Ecoboost Performance Forum

Ecoboost Performance => Troubleshooting, Maintenance, TSB Articles => Troubleshooting => Topic started by: 14SHOCAR on December 18, 2016, 10:39:08 PM

Title: Horrendous Rear Break Noise in Reverse - 2017 MKZ
Post by: 14SHOCAR on December 18, 2016, 10:39:08 PM
Well -- here we go. First documented problem with the MKZ. We got hit by some major snow this weekend. I was out driving my car to run a few local errands, and I parked the car in our indoor heated garage. A few hours later (after the snow had melted off my car + wheel wells), I leave to run a few more errands. When I put the car into reverse, I get the following squeaking noise:

https://youtu.be/NnLHFQOQ0Ig

I drove forward before taking the video to see if maybe the rear brakes were stuck somehow. It rolled forward perfectly, without any brake noise. I then put it in reverse and took the video. The feeling in the wheel was almost like the emergency brake was on -- but you can tell that when I let off the brake, It doesn't squeal. I put the car into park and looked at my rear brakes and they weren't rusted or didn't have any snow or ice on them.

It's was very strange. After I drove forward around the block, I didn't have any issues with the reverse squeal nor has it come back. Any ideas?????

Title: Re: Horrendous Rear Break Noise in Reverse - 2017 MKZ
Post by: derfdog15 on December 18, 2016, 10:42:58 PM
My mustang typically does this when things get cold/wet and it sits for a bit. No visible signs of rust, but a bit of squeel, which goes away after the brakes have heat cycles a bit.

My best guess is that temperature causes some weird expansion/compression somewhere, that is fixed after heat cycling. I have not noticed this type of thing on my SHO, but it has been a while since it has sat outside in any type of adverse condition.
Title: Re: Horrendous Rear Break Noise in Reverse - 2017 MKZ
Post by: 14SHOCAR on December 18, 2016, 10:44:33 PM
Quote from: derfdog15 on December 18, 2016, 10:42:58 PM
My best guess is that temperature causes some weird expansion/compression somewhere, that is fixed after heat cycling. I have not noticed this type of thing on my SHO, but it has been a while since it has sat outside in any type of adverse condition.

I know, I've had this issue too with previous cars. The vibration and sound was VERY loud -- louder than usual.
Title: Re: Horrendous Rear Break Noise in Reverse - 2017 MKZ
Post by: SHOdded on December 18, 2016, 11:17:33 PM
How many miles on the MKZ?  Are the brakes bedded in yet?  Probably slide pins need lubed.
Title: Re: Horrendous Rear Break Noise in Reverse - 2017 MKZ
Post by: 14SHOCAR on December 18, 2016, 11:19:45 PM
Quote from: SHOdded on December 18, 2016, 11:17:33 PM
How many miles on the MKZ?  Are the brakes bedded in yet?  Probably slide pins need lubed.

About 700 Miles. Good call on the pins.
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