Worn brakes make that awful scraping sound right when you least want an extra bill. Keeping a car on the road means dealing with routine wear, and brakes are one of those things you simply cannot ignore. Spring shop specials are the best time to handle this because service centers drop their labor rates to fill bays.
Before you talk about how you are going to pay, get the shop to separate parts from labor on the estimate. You want to know what the pads and rotors actually cost by themselves. Once you have a firm number, we can look at the best way to handle the cash flow.
Remember that the 0% intro APR for 15 months on purchases and balance transfers is a hard deadline, not free money. If you still have a remaining balance when those 15 months run out, the card company will charge interest on the original amount from day one.