Reason I asked is there is a lot more to a brake job than just hanging new pads. There's a lot of things professionals do to prevent noises from occurring, and there's a lot of things do-it-yourselfers can do to accidentally cause noises. Knowing who did the last job will help in knowing where to start looking.
A squeal can result if the edges of the new pads weren't prepared before they were installed. The fingers on the calipers that contact the outer pads, and the surfaces of the pistons that contact the inner pads have to be cleaned with a flat file to remove any rust, dirt, or glue, then those surfaces must be coated with a special high-temperature brake grease. The calipers' mounting pads must be cleaned and coated too so any squeal that does occur doesn't get transmitted to the steering knuckle where it will be amplified.
There are also multiple things to look for when machining the rotors or when installing new ones. One thing do-it-yourselfers are often guilty of is getting grease, including fingerprint grease, or other contaminants on the friction surfaces. Once the pads and rotors have gone through a heat-up cycle, those contaminants will soak into the pads and the rotors. Cast iron is porous and will absorb grease. That will cause a squeal. The only way to solve that is to replace the pads and rotors again.
Saturday, January 9th, 2016 AT 9:37 AM