MOT History from tests of petrol TRIUMPH BONNEVILLEs year 1978

Review the list of common TRIUMPH BONNEVILLE failures below or to perform a specific mot history check on your TRIUMPH then use our popular KnowYourCar service

mot history

Pass percent:85.97%

(The average a petrol TRIUMPH BONNEVILLE year 1978 passes without issue)

Based on:2,494 MOT Tests

Most common failures	No# failures
Headlamp aim out of alignment	66
Rear position lamp does not illuminate immediately when it is switched on \|1.1.3a\|	29
Registration plate issues	27
Rear Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	20
Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	20
Rear Roller brake test indicates a binding brake \|3.3.A1a\|	13
Roller brake test The less effective brake control does not achieve an efficiency of 25%. \|3.3.A2b\|	13
Headlamp at least one does not illuminate on main beam \|1.2.2a\|ii\|\|	9
Horn not working \|1.7.3a\|	9
Rear reflector on motorcycle missing \|1.4.1\|	8
Headlamp at least one does not illuminate on dipped beam \|1.2.2a\|i\|\|	8
Drive chain excessively loose \|6.2.1d\|	8
Wheel alignment incorrect which adversely affects the handling \|2.5.1\|	7
Nearside Front shock absorber seal failed and leaking oil \|2.3.3\|	7
Front Roller brake test indicates a binding brake \|3.3.A1a\|	6
Front position lamp does not illuminate immediately when switched on \|1.1.3a\|	6
Front Brake lever has inadequate reserve travel \|3.1.3b\|	5
Locking device\|s\| not correctly fitted which may make the motor bicycle dangerous to ride \|6.2.1h\|	5
Rear Wheel alignment incorrect which adversely affects the handling \|2.5.1\|	5
Front wheel bearings have excessive free play \|2.3.5b\|	5
Front wheel bearings are excessively rough \|2.3.5b\|	5
Rear Roller brake test indicates excessive fluctuation of brake effort \|3.3.A1d\|	4
Throttle operating incorrectly \|6.2.1f\|	4
Drive chain excessively tight \|6.2.1d\|	4
Steering headbearing has excessive free play \|2.2.2\|	4
Offside Front shock absorber seal failed and leaking oil \|2.3.3\|	4
Rear Brake disc\|s\| friction surface contaminated by oil or grease \|3.2.A1k\|	4
Rear Brake disc\|s\| has excessive run out \|3.2.A1m\|	3
Nearside Direction indicators not working \|1.5.1c\|	3
Fuel hose leaking \|7.2.1a\|	3
Rear Roller brake test indicates a sticking brake \|3.3.A1a\|	3
Rear suspension bush has excessive free play \|2.4.A2a\|i\|\|	3
Drive chain worn to excess \|6.2.1e\|	3
Offside Rear Direction indicator not working \|1.5.1c\|	3
Direction indicators flashing less than 60 times a minute \|1.5.1c\|	3
Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort \|3.3.A1c\|	3
Rear Rear position lamp does not illuminate immediately when it is switched on \|1.1.3a\|	3
Stop lamp remains on when the brake is released \|1.3.1e\|	3
Front Roller brake test indicates excessive fluctuation of brake effort \|3.3.A1d\|	3
Headlamp aim beam image kick up to the offside \|1.6\|	3
Horn not loud enough to be heard by another road user \|1.7.3a\|	3
Stop lamp affected by the operation of another lamp \|1.3.2\|	3
Offside Front Direction indicator not working \|1.5.1c\|	3
Nearside Rear Direction indicator not working \|1.5.1c\|	3
Rear wheel bearings have excessive free play \|2.4.A.2c\|	3
Fuel cap sealing washer deteriorated \|7.2.2c\|	3
Direction indicators not working \|1.5.1c\|	3
Brake hose excessively deteriorated	3
Headlamp aim beam image kick-up is to the offside \|1.6.1\|	2
Brake hose damaged	2
Front Direction indicators not working \|1.5.1c\|	2
Rear Direction indicators not working \|1.5.1c\|	2
Rear Floor brake test indicates a sticking brake \|3.3.C2c\|	2
Rear Rear reflector on motorcycle missing \|1.4.1\|	2
Front Steering headbearing has excessive free play \|2.2.2\|	2
Direction indicator not working \|1.5.1c\|	2
Front Headlamp at least one does not illuminate on main beam \|1.2.2a\|ii\|\|	2
Direction indicators affected by the operation of another lamp \|1.5.1c\|	2
Rear Rear suspension bush has excessive free play \|2.4.A2a\|i\|\|	2
Front mudguard insecure \|2.3.7\|	2
Rear Stop lamp remains on when the brake is released \|1.3.1e\|	2
Front Headlamp aim beam image kick up to the offside \|1.6\|	2
Front Front wheel bearings are excessively rough \|2.3.5b\|	2
Nearside Front Direction indicator not working \|1.5.1c\|	2
Rear Brake hose is likely to be fouled or trapped by moving parts \|3.2.B2c\|	2
Front Headlamp dipped beam affected by the operation of another lamp \|1.2.2c\|	2
Wheel alignment incorrect which adversely affects the steering \|2.5.1\|	2
Front Front shock absorber seal failed and leaking oil \|2.3.3\|	2
Front Brake pipe excessively damaged \|3.2.B2a\|	2
Front Wheel has an excessively distorted bead rim. \|4.2.2\|	2
Steering movement excessively `notchy` with the weight on the lower bearing \|2.2.1a\|	2
Front Exhaust is leaking and excessively noisey \|7.1.1b\|	2
Rear Brake disc\|s\| is excessively distorted \|3.2.A1m\|	2
Riders seat insecure \|6.2.1a\|	2
Nearside Rear Direction indicators not working \|1.5.1c\|	2

We get to these numbers by trawling through over 1 billion MOT test results since 2004 and crunched the numbers. We remove anything to do with Tyres, as they are model independent and group together common non-model specific issues. We are trying to get to a picture of what models have what issues.

Please note: We take the data from the DVSA. This data is raw and can contain typos and spelling mistakes that garages may have entered while recording a MOT result. Specifically miss-match on names of models and makes. We are constantly cleaning the data so bear with the odd issue.

Got suggestions? We’re improving this section all the time. If you have any suggestions, please let us know.

Most common failures	No# failures
Headlamp aim out of alignment	66
Rear position lamp does not illuminate immediately when it is switched on \|1.1.3a\|	29
Registration plate issues	27
Rear Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	20
Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	20
Rear Roller brake test indicates a binding brake \|3.3.A1a\|	13
Roller brake test The less effective brake control does not achieve an efficiency of 25%. \|3.3.A2b\|	13
Headlamp at least one does not illuminate on main beam \|1.2.2a\|ii\|\|	9
Horn not working \|1.7.3a\|	9
Rear reflector on motorcycle missing \|1.4.1\|	8
Headlamp at least one does not illuminate on dipped beam \|1.2.2a\|i\|\|	8
Drive chain excessively loose \|6.2.1d\|	8
Wheel alignment incorrect which adversely affects the handling \|2.5.1\|	7
Nearside Front shock absorber seal failed and leaking oil \|2.3.3\|	7
Front Roller brake test indicates a binding brake \|3.3.A1a\|	6
Front position lamp does not illuminate immediately when switched on \|1.1.3a\|	6
Front Brake lever has inadequate reserve travel \|3.1.3b\|	5
Locking device\|s\| not correctly fitted which may make the motor bicycle dangerous to ride \|6.2.1h\|	5
Rear Wheel alignment incorrect which adversely affects the handling \|2.5.1\|	5
Front wheel bearings have excessive free play \|2.3.5b\|	5
Front wheel bearings are excessively rough \|2.3.5b\|	5
Rear Roller brake test indicates excessive fluctuation of brake effort \|3.3.A1d\|	4
Throttle operating incorrectly \|6.2.1f\|	4
Drive chain excessively tight \|6.2.1d\|	4
Steering headbearing has excessive free play \|2.2.2\|	4
Offside Front shock absorber seal failed and leaking oil \|2.3.3\|	4
Rear Brake disc\|s\| friction surface contaminated by oil or grease \|3.2.A1k\|	4
Rear Brake disc\|s\| has excessive run out \|3.2.A1m\|	3
Nearside Direction indicators not working \|1.5.1c\|	3
Fuel hose leaking \|7.2.1a\|	3
Rear Roller brake test indicates a sticking brake \|3.3.A1a\|	3
Rear suspension bush has excessive free play \|2.4.A2a\|i\|\|	3
Drive chain worn to excess \|6.2.1e\|	3
Offside Rear Direction indicator not working \|1.5.1c\|	3
Direction indicators flashing less than 60 times a minute \|1.5.1c\|	3
Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort \|3.3.A1c\|	3
Rear Rear position lamp does not illuminate immediately when it is switched on \|1.1.3a\|	3
Stop lamp remains on when the brake is released \|1.3.1e\|	3
Front Roller brake test indicates excessive fluctuation of brake effort \|3.3.A1d\|	3
Headlamp aim beam image kick up to the offside \|1.6\|	3
Horn not loud enough to be heard by another road user \|1.7.3a\|	3
Stop lamp affected by the operation of another lamp \|1.3.2\|	3
Offside Front Direction indicator not working \|1.5.1c\|	3
Nearside Rear Direction indicator not working \|1.5.1c\|	3
Rear wheel bearings have excessive free play \|2.4.A.2c\|	3
Fuel cap sealing washer deteriorated \|7.2.2c\|	3
Direction indicators not working \|1.5.1c\|	3
Brake hose excessively deteriorated	3
Headlamp aim beam image kick-up is to the offside \|1.6.1\|	2
Brake hose damaged	2
Front Direction indicators not working \|1.5.1c\|	2
Rear Direction indicators not working \|1.5.1c\|	2
Rear Floor brake test indicates a sticking brake \|3.3.C2c\|	2
Rear Rear reflector on motorcycle missing \|1.4.1\|	2
Front Steering headbearing has excessive free play \|2.2.2\|	2
Direction indicator not working \|1.5.1c\|	2
Front Headlamp at least one does not illuminate on main beam \|1.2.2a\|ii\|\|	2
Direction indicators affected by the operation of another lamp \|1.5.1c\|	2
Rear Rear suspension bush has excessive free play \|2.4.A2a\|i\|\|	2
Front mudguard insecure \|2.3.7\|	2
Rear Stop lamp remains on when the brake is released \|1.3.1e\|	2
Front Headlamp aim beam image kick up to the offside \|1.6\|	2
Front Front wheel bearings are excessively rough \|2.3.5b\|	2
Nearside Front Direction indicator not working \|1.5.1c\|	2
Rear Brake hose is likely to be fouled or trapped by moving parts \|3.2.B2c\|	2
Front Headlamp dipped beam affected by the operation of another lamp \|1.2.2c\|	2
Wheel alignment incorrect which adversely affects the steering \|2.5.1\|	2
Front Front shock absorber seal failed and leaking oil \|2.3.3\|	2
Front Brake pipe excessively damaged \|3.2.B2a\|	2
Front Wheel has an excessively distorted bead rim. \|4.2.2\|	2
Steering movement excessively `notchy` with the weight on the lower bearing \|2.2.1a\|	2
Front Exhaust is leaking and excessively noisey \|7.1.1b\|	2
Rear Brake disc\|s\| is excessively distorted \|3.2.A1m\|	2
Riders seat insecure \|6.2.1a\|	2
Nearside Rear Direction indicators not working \|1.5.1c\|	2

MOT History from tests of petrol TRIUMPH BONNEVILLEs year 1978

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