Im not a Mazda mechanic, but im learning.

[Wain]

Hello, firstly i have a mx5 mk2 engine in my roadster, but no brake servo. On the mx5 it has an air pipe from the brake servo to the engine. As i do not have a brake servo, is it ok to just cap it off or put a small filter on it?
When i was speaking to a chap at Stoneleigh show at the weekend about it, he was saying that it is very important for the 2 to be connected for both the flow of petrol to be correct when braking and the air pressure in the servo to be correct.

Secondly, on the carb i have a small silicon pipe on it which has been cut when the engine was taken out of the car. What is it for and where should i connect it to?