In my 300cd daily driver I recently had the brakes soften up ,soon after the car wouldnt shut off .The caliper leaking was lowering the brake fluid reservior but would this affect the vacuum needed somehow for the vacuum shut off box ?.Ive checked the main vac line for any leaks and the shut off box for vacuum hold with good results. Monday Im in for a caliper replacement but as far as other parts has anyone had a similiar issue?