I have a 79 K5 with a 6.6L and my power brakes are acting strange. I have to almost stand up on the brake pedal to stop. I hadnt driven for about 5-6 days and everything seemed normal when I drove to the store today. Upon leaving the store this happens.


Front brakes were changed before I bought it, the rear drums and shoes were replaced a couple months ago. I have had one brake line replaced on the front a few months ago as well. The emergency brake has not worked since I bought my K5 several months ago. Please help.

 

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and what was the solution?