Sounds very strange and even irresponsible.
Did you report the incidents of apparent brake failure to the dealer where you purchased the car?
If you made an insurance claim, did the insurance assessor not check your car mechanically after you reported the suspicion that brake failure was the cause of the accident?
Did you report that brake failure might have been the cause of the accident?
If you suspected that the brakes on the car were not functioning properly why did you continue to drive?
Personally I find the fact that you drove the car in this state, given that your suspicions were proven correct by an AA inspection, unfathomable and irresponsible, perhaps even grounds for having your insurance cancelled or your licence endorsed.