MOT History from tests of petrol BSA B31s year 1955

Review the list of common BSA B31 failures below or to perform a specific mot history check on your BSA then use our popular KnowYourCar service

mot history

Pass percent:92.98%

(The average a petrol BSA B31 year 1955 passes without issue)

Based on:399 MOT Tests

Most common failures	No# failures
Nearside Handlebar handgrip not secure to handlebars. \|2.1.1c\|	4
Horn not working \|1.7.3a\|	3
Steering headbearing has excessive free play \|2.2.2\|	3
Headlamp aim out of alignment	3
Brake lever has inadequate reserve travel \|3.1.3b\|	2
Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	2
Front Horn not working \|1.7.3a\|	2
Rear shock absorber has inadequate damping effect. \|2.4.A.3b\|	2
Fuel cap sealing washer deteriorated \|7.2.2c\|	1
Fuel system component leaking \|7.2.1a\|	1
All position lamps do not illuminate immediately when switched on \|1.1.3a\|	1
Headlamp at least one does not illuminate on dipped beam \|1.2.2a\|i\|\|	1
Headlamp at least one does not illuminate on main beam \|1.2.2a\|ii\|\|	1
Front wheel bearings have excessive free play \|2.3.5b\|	1
Front Steering headbearing has excessive free play \|2.2.2\|	1
Front suspension has excessive stiffness in the suspension movement. \|2.3.6b\|	1
Floor brake test No brake control achieves an efficiency of 30%. \|3.3.C1a\|	1
Front Roller brake test indicates a severely grabbing brake \|3.3.A1b\|	1
Front Roller brake test indicates a sticking brake \|3.3.A1a\|	1
Front Front position lamp does not illuminate immediately when switched on \|1.1.3a\|	1
Roller brake test The less effective brake control does not achieve an efficiency of 25%. \|3.3.A2b\|	1
Centre Front Front position lamp does not illuminate immediately when switched on \|1.1.3a\|	1
Throttle has a significant change in engine speed whilst moving the steering from lock to lock \|2.1.4\|	1
Rear wheel bearings have excessive free play \|2.4.A.2c\|	1
Headlamp switch faulty \|1.2.4\|	1
Front Roller brake test indicates a severely juddering brake \|3.3.A1b\|	1
Nearside Steering lock stop missing \|2.1.3\|	1
Offside Steering lock stop missing \|2.1.3\|	1
Nearside Front Handlebar handgrip not secure to handlebars. \|2.1.1c\|	1
Front position lamp does not illuminate immediately when switched on \|1.1.3a\|	1
Rear Floor brake test indicates a sticking brake \|3.3.C2c\|	1
Front Brake reaction bracket insecure \|3.2.A1j\|	1
Rear position lamp does not illuminate immediately when it is switched on \|1.1.3a\|	1
Offside Handlebar handgrip not secure to handlebars. \|2.1.1c\|	1

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
Nearside Handlebar handgrip not secure to handlebars. \|2.1.1c\|	4
Horn not working \|1.7.3a\|	3
Steering headbearing has excessive free play \|2.2.2\|	3
Headlamp aim out of alignment	3
Brake lever has inadequate reserve travel \|3.1.3b\|	2
Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	2
Front Horn not working \|1.7.3a\|	2
Rear shock absorber has inadequate damping effect. \|2.4.A.3b\|	2
Fuel cap sealing washer deteriorated \|7.2.2c\|	1
Fuel system component leaking \|7.2.1a\|	1
All position lamps do not illuminate immediately when switched on \|1.1.3a\|	1
Headlamp at least one does not illuminate on dipped beam \|1.2.2a\|i\|\|	1
Headlamp at least one does not illuminate on main beam \|1.2.2a\|ii\|\|	1
Front wheel bearings have excessive free play \|2.3.5b\|	1
Front Steering headbearing has excessive free play \|2.2.2\|	1
Front suspension has excessive stiffness in the suspension movement. \|2.3.6b\|	1
Floor brake test No brake control achieves an efficiency of 30%. \|3.3.C1a\|	1
Front Roller brake test indicates a severely grabbing brake \|3.3.A1b\|	1
Front Roller brake test indicates a sticking brake \|3.3.A1a\|	1
Front Front position lamp does not illuminate immediately when switched on \|1.1.3a\|	1
Roller brake test The less effective brake control does not achieve an efficiency of 25%. \|3.3.A2b\|	1
Centre Front Front position lamp does not illuminate immediately when switched on \|1.1.3a\|	1
Throttle has a significant change in engine speed whilst moving the steering from lock to lock \|2.1.4\|	1
Rear wheel bearings have excessive free play \|2.4.A.2c\|	1
Headlamp switch faulty \|1.2.4\|	1
Front Roller brake test indicates a severely juddering brake \|3.3.A1b\|	1
Nearside Steering lock stop missing \|2.1.3\|	1
Offside Steering lock stop missing \|2.1.3\|	1
Nearside Front Handlebar handgrip not secure to handlebars. \|2.1.1c\|	1
Front position lamp does not illuminate immediately when switched on \|1.1.3a\|	1
Rear Floor brake test indicates a sticking brake \|3.3.C2c\|	1
Front Brake reaction bracket insecure \|3.2.A1j\|	1
Rear position lamp does not illuminate immediately when it is switched on \|1.1.3a\|	1
Offside Handlebar handgrip not secure to handlebars. \|2.1.1c\|	1

MOT History from tests of petrol BSA B31s year 1955

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