tdskip;

I agree pressure bleeding, implemented right* is a good thing, but unless you are using DOT5 fluid, don't be cheap and "save fluid"...replace fluid totally every two years...BF BP decreases as it absorbs moisture...and it is contantly and always will...as a general rule, release enough fluid through each corner when bleeding, until it comes out clean...then you know you have:

1. Replaced with new fluid along the ENTIRE path, and
2. Removed all air (which is kinda the point).

* There is nothing inherently wrong with using spare tire as a pressure source...but it would have to be limited and controlled with a regulator or it will cost you it's inflation, and as I belive you mentioned is too much pressure if not dropped...this does remind me of VW using it as the pressure source for the windshield squirter bottle in the Bug, but this could only work with an owner who would check an top up the spare tire pressure as well as the windshield washer reserviour at each fill-up (not that big a deal when ALL those items were located under the same hood).

Cheers