Disc Brake Squeal
- Thread starter Wingman
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Did you apply lube to the sliders and the backs of the new pads?
Now that you have new pads on the front, take a look at the rotor for rust buildup. Maybe you can remove that buildup.
I can explain further if needed! 
I like Permatex Green or Black which I use on the slider too!
There is a Permatex Purple lube also but, it's really costly.
Lots of guys use grease or never-seize on the sliders. I don't like either of those products for the sliders.
I guess, any brake anti-squeel will cut down on the noise. Let me link the Permatex brake lube.
http://www.permatex.com/products-2/produ...ubricant-detail
There is this specific picture on the site showing it being brushed on to the backs or the pads. Scroll down to the "Specialty Lubes" and this is how I use it!
http://www.permatex.com/products/product-categories/lubricants
And these directions:
http://www.permatex.com/component/docume...ns&id=24125
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Brand? Type of pads.
Originally Posted By: rshaw125
Brand? Type of pads.
And of course, I got the most noise out of Organic Pads, less with Semi-Mets and no noise with Ceramic 
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Have you tried re-bedding the pads yet? Did you bed them in in the first place? I know about 5% of people actually do this, but it SHOULD be done with most sets of brake pads.
Originally Posted By: KenO
Have you tried re-bedding the pads yet? Did you bed them in in the first place? I know about 5% of people actually do this, but it SHOULD be done with most sets of brake pads.
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I applied the caliper grease to the pins and the back of the pads and the squeal is gone. This is something I have never done when I replaced my brake pads, but I will from now on. I will also "bed" the pads from now on also. Thanks for all the great advice. Problem solved!!!
I use anti-seize on the pad sliding contact points (the "ears"), silicone paste on the slide pins, then Permatex Green Caliper Lube on the pad backs.
I was turned off of using the Permatex Green on the slide pins after reading stories of it destroying the rubber boots on the caliper pins. Check out these reviews: http://www.amazon.com/Permatex-24110-Ultra-Brake-Caliper/dp/B000HBNV6W
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Oops, just saw that you already fixed your squealing, congrats!
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there have been a couple of times where grease and goo have not solved the problem for me, and the solution was to scuff both sides of the rotors with a belt sander, allowing the rotor to spin by the friction of the belt while applying consistent pressure. it leaves a nice cross-hatch pattern and probably takes 3 minutes per rotor, about a minute per side.
The squeal is caused by the accumulated pad material on the rotor, in a layer too thin to see, grabbing, releasing, grabbing the pad very quickly. The pad steel backing plate rubs against the piston at a very high frequency, and we have the squeal.
Either a lubricant or rubber-like damping layer on the pad back can stop the squeal. Physically abrading the rotor surface to remove the layer is always a good bet. Just a good hand sanding with emery cloth works. Proper break in helps.
Cheap metallic pads will squeal all day long. I hate the regular Duralast pads. I replaced pads and rotors on the front of my Trailblazer with them. Still squealing over a year later. I put Duralast Golds on the back. No noise from them.
We have the same issue with many of the used cars we sell with inexpensive metallic brakes on them. We usually end up upgrading the pads in the interest of customer satisfaction.
OTOH, I prefer brakes that squeal. Thats why I daily on pads like Hawk HP+ or PBR Axxis Ultimates
I know there are two schools of thought on bedding in brakes. I'm not one for bedding in the pad with 10-30 stops!
I just drive normaly and all is GOOD! Has been for over 40 years.
When I have bedded in brakes by doing the many stops, I also had rotor problems sooner...like in 2-3 months! Just my .02cents 
Originally Posted By: Char Baby
I know there are two schools of thought on bedding in brakes. I'm not one for bedding in the pad with 10-30 stops!
I just drive normaly and all is GOOD! Has been for over 40 years.
When I have bedded in brakes by doing the many stops, I also had rotor problems sooner...like in 2-3 months! Just my .02cents
Most folks never get that bedding must be gauged to the type of car and brakes. Small econoboxes with tiny little brakes don't need much, faster cars with bigger brakes and more swept area, etc., need a lot more stops from higher speeds.
Then there's the pad material, which must be taken in to account also. There's a ton of variables, and most cars never need the procedure anyway, just for us road course nuts...
Originally Posted By: SteveSRT8
Most folks never get that bedding must be gauged to the type of car and brakes. Small econoboxes with tiny little brakes don't need much, faster cars with bigger brakes and more swept area, etc., need a lot more stops from higher speeds.
Then there's the pad material, which must be taken in to account also. There's a ton of variables, and most cars never need the procedure anyway, just for us road course nuts...
Originally Posted By: KenO
Originally Posted By: Char Baby
I know there are two schools of thought on bedding in brakes. I'm not one for bedding in the pad with 10-30 stops!
I just drive normaly and all is GOOD! Has been for over 40 years.
When I have bedded in brakes by doing the many stops, I also had rotor problems sooner...like in 2-3 months! Just my .02cents
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