At a recent London mayor's question time, Caroline Pidgeon, Liberal Democrat member for Greater London Authority, asked Boris Johnson which were the 10 worst performing bus routes in the capital.
The 79, 114, 226 and 228, all of which run through Brent, were picked out as bad routes, based on the length of time people have to wait over and above the published, expected frequency of service.
To add to the misery, the Jubilee, Metropolitan and Bakerloo tube lines were all down last weekend, causing more chaos as bus replacement vehicles clogged up the borough's streets.
Councillor Daniel Brown, Liberal Democrat spokesman, said: "I'm shocked to hear that not only is the mayor letting Brent's tube travellers down badly by allowing weekends where all three major tubes lines in Brent are closed for overdue works, but also that nearly half of London's worst performing bus routes run through Brent too.
"If Boris is going to close our tube lines, he needs to make sure there is an adequate bus service in the borough to allow people to get about.
"It's clear, by his own admission, that he's failing to do that. The residents of Brent are rightly furious."
Mr Johnson explained Transport for London (TfL) is working to help solve the problems.
He said: "In each case, TfL is working with the relevant operator to identify solutions to the performance difficulties which exist, which in most cases arise as a result of the impacts of road works.
"The figures show excess waiting time, which is a measure of reliability for routes which run at a high frequency, and is calculated by subtracting actual waiting time from scheduled waiting time.
"The routes included in this list will change regularly as works are completed and others commence.
"The figures are not therefore a measure of long-term problems or poor performance specifically within the control of the operator."