The crank case breather hose (CCB) is an odd shaped hose that vents "unwanted" gases from the engine to the air intake plenum above the throttle bodies. It is located above the rear of the throttle bodies.

If the CCB has gone bad and is leaking then the engine will not run as smoothly or efficiently as it should.

As a rubber hose, the CCB is a maintenance part that occasionally needs to be replaced. It's a good idea to check its condition every time that you do an oil change or if a K75 or K100 has been sitting for an extended period of time.

It's also a good idea to occasionally pull the rubber caps off of the throttle bodies and inspect those for drying and cracking.

The BMW part number is 13547694924 (Protection Cap) but any small rubber cap that seals well will work there.

 

 

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