0.50% |
| 2019 to 2020 | Quarter 2: July to September | Spray suppression, wings / wheel arches | 0.50% |
| 2019 to 2020 | Quarter 2: July to September | Tyres (Condition) | 0.50% |
| 2019 to 2020 | Quarter 2: July to September | Bumpers/Sguards | 0.20% |
| 2019 to 2020 | Quarter 2: July to September | Service Brake Operation | 0.20% |
| 2019 to 2020 | Quarter 1: April to June | Service Brake Performance | 3.70% |
| 2019 to 2020 | Quarter 1: April to June | Parking Brake Performance | 2.30% |
| 2019 to 2020 | Quarter 1: April to June | Lamps | 1.60% |
| 2019 to 2020 | Quarter 1: April to June | Brake System Components | 1.50% |
| 2019 to 2020 | Quarter 1: April to June | Suspension | 1.10% |
| 2019 to 2020 | Quarter 1: April to June | Reflectors & Rear Markings | 0.60% |
| 2019 to 2020 | Quarter 1: April to June | Spray suppression, wings / wheel arches | 0.50% |
| 2019 to 2020 | Quarter 1: April to June | Tyres (Condition) | 0.50% |
| 2019 to 2020 | Quarter 1: April to June | Bumpers/Sguards | 0.20% |
| 2019 to 2020 | Quarter 1: April to June | Service Brake Operation | 0.20% |
| 2018 to 2019 | Total | Service Brake Performance | 5.00% |
| 2018 to 2019 | Total | Parking Brake Performance | 3.20% |
| 2018 to 2019 | Total | Lamps | 2.00% |
| 2018 to 2019 | Total | Brake System Components | 1.90% |
| 2018 to 2019 | Total | Suspension | 1.30% |
| 2018 to 2019 | Total | Reflectors & Rear Markings | 0.70% |
| 2018 to 2019 | Total | Spray suppression, wings / wheel arches | 0.60% |
| 2018 to 2019 | Total | Tyres (Condition) | 0.50% |
| 2018 to 2019 | Total | Bumpers/Sguards | 0.30% |
| 2018 to 2019 | Total | Service Brake Operation | 0.20% |
| 2017 to 2018 | Total | Service Brake Performance | 5.00% |
| 2017 to 2018 | Total | Parking Brake Performance | 3.20% |
| 2017 to 2018 | Total | Lamps | 2.30% |
| 2017 to 2018 | Total | Brake System Components | 2.00% |
| 2017 to 2018 | Total | Suspension | 1.30% |
| 2017 to 2018 | Total | Reflectors & Rear Markings | 0.80% |
| 2017 to 2018 | Total | Spray suppression, wings / wheel arches | 0.70% |
| 2017 to 2018 | Total | Tyres (Condition) | 0.50% |
| 2017 to 2018 | Total | Bumpers/Sguards | 0.30% |
| 2017 to 2018 | Total | Service Brake Operation | 0.30% |
| 2016 to 2017 | Total | Service Brake Performance | 5.40% |
| 2016 to 2017 | Total | Parking Brake Performance | 3.10% |
| 2016 to 2017 | Total | Lamps | 2.30% |
| 2016 to 2017 | Total | Brake System Components | 2.10% |
| 2016 to 2017 | Total | Suspension | 1.20% |
| 2016 to 2017 | Total | Reflectors & Rear Markings | 0.90% |
| 2016 to 2017 | Total | Spray suppression, wings / wheel arches | 0.60% |
| 2016 to 2017 | Total | Tyres (Condition) | 0.50% |
| 2016 to 2017 | Total | Bumpers/Sguards | 0.30% |
| 2016 to 2017 | Total | Service Brake Operation | 0.30% |
| 2015 to 2016 | Total | Service Brake Performance | 5.50% |
| 2015 to 2016 | Total | Parking Brake Performance | 3.40% |
| 2015 to 2016 | Total | Lamps | 2.30% |
| 2015 to 2016 | Total | Brake System Components | 2.10% |
| 2015 to 2016 | Total | Suspension | 1.30% |
| 2015 to 2016 | Total | Reflectors & Rear Markings | 0.90% |
| 2015 to 2016 | Total | Spray suppression, wings / wheel arches | 0.60% |
| 2015 to 2016 | Total | Tyres (Condition) | 0.50% |
| 2015 to 2016 | Total | Service Brake Operation | 0.30% |
| 2015 to 2016 | Total | Bumpers/Sguards | 0.30% |
| 2014 to 2015 | Total | Service Brake Performance | 6.50% |
| 2014 to 2015 | Total | Parking Brake Performance | 3.80% |
| 2014 to 2015 | Total | Lamps | 2.60% |
| 2014 to 2015 | Total | Brake System Components | 2.40% |
| 2014 to 2015 | Total | Suspension | 1.50% |
| 2014 to 2015 | Total | Reflectors & Rear Markings | 1.00% |
| 2014 to 2015 | Total | Spray suppression, wings / wheel arches | 0.60% |
| 2014 to 2015 | Total | Tyres (Condition) | 0.60% |
| 2014 to 2015 | Total | Service Brake Operation | 0.40% |
| 2014 to 2015 | Total | Bumpers/Sguards | - |
| 2013 to 2014 | Total | Service Brake Performance | 7.30% |
| 2013 to 2014 | Total | Parking Brake Performance | 4.70% |
| 2013 to 2014 | Total | Lamps | 2.60% |
| 2013 to 2014 | Total | Brake System Components | 2.50% |
| 2013 to 2014 | Total | Suspension | 1.50% |
| 2013 to 2014 | Total | Reflectors & Rear Markings | 1.00% |
| 2013 to 2014 | Total | Spray suppression, wings / wheel arches | 0.60% |
| 2013 to 2014 | Total | Tyres (Condition) | 0.50% |
| 2013 to 2014 | Total | Service Brake Operation | 0.40% |
| 2013 to 2014 | Total | Bumpers/Sguards | - |