Brake problem. New pads, hard brake pedal- barely stops car. Slight hissing noise under dash.
It sounds like the brake servo isn't working but you should still have some better brakes than you dascribe so i would also check the master cylinder , whick is connected directly to the servo , quick check ,engine running remove, brake fluid resovoir cap, pump brake pedal and get some to look into the fluid resovoir and tell you is there are air bubbles or not , if bubbles most likely a seal has blown if no bubble then most likely a mechanical part of the brake system ie master push rod at fault , either way i'd get a mechanic to check as you dont take chance's with brakes
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