There are different qualities of brake pads. The cheaper ones tend to make a squeaking noise. There are different qualities of brake jobs. Some shops will just replace the brake pads and leave the old rotors (we call the a pad slap)and this will make noise.
It*s impossible to tell you if your squeaking sound indicates that something is wrong. If you are questioning the safety of your brakes, please bring it back to the shop that did the repairs and have them check it out!
〉 Answered on Jan 27th, 2009 by Amy Mattinat, Owner and Author at Auto Craftsmen Ltd
Not long ago, brake pads were made with different materials than they are today. They were extremely quiet, but not healthy for the environment or for the people that had to work on or around the brakes. Realizing the health hazards, the materials have been changed. Although today's brake materials do not pose as much of an environmental or health issue, they are not always as quiet as they used to be. So, in answer to your question, yes, it is normal to still hear some squeaking even after a brake job, especially for the first few brake applications while the brakes are still cold. However, if it is a really loud noise or if your gut is telling you something is really wrong, it is always safer to have your brakes checked out.
〉 Answered on Jan 27th, 2009 by Suzanne Grego, Technician at City of Philadelphia Fleet Management