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Yes, you have a failed brake accumulator sphere. With no nitrogen pressure reserve, pressing the brake pedal drops the pressure in the system to almost nothing which illuminates the brake warning light, then the brake pump immediately brings the pressure back up high enough to turn off the warning light as it has no nitrogen to push against. Fluids are not compressible so just a couple pumps of the brake pump will bring the pressure back up. Replace both spheres now, the other one will be close behind the completely failed one.
 
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