As seen on: http://www.mityvac.com/brakebleeding1.html

Q: What is the proper sequence in which to bleed my brakes when using the MityvacŪ pump for vacuum brake bleeding?

A: When using the vacuum bleeding method to bleed brake systems on vehicles which are rear wheel drive the sequence should start with the wheel closest to the master cylinder and end with the wheel which is farthest from the master cylinder.

Example: LF wheel, RF wheel, LR wheel, RR wheel

Haynes Manual page 168 (8) says: "11. The primary (front) and secondary (rear) hydraulic brake systems are bled separately. Always bleed the longest line (furthest away from the master cylnder) first.

Which one will you follow? This is a DIY'ers nightmare!