Do you need to drain all 4 calipers for brake fluid flush?

[Gros Ventre]

The above does seem odd. The standard practice is to bleed the caliper farthest from the reservoir, then the second farthest, then the third farthest, and then the nearest to the reservoir. If they had followed that then the rest of the system would have been replaced with fresh fluid. Having done this on other trucks I owned, I don't think the clean caliper tells you much. However the bleed screw should show evidence of operation. Did they replace brake pads? Or inspect the discs? How about the condition of the brake hoses? Seems odd that these weren't mentioned. Unless you have a reason for flushing, not doing these other parts of the system I believe to be a failure on the techs part. In my observation rubber hoses, and particularly ones that have significant pressure applied, should be replaced about every 5 years.

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