Brake fluid should be changed every five years or so. Bleeding and flushing is just when they pump a large amount of fluid thru the system and allow it run out at all four wheels eliminating all air from the system.
The EGR valve thing we do ourselves. It's on the pass side rear of the engine. It's easy to remove and clean. With the valve off, start the engine and spray LOTS of carb cleaner down the small tube that leads into the intake. Hit the throttle on the front of the engine by hand to keep it running as the cleaner pushes thru. You may get a check engine light for running the engine with the EGR valve off. Erase the code.
The #1 question on this page shows how to clean the EGR system-
http://www.isuzufaq.com
Mark
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