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Q:

I have to press hard on the brakes to stop car on 2000 Nissan Altima

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It started 2 days ago and it happens each time i have to brake.
(2) Answers
Most likely there's a problem with the power brake booster. It could be simple, like a collapsed vacuum hose or bad check valve, or could be something like a torn diaphragm in the booster which would then require replacement.
It could also be other problems in the brake system, like a failed master cylinder.
Get it checked ASAP, brakes are a safety item.
If you want to find a Nissan specialist, here's our directory link for you:
https://repairpal.com/directory?address=34982&car_brand_names=Nissan
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