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Discussion Starter · #1 ·
I'm new to the forum and to the MDX, this is our first one... 2020 SH-AWD Tech. I did quite a bit of research before settling on the MDX and we really like it, other than the old technology, but not a big deal to us. We've had it about 3 weeks now and it was certified pre-owned by Hendrick Acura in Durham, NC (which doesn't mean much). We drove it to Boone last week to see our son and on the way back down the mountain, there was some brake shimmy and vibration like the rotors were warped. With 37K on it, and having read that the factory rotors are prone to warp, I decided to replace the front rotors and pads know full well that the dealership would just turn the rotors and I would be back to square one in a couple of weeks.
So I settled in and knocked them out today. It was a very easy job to do, but once I pulled everything apart, I noticed that both calipers had a build up of grease around each cylinder.
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So I cleaned both of them up before reinstalling them. I didn't know if anyone has experienced this before when changing out brakes. I don't believe this to be normal and I'm not even sure these are the factory calipers since it was pre-owned. Here is photo of the back of the caliper.

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Here it is after cleaning it up. Thanks for any insight you veteran MDXers can provide... Dave

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I didn't have any grime issue like that on my 2014 MDX when I replaced the rotors/pads (myself) at about 70K miles in order to get rid of excess braking shimmying like you described on yours. I went with aftermarket rotors (since the OEMs were what I was feeling with the shimmying) and OEM pads, since they were lasting a surprisingly long period of time.

As to the excess grime on your calipers - it's hard to say why it's there. Maybe it's just due to a lot of road gunk in your area or maybe a prior owner or mechanic, or low level brake swapper, applied grease there which in turn attracted dirt and grime.

It looks like you did a good job of cleaning it out. It's worth a check in 6 months or so to see if they're staying mostly clean or if they're gunking up again.

At just a couple years old an 37K miles I'd be surprised if it had a brake job prior to what you did so it's likely mostly road gunk. I live in San Diego so we have almost no road gunk due to no snow and little rain but if you live in the rust belt there's all kinds of gunk and corrosion going on there.

Another possibility - grease being thrown at it from a torn CV axle boot. I assume you checked those since you sound pretty savvy on auto mechanics.
 

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Discussion Starter · #3 ·
Thanks for your reply MDXstang. I did check the CV boots, brake lines, and anything else that could have created that mess. It may just be that it was like that from the factory, just had never seen that before.
 

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If it was grease it would have made the dust boots swell up and they would be distorted since they are not compatible with petroleum based fluids. It looks like a synthetic grease was used on the face of the caliper. Did you notice any grease on the brake pads? Here is what I use on all contact areas on the brake pads and calipers and I have never had a brake squeak issue when I have used it: https://www.amazon.ca/Permatex-2412...locphy=9000000&hvtargid=pla-571820984777&th=1
 

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Discussion Starter · #6 ·
Thanks Ebonygraph. That's what I really thought it was. But it was probably just a squeak solution like YYT described. I personally don't lube anything but the end of each brake pad so it slides well. I have never lubed the back of the pad.
 
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