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      11-04-2019, 03:24 AM   #6
stevesingo
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Drives: E90 330i MSport 6MT
Join Date: Feb 2014
Location: Cumbria

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Quote:
Originally Posted by juld0zer View Post
This is an old thread I know, but did you resolve it?
It sounds like pad knockback if you can induce it by rocking the steering side to side but usually occurs on a long/fast corner.

Are the lines of ample length and not too short/too long?
This. Flex in the hubs under lateral load (more so when running sticky track tyres or slicks) cause the discs to run off centre and push the pads back. When then the load is removed, there is a gap which means you have a long travel on the pedal at first push.

To confirm, try dabbing the pedal whilst accelerating after the preceding corner on the straight. If the pedal is good in the next breaking zone, it is pad knock back.

You can fit anti knockback springs or residual pressure check valves to minimise the effect.
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