I suppose you could argue that Newlands Pass (AKA Newlands Hause) doesn't begin until you reach the point where the road steepens and leaves the valley behind at or about Keskadale Farm. However, because the valley itself is is an absolute delight, rightly or wrongly, I've indicated the start point of the pass at Braithwaite.
As I've said, Newlands Valley is a delight, and while not lacking in drama altogether, the Buttermere side of the pass offers much more in the way of mountainous scenery. Scenery which the early tourists found quite overwhelming and even frightening. In the days of the hose drawn carriage tours around the Lake District a stop off would be made to see Moss Force waterfalls found at top of the pass. This was also used as a resting point for the horses. The difficult thing for us to imagine is that paying passengers were expected to walk up the steeper sections of the pass, and if the horses were struggling, they even had to help push the carriage.