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Go Back   E46Fanatics > Tuning & Tech > Suspension & Braking

Suspension & Braking
Have some questions about suspension or brake setups for your E46 BMW? Get all your answers here!

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Old 01-09-2013, 08:19 AM   #21
BMWCaptain
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Can you do a test for us? Can you rebuild your caliper first to see if it is your caliper differences? If that does not fix the twitch, then you can replace your lcab.

It would be a good way to find out what really causes the twitch.
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Old 01-09-2013, 02:02 PM   #22
aahmed2016
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I would say either front Control are bushings (FCABs) or the front passenger rotor is warped (uneven wear) Good luck dude
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Old 01-09-2013, 09:44 PM   #23
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Originally Posted by BMWCaptain View Post
Can you do a test for us? Can you rebuild your caliper first to see if it is your caliper differences? If that does not fix the twitch, then you can replace your lcab.

It would be a good way to find out what really causes the twitch.
I think the twitching was caused by the rebuilt brake caliper. The FCABs aren't likely to cause the sudden twitch and thump noise, especially when stopped. And the pulling is probably because of the rebuilt brake caliper as well.

I guess the grease I used for the piston when rebuilding the caliper wasn't good and messed with the how it operates. That's what I believe is causing the piston to suddenly move instead of pressing and retracting smoothly.

It seems it's a coincidence that the FCABs are out, they might have been out for a while now but this problem led me to checking them. The way they look though is strange, looks like the rubber on them has melted.

I'm still working on everything and I'll try to keep updating.
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Old 01-13-2013, 10:46 PM   #24
JokerElite
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Replaced and FCABs and rebuilt both calipers. Although one of the FCABs was out, it didn't cause any noticeable problems. But it's still good they were both replaced anyway as maintenance. The caliper was most likely causing the twitch and the pulling. Or the piston in particular.

It was probably doing this because of the lubricant I used when originally rebuilding one of the calipers. Could have caused the piston to not function smoothly. Or upon disassembling that caliper, when I removed the gasket/o-ring and compared it to a new one it was bigger in diameter. It wasn't that size when previously rebuilding it. Not sure how the size changed but that could have been causing an interference to the piston's operation.

Thanks for the help everyone!
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Last edited by JokerElite; 01-13-2013 at 10:47 PM.
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Old 01-13-2013, 11:01 PM   #25
BMWCaptain
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Originally Posted by RayPooley View Post
No its not. Check out his passenger side FCAB in the vid above.
I guess it was the caliper and not the fcab causing his twitch.
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