PontiacBonnevilleClub.com

anyone know what this means?

It means you have brake rotors on your car.

Wanna be a bit more specific? Are the squealers dragging on the rotors? Thin pads? Age of rotors? If you're more specific and detailed in your original post, you won't have to wait for us to ask a bunch of questions. Squealing is pretty general, especially when it appears you already have it apart for inspection.

viewtopic.php?f=19&t=25803

I have new pads ,calipers and rotors and lines.
that pic is from the left side and it squeals really badly when stopping, im sure i could break ear drums.

That's information that would have been good to know in your original post. I assumed the opposite (old pads and rotors)

Did you properly bed the rotors?
Did you re-grease the caliper pins?
Did you use anti-squeal compound on the back of the pads?

(these 3 steps are normal everyday routine when working with disc brakes)

What brand of pads and rotors?

I did everything i needed to do.I don't remember what brand of rotors and pads ,i just ordered the best pads and rotors u can get and got them from napa.

Is it by chance the rotor rubbing against the backing plate?

We need to know more details about your caliper lube and squeak stop application. We also need clarification on the sound. Is it squealing or chirping?

Looks overheated to me.
If they weren't broken in properly they could have burnished. Try sanding the brake pads with some rough sandpaper to remove the smooth burnt surface. Not too much. Also make sure you use plenty of silicone grease on the pad backing plates.
Follow proper break in procedures. Light stops from 30 mph about 5 times and then moderately heavy stops from 60 mph to a complete stop about 5 times, letting them cool off between applications.

Don't completely stop dead while burnishing brakes, always slow to a few miles an hour. If you stop completely you can leave imprints in the rotor, IIRC.

You are supposed to come to a dead stop but do not keep the brakes depressed for more than a second and cool immediately.

I have seen time and time again where people have bought Pads that were not of the highest quality... some of the pad were too hard and caused issues with the rotors... The pads can hard spot and create these issues, and once warm they squeal like mad when you apply the brakes... Sanding them will not fix this issue...I have sanded pads before and for different reasons.. And that has worked...

From what I have gathered and understand from Jeff... There are only a few possibilities left...

Pads suck

Caliper is not sliding causing hot spots

or the Caliper piston is sticking...