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[richgilb]

Are they belts or chains?

[Brabs]

All forfours are chain... except the Brabus.

 

[mr singh]

all but the brabus require there valve clearances checking every 50-60,000 miles aswell

[kanapa1]

all but the brabus require there valve clearances checking every 50-60,000 miles as well

Valve clearances

[CrazyG]

Kanapa1...
mr singh meant that all non Brab ForFour's require the
valve clearances to be checked adjusted (if necessary) every
50-60,000 miles. 
Anyone with a Brab knows the clearances on them are adjusted by
using different thickness shims inside the inverted buckets that sit
on the top of the valve stems.