Originally Posted by acadianbob
I wonder about that. Constant light pressure would generate a huge amount of heat in the brakes. Intermittent applicant of brakes would allow some heat to dissipate.
In the C-130 the technique for taxi down a slope is the opposite.
Let the speed build up to a "run"; then use "reverse thrust and moderate brake" to slow to a crawl and then let the speed build up again.
This allows engine and brake cooling between braking applications.
I use exactly the same techniques when going down long grades; (In Tow/Haul mode) speed no faster than I can get rid of with a smooth firm brake application while in a lower gear.
Going up I use the Tow/Haul mode and maintain towing speed as long as I can keep trans temp below 225 degrees. I slow to maintain that temp in the climb.
Pull over and STOP while idling engine on side of road if trans temp exceeds 250 degrees (Allison Transmission) or engine temp gets too high.
Do NOT shut engine off! The hot turbo/engine will cook your oil fed bearings.
"Heat requires oxygen if the pads or shoes are in contact with the drum or rotors there is minimal O2 between them."
Never heard this; seems to fly in the face of high school physics. Now FIRE requires O2 but heat energy exists in outer space without an atmosphere.
To remove "heat" from a system, a medium with a lower temperature (heat sink or environment) is required to be in contact for the energy to dissipate to. The only available medium in a brake system is air and you need to get it between the pads to cool them rapidly (increased medium to surface contact).
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW