Can underinflated tyres affect braking?

nidirect specifically warns that both under-inflation and over-inflation can adversely affect steering and braking.

Low pressure also increases tyre flex and heat, while excessive pressure can reduce the effective contact patch and change ride behaviour.

Use the vehicle manufacturer's recommended pressures and adjust them for load where the handbook specifies different full-load figures.

For 'Can underinflated tyres affect braking?', treat the issue as a current roadworthiness matter rather than something to leave until the next MOT. A valid MOT does not protect you if the vehicle develops a defect afterwards.

Check the current source for 'Can underinflated tyres affect braking?' before acting if the relevant rule, policy, fee or eligibility has recently changed. Keep any official confirmation or reference number produced by the process because it can help resolve a later query. This note is specific to answer 465.