Re: Best tire inflator?
Reply #17 –
My D2 was original and oil soaked and would intermittently not re-engage at the low set point and continue to drop until the spring safety chambers locked up the rear axle brakes .
The meritor disk brakes are cold blooded by nature as they were designed for much heavier equipement than ours.
Higher initial application pressure definitely helps the initial braking. Especially if you have turned off the trans retarder both to warm up the disks during a drive and to lessen the hard retarder slow down at low speeds at which the rotor speed is lower and the baking effect lessened.
Someone posted a chart here showing the different D2 rates available a while ago and what use they were intended for.
S-cam drum brakes are somewhat self energizing from the primary/secondary shoes effect as far as I knew.
The disks are not and require higher air pressure to work safer IMO.
Probably why the original U300 1988 unihome had a std retarder. The brakes being cold blooded and if memory serves me had a lower pressure D2 valve.
My two cents.