I have no clue what books or info you are reading or dreaming up... but telling someone not to change and flush brake fluid is flat out dangerous.. Mitsubishi recomends changing ( doing a complete flush of brake fluid ) every 2 years.

Brembo that makes the brakes for the Evo says every 18 months...here is from their website...

B. All brembo braking products use natural-rubber base seals, and therefore are INCOMPATIBLE with DOT-5 SILICONE-based brake fluids. DOT- 5 SILICONE-based fluids react with natural-rubber seals to swell them WHICH CAN CAUSE SEVERE PISTON RETRACTION PROBLEMS. There is no cure for problems caused by DOT- 5 use other than complete seals replacement - USE ONLY DOT-3/4 NON-SILICONE TYPE FLUIDS such as CASTROLTM 'LMA' in your brembo components.(Yes, we know the cap on the rectangular master cylinders says "DOT 3 - 5 Fluids"-BUT PLEASE NOTE: Silicone DOT- 5 fluids are NOT generally in use in Europe, but Glycol-based "DOT-5.1" fluids ARE. Hence, the "DOT-5" cap designation). For best braking performance, we recommend changing brake fluid twice a year. If the machine is to be stored in a damp environment (over the winter, say), we recommend installing fresh fluid before and after the storage period. At minimum service levels, glycol brake fluids MUST be completely changed at intervals not to exceed a period of 18 months.

Here is another source as well....

http://www.dummies.com/how-to/conten...ake-fluid.html

 

I can vouch for this also, I used to own an IS350, those cars actually have big 4 piston brake calipers. Manual states to change every 2 years specifically. So for our cars with high performance brakes I wouldnt go over 2 years regular driving or track.

 

what are the consequences of not flushing the brakes like lets say in 5 years???

 

well if your car still stops, there shouldn't be a consequence per say. you should have noticed reduced stopping power and spongy pedal feel however.

perform through visual inspection of check master cylinder, lines and calipers for leaks.

flush fluid & bleed. don't forget the clutch slave cylinder. it shares the same fluid as your brakes.

 

The high moisture content in old brake fluid can also rust/corrode your brake system from the inside out, plus damage the internal piston seals inside your calipers.

 

Personally, for daily driver, I flush the brake fluid at least once every 2 years.

If I boiled the fluid on track, I will flush it as well.

I flush my track car's brake fluid even more frequent.

 

Flush your fluid often...why not, it's easy and good for your $40,000 car. Why not just do it seasonally. Check your dust boots too. They get cracked from the heat (if you ever are at the track). If they crack replace them and your seals. It's a fun project that isn't difficult and will keep your calipers happy.

For the record, we change the fluid every weekend and boots and seals 4 times a season.

 

Good policy

 

Change the stuff at least one a year. It's just really easy to do anyways. For safety's sake and piece of mind, would not mind spending the extra money on brake fluid to have maximum stopping feel/ power every time I need the brakes.