There are a couple reasons the brakes on your vehicle could be squeaking.
The first is if your vehicle has been sitting for several days. Sometimes surface rust can develop on the stopping surface of your brake rotors, causing a squeak noise during your first few brake applications. This is not a safety concern and this will normally stop after a few brake applications.
The second reason could be that your brakes are low and in need of replacement. Some vehicles have metal tabs that act as wear indications to let the driver know when the brakes are low by squeaking. But even vehicles without those indicators built in, will often squeak when the brakes are very low and ready for a Brake Repair.
