New Brakes squeal
Thread Starter
Instructor
Joined: Mar 2013
Posts: 180
Likes: 21
From: Chesterfield Mo
New Brakes squeal
Installed four rebuilt stainless sleeved O ring calipers and new pads. Now brakes sometimes squeal when driving and stops squealing when brakes are applied. What needs to be done to stop squealing?
Thread Starter
Instructor
Joined: Mar 2013
Posts: 180
Likes: 21
From: Chesterfield Mo
Not disputing your advice just don't know what more I can do to get air out.
Race Director
Joined: May 2006
Posts: 18,740
Likes: 2,583
I think air has nothing to do with it. Apply some anti-squeal compound on the back of the pads.
http://www.walmart.com/ip/42006176?r...569769&veh=sem
http://www.walmart.com/ip/42006176?r...569769&veh=sem
Team Owner
Joined: Sep 2002
Posts: 38,360
Likes: 2,085
From: California
Some of the more expensive ones
Can squeak and squeal too! Did you change brands or types of pads???
I usually will feather the leading edge of the new pads slightly, so they are not riding on the edge, to give them the ability to maybe seat across the face faster!
I usually will feather the leading edge of the new pads slightly, so they are not riding on the edge, to give them the ability to maybe seat across the face faster!
Last edited by TCracingCA; Apr 25, 2016 at 07:49 PM.
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Burning Brakes
Joined: Sep 2009
Posts: 1,124
Likes: 140
From: Western New York
The Wagner pads I used the last time I changed pads came with a stick on insulator that went on the back of the pad. You can also get a permatex blue spray that goes on the back of the pad and does the same thing. The squeal you are experiencing doesn't come from the pad material contacting the rotor. It comes from a vibration between the pad backing plate and the metal pistons in the caliper. The two vibrate against each other and cause a high frequency squeal. If you were as old as me, you wouldn't hear the squeal.
Duane
Duane
Melting Slicks
Joined: Dec 2009
Posts: 3,233
Likes: 657
From: Thunder Bay
If you choose to try putting something on the back of the pads, make sure it is a lubricant and not an adhesive. Anti squeal compound is usually an adhesive. As the pads move slightly when applied, and adhesive will cause the pistons to rock in their bores, eventually taking out the seals. A little grease on the back of the pads can help reduce the vibration between the piston and the pad that can cause squealing. I have used Never-Seize with mixed results. fact is, some pads nowadays simply squeal. Its a function of the material they are using. traditionally brake pads were made with asbestos. That stuff was always quiet. Now they use ceramics, and metals, and all kinds of stuff. Some of it squeals. You may need to try a different set of pads.
Thread Starter
Instructor
Joined: Mar 2013
Posts: 180
Likes: 21
From: Chesterfield Mo
Pads are new. Came with the calipers from Lonestar. Seems like they had a Teflon type pad of some kind on the piston side.
Reused old rotors after roughing surface with DA sander. Checked runout with dial indicator. Was in spec.
Made several stops from 50-60 MPH to bed pads to rotors.
Reused old rotors after roughing surface with DA sander. Checked runout with dial indicator. Was in spec.
Made several stops from 50-60 MPH to bed pads to rotors.
Team Owner
Joined: Sep 2002
Posts: 38,360
Likes: 2,085
From: California
Now guys I usually read the threads, when I do read them very accurately
Therefore I think I had better get more technical here!
Ok the thread is about squeal, and that is pad to rotor!
And squeak is pistons to pads!
Ok the thread is about squeal, and that is pad to rotor!
And squeak is pistons to pads!
Last edited by TCracingCA; Apr 25, 2016 at 11:57 PM.
Is my vette stock?? HAHA
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From: Im not allowed to tell you
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Use the anti squeal lube on back of pad. Cheapest easiest solutions first
Team Owner
Joined: Sep 2002
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From: California
My mission now is to change one enthusiasts perspective at a time
Use the anti-squeak lube and not the anti-squeal lube for that application!
Sorry LOL
Last edited by TCracingCA; Apr 26, 2016 at 02:42 PM.
Le Mans Master
Joined: Aug 2005
Posts: 6,541
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From: Temple Terrace Florida
Brakes
If you have bedded in the brakes and applied the anti-squeak pads on the back of the discs, try putting a small bevel around the outside edge of each disc. I use a file. I would not add grease to any part of the caliper or piston back. It will melt and cause problems. Likewise I would not use a sander or sandpaper on disc pads. You can embed sand from the paper into the disc and ruin your rotor. It is OK to sand down or break the glaze on a rotor as long as you thoroughly clean the rotor with brake cleaner. Good luck. Jerry
Team Owner
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From: California
I have J-56 phenolic insulators on my cars
So stock not my cup of tea!
But I don't see a problem using these lubes on the backs because that is what is done on these new cars without problems! Naturally you want to use it in the proper amount and keep if to the backs of the pads! I use a bench grinder and a stone wheel to hit my pad edges for a split second of beveling!
But I don't see a problem using these lubes on the backs because that is what is done on these new cars without problems! Naturally you want to use it in the proper amount and keep if to the backs of the pads! I use a bench grinder and a stone wheel to hit my pad edges for a split second of beveling!
Is my vette stock?? HAHA
Joined: Oct 2015
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From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
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http://www.ebay.com/itm/Permatex-241...679451&vxp=mtr
http://www.amazon.com/s?ie=UTF8&page...0anti%20squeal
Anti Squeal
Last edited by Rescue Rogers; Apr 26, 2016 at 06:18 PM.
Team Owner
Joined: Sep 2002
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From: California
Yep even some marketing genius at Permatex gets it wrong!