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Just DYI since its a $12x6 plugs=68 Labor free just take about an hr and save you time and money. $150 for a brake flush dame i bought that bottle from them for $10 and did it myself in 20min.
Listen to this advice on the plugs. You move the wire harness over and it's easy to do the plugs for $68. Just take the old ones out and put the new ones it. Only a few bolts and there's a set of instructions on this bulletin board. The dealer is charging you ~$150 for the plugs and $100 for the labor (it took me 25 minutes from start to finish).
Regarding the $150 for the brake fluid change that is a fair price in my opinion. For your 1st time, by the time you lift the car up and take off all the wheels to this, spill brake fluid all over your clean garage floor and then end up with air in your lines after 10 minutes of bleeding the brakes and still needing to re-bleed them... it's worth it. I've heard of these stories happening to other people...