Mayoisthedevil
Junior Member
For the past two months I've had issues with shudder/vibration under braking from the front end. The shudder and vibration started after having the wheels powdercoated, and now it has become progressively worse to the point where I feel like I'm one of those mechanical bulls.
A friend had a good suggestion to check the mounting surfaces for the brake discs and sure enough there were gobs of paint build up on them. The paint was so thick it was preventing the disc from mounting flat. I sanded off the paint, and now the disc mounts properly on the wheel. I can't believe I didn't notice this when I got the wheels back. Prior to powdercoating I had rattle canned the wheels myself, and I had the foresight to tape the mounting surfaces. Just goes to show you always have to double-check.
Unfortunately, the vibration is still present, and I discovered a second issue with my calipers. The seals are actually coming out of the bore past the cylinders. I have to think this is what's causing the vibration, but I won't know for sure until I rebuild the caliper next week (waiting on seals).
I've also checked the wheel bearings (they're new after powdercoating), and I checked the disc thickness with a digital caliper. I don't have a dial indicator to check runout, but I find it hard to believe that the disc is bad after 21k miles.
Has anyone seen or heard of a vibration caused by this type of issue/damage to the caliper seals?
A friend had a good suggestion to check the mounting surfaces for the brake discs and sure enough there were gobs of paint build up on them. The paint was so thick it was preventing the disc from mounting flat. I sanded off the paint, and now the disc mounts properly on the wheel. I can't believe I didn't notice this when I got the wheels back. Prior to powdercoating I had rattle canned the wheels myself, and I had the foresight to tape the mounting surfaces. Just goes to show you always have to double-check.
Unfortunately, the vibration is still present, and I discovered a second issue with my calipers. The seals are actually coming out of the bore past the cylinders. I have to think this is what's causing the vibration, but I won't know for sure until I rebuild the caliper next week (waiting on seals).
I've also checked the wheel bearings (they're new after powdercoating), and I checked the disc thickness with a digital caliper. I don't have a dial indicator to check runout, but I find it hard to believe that the disc is bad after 21k miles.
Has anyone seen or heard of a vibration caused by this type of issue/damage to the caliper seals?