Antique Super Vortex

Bros
I rebuilt my Avanti2001 and run on Sat with HPI Gold + Super Vortex.
Initially car speed is very good but the ESC stop response after two pack battery ( I think after I applied sudden break then it stop working ). T think that was the motor problem, but when I change to use Tekin ESC then the motor resume normal.

Any bros still have the Super vortex's manual for my quick reference ?
Any bros can tell whether the Super Vortex have break function or not ?   

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this is a good esc, I believe no reverse.

This was a very expensive ESC, I remember almost HK$800 when I bought it 18-20yrs ago !!
Perhaps transistor damaged, any bros know where can I take it for repair ?