Quote:
Originally Posted by PhaceN52
This may sound and probably it's stupid, but if everything has been replaced with assuming good parts, could be a problem related to the caliper carrier? After a lot of heat cycles of cold/hot/cold, could this over time "relieve" some stress in the metallurgy of the carrier leading to a slight twist/torsion (tenths of a millimetre / 0.004 inches) that leads to the guide pins not being perfectly parallel between each other or between the carrier and the disc and so making the brakes shake?
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this is exactly what I had on my audi with those 6 piston BBK.
The vibration was very very similar to a cellphone in your pocket, quick but smooth vibration, not heavy.
It happened only when hot, like after a mountain driving with heavy slopes.
When cold all good. So my assumptions were the fluid was boiling, until I hand touch the caliper after a rough ride, and they were warm. No way the fluid can boil.
One day I got heavier vibrations noise and noticed the caliper was moving.
In deed, it was the aftermarket studs under heat , got longer and the caliper became loose. They are made for heavy use, and used for brembo BBK conversion by many driver...
re-torque, then blue Loctite. did not worked.
I simply used red Loctite and over torque those stud, for now all good, if it ever come back, no choice to replace those studs.