The anti-lock brake (ABS) accumulator may fail causing loss of power brake assist. (The brake pedal will become very hard.)
Problems for specific Chevrolet Lumina years:
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Newest reported 1990 Chevrolet Lumina problems
The ABS master cylinder assembly may fail internally causing the ABS light to illuminate.
Timing gears may wear causing a mild to severe knocking noise from the front of the engine. Replacement of the timing gears is necessary.