I have a 2009 MDX that was vibrating when braking at high speeds. You could definitely tell it was coming from front driver side. Replaced both front rotors and problem went away for about 4 months, and now the issue has returned.

When I pulled the rotors, it wasn't obvious that they were warped. Checked out the pads and regreased the calipers at the same time. Nothing looked bad to the naked eye.

I'm thinking the caliper might be hanging up but wanted to get some thoughts of more seasoned experts.

Seems like a stuck caliper issue. Does it pull to that side during driving or under braking?

Do you have a IR temp gun you can shoot on the caliper and rotors after driving?

Average Joe said:

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I have a 2009 MDX that was vibrating when braking at high speeds. You could definitely tell it was coming from front driver side. Replaced both front rotors and problem went away for about 4 months, and now the issue has returned.

When I pulled the rotors, it wasn't obvious that they were warped. Checked out the pads and regreased the calipers at the same time. Nothing looked bad to the naked eye.

I'm thinking the caliper might be hanging up but wanted to get some thoughts of more seasoned experts.

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Did you replace the pads at the same time? I've run into this before due to how the friction material had worn on the pads. It deposited material on the rotor in a weird way that caused a vibration.

I think actual warped rotors are pretty rare these days

txyaloo said:

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Average Joe said:

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I have a 2009 MDX that was vibrating when braking at high speeds. You could definitely tell it was coming from front driver side. Replaced both front rotors and problem went away for about 4 months, and now the issue has returned.

When I pulled the rotors, it wasn't obvious that they were warped. Checked out the pads and regreased the calipers at the same time. Nothing looked bad to the naked eye.

I'm thinking the caliper might be hanging up but wanted to get some thoughts of more seasoned experts.

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Did you replace the pads at the same time? I've run into this before due to how the friction material had worn on the pads. It deposited material on the rotor in a weird way that caused a vibration.

I think actual warped rotors are pretty rare these days

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I did not. They looked fine, but I'm by no means an expert. I have an extra few sets of pads, so I'll swap those and see.

Flaith said:

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Seems like a stuck caliper issue. Does it pull to that side during driving or under braking?

Do you have a IR temp gun you can shoot on the caliper and rotors after driving?

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If it pulls, it's not noticable at all. Definitely not while driving.

No IR gun, but I could probably scrounge one up. I assume it would run significantly hotter than the other front?

Average Joe said:

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I have a 2009 MDX that was vibrating when braking at high speeds. You could definitely tell it was coming from front driver side. Replaced both front rotors and problem went away for about 4 months, and now the issue has returned.

When I pulled the rotors, it wasn't obvious that they were warped. Checked out the pads and regreased the calipers at the same time. Nothing looked bad to the naked eye.

I'm thinking the caliper might be hanging up but wanted to get some thoughts of more seasoned experts.

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Are you greasing the caliper PINS?

1agswitchin4lanes said:

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Average Joe said:

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I have a 2009 MDX that was vibrating when braking at high speeds. You could definitely tell it was coming from front driver side. Replaced both front rotors and problem went away for about 4 months, and now the issue has returned.

When I pulled the rotors, it wasn't obvious that they were warped. Checked out the pads and regreased the calipers at the same time. Nothing looked bad to the naked eye.

I'm thinking the caliper might be hanging up but wanted to get some thoughts of more seasoned experts.

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Are you greasing the caliper PINS?

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Ha, yes, that's what I mean by that.

Found the issue.

There are two pistons on the front calipers. Pulled the break pads and pushed the brake once. One piston moves, other doesn't. I can get it to push back in the little bit it is stuck out, but definitely not able to move as intended.

If the pistons look fine, clean them and repair kit? Or is it likely to keep getting stuck?

I would just replace it. Rock Auto has them for 100 new.