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Unread 04-19-2014, 07:39 AM   #1
daveyboy43
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Rear brake issues

My son in law recently replaced the rear pads and rotors and adjusted the parking brake on his 08 Grand Cherokee. This was done 3 to 4 weeks ago. Since then the rear brakes have started making noise and now they are squealing loudly everytime the brakes are applied and it's very annoying not to mention everyone kind of gives you that look as they think get your brakes fixed. He's bringind down for me to look at and hopefully get this solved. Should he have applied something to the back of the brake pads like disc brake quiet or something else? Should I even bother looking at the possibilty that he over adjusted the parking brake or is that even possible? Those are the 2 things I was wondering about but please any and all suggestions are gratefully welcomed as I would like to solve this for him but don't have all day to spend on it. Thanks in advance to anyone offering help.

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Unread 04-19-2014, 08:50 AM   #2
JeepN4KC
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Trying brake quiet wouldn't hurt anything. If it were the parking brake I'd think it would be noisy all the time.

Might just have some crud between the rotor and pad from tear down rebuild.
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Unread 04-19-2014, 10:03 AM   #3
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Take it all apart, clean everything. Put some disc brake lube on the pads. Were the rotors machined? That could be part of the culprit. If the pads are glazed from improper break-in they will chatter and make all kinds of racket. You can also use a belt sander or sanding block to chamfer the leading edges of the pads. Use the same sanding block to put some crosshatch on the rotors. Just a few ideas.
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Unread 04-28-2014, 05:50 PM   #4
daveyboy43
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The brakes and rotors are both new. I took everything apart and cleaned everything and applied disc brake quiet. Everything was fine for about a week and now the squealing has come back. We also notice a rubbing noise that is noticeable when you slow down and turn the wheel and we're not sure what's going on.
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Unread 04-28-2014, 06:17 PM   #5
JRLT
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Were the brakes broke in?
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Unread 04-28-2014, 07:11 PM   #6
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What do you mean by broke in?
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Unread 04-28-2014, 10:30 PM   #7
JRLT
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Bedding in...

Anytime you install new brake rotors, brake pads, or both, it’s advantageous to bed in your new brakes. Bedding in your brakes is just an industry term to explain breaking in your new brakes. Bedding in your brakes helps transfer an even layer of brake pad material onto the brake rotor which assists in smoother brake operation and improved braking power.

Having a uniform layer of pad material on the brake rotor is essential to minimizing brake squeal and vibration. For this procedure, you will need a good stretch of road and no traffic.

Use common sense and take precaution as BrakePerformance does not take responsibility for erratic driving, accidents, or damages done.

Note: When using Brake Performance E-Coated/Zinc-Coatedrotors, drive around normally and use the brakes until the friction contact surface is wiped clean of the coating prior to this procedure.

Perform 3-4 medium stops from 45mph. Slightly more aggressive than normal braking. You don’t need to come to a complete stop for each pass. This brings the brake rotors up to temperature so they are not exposed to sudden thermal shock.
Make 8-10 aggressive stops from 60mph down to 15mph. For this set of semi-stops, you want to be firm and aggressive, but not to the point where ABS activates and the wheels lock up. It’s important to note that you don’t come to a complete stop but rather a semi-stop (~15mph). Accelerate back up to 60mph as soon as you slowed down to your semi-stop.
The brake pads and brake rotors are extremely hot at this point and sitting on one point will imprint the pad material onto the surface unevenly. This can cause vibration and uneven braking.
You may notice that your brakes will start fading, and sometimes smoke, after the 6th or 7th pass. This fade will stabilize and will gradually recess once your brakes have cooled down to normal operating temperatures. Drive carefully as your brakes may feel softer for the next few minutes.
Try not to come to a complete stop and find a stretch of road where you can coast for 5-10 minutes, preferably without using your brakes.

After the break-in procedure, there may be a light blue tint on your brake rotors as well as a gray film deposit. The blue tint shows that your rotor has reached the appropriate temperature during the bedding process, and the gray film is some of the pad transfer material.

Some cars and trucks require two cycles of the bedding in procedure. This may be the case if you are using old brake rotors with new brake pads, or new brake rotors with old pads. This may also be the case if you don’t think you fully heated up the brakes in the initial bedding procedure. In any case, it’s required that you wait at least 10-15 minutes between each cycle as you don’t want them to overlap.

http://brakeperformance.com/bedding-in-rotors.php
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