The UK version of the IH Service Manuals in PDF format are available at the link below. There are some differences on the Louisville, KY, USA assembled tractor from the UK versions but the brakes are the same. The 464 is same as 454 with just about 5 more HP. Section Group 8 starting on Page 97 gives explanation of how the brakes work and how the hydraulic return oil from the oil cooler is used to feed the master cylinders, there is a screen and orifice in the hydraulic feed line to each master cylinder. IIRC very early IH 54 series tractors did not have the orifice in the feed line and that caused the problem you described. The other problem can be too much flow in the hydraulic oil cooler return line and there is a flow measurement for that.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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