The Stone Roses singer, who did not appear at Stoke Magistrates Court last Thursday, was told he faced disqualification after being caught driving his Lexus at 93mph in a 40mph zone in October last year.
The Mirror reports that Judge David Taylor was "angered" by the star for changing his plea to guilty at the last minute, adding: "This will lead to disqualification."
Brown will be formally sentenced on November 24.
Last month, the singer escaped a driving ban after successfully arguing that it would cause "insurmountable" problems for his reformation with his Stone Roses bandmates.
He was previously fined a total of £965 and received six penalty points on his licence.
Earlier this month, the Stone Roses confirmed a string of tour dates across the UK and Europe.
> Stone Roses tickets sell out - Ian Brown 'overjoyed'
Watch the video for Stone Roses hit 'Fool's Gold' below: