Why doesn't a car's brake work when the engine is off? - Quora
My mistake.
I once encountered a situation after pumping the brakes before (with the engine off) after falling thru a drainage manhole and need help to be pushed out.
In that situation, after I was helped out, there was no more braking power even with the brake pedal straight to the floor.
After I started the car, had to pump the brake a few more times before pressure was restored.
It was a 1999 Revo MT.





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