135i front brake caliper bolts - 10mm HEX or Torx T55?

[Katkarot]

Help guys,
On many DIY for 135i and E90 front brake pad change, they said to use 10MM HEX/Allen key to remove the caliper bolt.

When I tried 10mm HEX key, it doesn't go in. But I got a T55 and it fits and I also noticed the star indents too.

Any body got technical specs on the front Caliper bots? Is it 10mm HEX or Torx T55? I don't want to strip it by using the wrong size tool.

Thanks in advance

http://www.1addicts.com/forums/showthread.php?t=263962

[MDORPHN]

1Ms have different calipers than 135s so you're unlikely to get an answer here.

1Ms have the same brakes as E9x M3s.

Neil