When your Crashbreaker meter is at 99%, press X. You will only have to tap Circle two or three times to get a full Crashbreaker. Additionally, hold R1 until the Crashbreaker meter gets to 100%. When it does, it will be easier to blow up your car with R2.
Use Impact Time on Crash events before the Crashbreaker meter fills. The slower time makes the Crashbreaker easier to bring back up to 100% without having to wildly tap the button.
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