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Old 04-02-2014, 01:21 PM   #1
focusETSzx4
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Possible front brake issue........?

Hey guys!

So I just put new pads on my car Monday and had my rotors machined down. Probably has no relevance to my situation since I had the same problem before I replaced my pads.

But... I have noticed that since I bought the car I hear this knocking sound when I put my car in reverse and hit the brake pedal. Part of me is thinking possibly a brake pad is loose or someone else suggested possibly a motor mount. It only does it when my car is in reverse however, any other gear And everything sounds fine on it. Help! lol


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Old 04-02-2014, 01:27 PM   #2
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On the topic of the motor mount, how many miles are on your car and have the motor mounts ever previously been replaced?
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Old 04-02-2014, 01:36 PM   #3
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I have about 108,000 on it now. I'm a second owner so I'm pretty sure the motor mounts have never been changed... Although the car was well maintained so it's a possibly but not entirely too sure
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Old 04-02-2014, 01:52 PM   #4
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Quote:
Originally Posted by focusETSzx4 View Post
I have about 108,000 on it now. I'm a second owner so I'm pretty sure the motor mounts have never been changed... Although the car was well maintained so it's a possibly but not entirely too sure
I would definitely get at least the passenger side motor mount replaced then. They're known to go bad at around 50k. I have 54k on my 2009 and I'm already noticing excess vibration.
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Old 04-02-2014, 03:04 PM   #5
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A good way to check the mounts is put your car in gear then hold brake and hit the gas. Not hard enough to make the car move, just hard enough to stress the powertrain and make it rock back and forth. Then try Reverse. If it makes that noise in drive or reverse you wanna look at mounts. This happened on my passenger mount.

Otherwise, you could have a friend try to make the noise driving the car and you could stand outside and try to listen for the sound and follow it to its source. Just don't crawl under the car with it in gear.
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Old 04-02-2014, 03:38 PM   #6
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I will try that thanks.
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Old 04-02-2014, 04:05 PM   #7
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alot of cars have a mild clunk in reverse as the pads re-seat from the change in direction. If you're concerned about it, double-check that the pad retainer clips are properly installed, and check that the caliper hardware is secure (some folks overtorque the guide pin and strip the knuckle threads).
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Old 04-11-2014, 11:50 AM   #8
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alot of cars have a mild clunk in reverse as the pads re-seat from the change in direction. If you're concerned about it, double-check that the pad retainer clips are properly installed, and check that the caliper hardware is secure (some folks overtorque the guide pin and strip the knuckle threads).

Well I took my wheel off today after work to investigate. As far as I can tell, everything is seated properly, retainer clip is on properly. I noticed Ford uses almost a floating design on these types of cars, which kind of makes it a pain in the ass to diagnose a problem.

Before, when I first got the car, it would make a clink sound, when in reverse... sounded like the pads were knocking the rotor really hard or something. I just recently changed hardware and my front pads and had my rotors machined down. Now I get a THUMP when I apply my brakes at low speed.

I searched on google and found that this is a common problem with Infinities. However, my ford didn't do it until I had my brakes done. It's pissing me off ><
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Old 04-11-2014, 01:26 PM   #9
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If the noise is from the front, might look close at the pad to holder fit. That's what limits the pad's movement front to rear - caliper isn't involved in that.
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Old 04-11-2014, 01:33 PM   #10
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Does the knock continue in reverse almost like its rotational? Or while reversing can you induce the noise with every press of the brakes?

If so I'm betting you have drum rear brakes and the star adjuster in the drums is frozen. The adjustment rod is skipping over the start adjuster causing a clicking/ clunking noise.

But if you're 100% percent certain it's coming from the front, when you did the front brakes did you verify all the slide pins moved freely?
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