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Your anti-lock control unit computer may be faulty. You should check the diagnostic codes of your ECU, which is under the passenger side floor mat and carpet, under a piece of wood. The anti-lock control unit is somewhere under the back seat, if you have a 2+2 like mine. It is very expensive to replace with a new one, but reasonably cheap to get a used one. I got a used one from a Nissan-only wrecker for around $200 and had my mechanic put it in. My '90 2+2 NA didn't have ABS for years before I got it, and now it works great.

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Q: Your 1991 300zx antilock brake light stays on?
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