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I drive a 1998 Honda Civic Ex. Lately I’ve been getting a pulsating noise from my passenger side tire during very slow speed braking (like approaching a stop sign)

I had only a couple months back serviced my brakes, cleaning pad ears/brackets, cleaning/greasing slide pins with a silicone grease.

While doing so, I noticed the top pins that had a rubber at the end would go in somewhat tight and when fully compressed would pull themselves out about an inch like a compressed spring being let go.

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I tried cleaning the bracket hole of all grease, but same thing would happen. Tried burping any air by pulling on the dust boot while compressing the pin but nothing helps. It always springs back about an inch and does so slowly.

The bottom pins without the rubber at the end move smooth like they should with no springy action.

Couple questions:

  • Can I simply just remove the rubber piece? What’s it for anyway and why doesn’t the bottom have it?
  • Could I swap pins? (Top to bottom/bottom to top) I noticed in doing so the rubber ended one on the bottom doesn’t spring out, but my car’s service manual shows it goes on the top
  • Why is the top slide pin constantly seizing up if it’s essentially always trying to spring back?
  • I'm not sure, but I suppose the rubber is to make the pin act like a spring/damper system. It's sealed so tight to keep air trapped like you describe, it at least has a spring/damping effect, wether it's intended or not. If intended, I think removing it may cause a little noise increase. If it's working improperly, it can also increase noise. Most odd constructions around brakes are to eliminate noise or NVH as we call it. – Bart Mar 15 '18 at 19:35
  • It seems to be seizing over time and creating a pulsating noise while braking. It’s the only one that seizes every time I check after a month or two of driving – ohmmy Mar 15 '18 at 20:03
  • Avoid swapping the guide pins around, if they're different lengths it can cause binding issues. The rubber bushing is for NVH you can remove it without any real drawback usually. Most likely the pin is pushing out because air is trapped under the pin. When you grease the pin only lightly coat it. Is the pin seizing because of rust or is it because the bushing is swollen? Have you tried replacing it? – Ben Mar 15 '18 at 22:09
  • @Ben What’s NVH? There’s no rust, I haven’t tried replacing the pin no but I do remember about two years ago the driver’s side top pin did not have the rubber. Someone had taken it off so I bought new ones for both sides. However the popping out was still occurring on the passenger side before I replaced the rubber – ohmmy Mar 15 '18 at 22:12
  • NVH = noise , vibration and harshness. How clean is the bore? If you remove the rubber does it slide easily? – Ben Mar 15 '18 at 22:13

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