Owning a car is a constant cycle of maintenance, and brakes are the one thing you really cannot skip. When your car starts to squeal or pull to the side, it is time to act before the repair bill grows.
You can usually find the best prices on brake jobs during off-peak months like January or February when shops are looking for work. Use a local coupon to bring that $550 total down before you even head to the counter.
Remember that the 18-month window is a deadline, not free money. If you have a balance remaining after the 18 months, the bank will start charging interest on what is left, which defeats the purpose of the plan.