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1990 C4 Loss of power brakes

Brakes

Vehicle Information: Year: 1990; Body Type: Convertible; Total Mileage: 73000;

My power brakes on this car just quit assisting as it sat around the yard. They worked 3 weeks ago and the pedal is firm and no fluid leaks. I understand these do not use a vacuum servo, but rather a complex electro hydrolic system ala Audi. Is there anything fused or relayed in this system. I havn't climbed under to see if the pump belt is operating, but that was my next move.

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