brakes 20% on 1991 Mazda Protege

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hello, was told brakes have 20% left and should be changed. how low can they go and be safe?
(1) Answer
Your car is light, so 20% should last 5k to 10k miles. Maybe more, but you have to assume "20%" is accurate and your pads would last about 50k miles or more normally. Get them checked at your next oil change and make plans to do a brake job in the near future.
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