LCAM-01XA
Full Access Member
tbrumm, yes it was exactly during towing (or loaded heavy) when the 1-1/8" master seemed a bit too "soft". Which is weird cause it's not like a '70s Lincoln (hydroboosted from the factory) soft and easy, just didn't seem to modulate pressure well. Had absolutely no problem providing the needed line pressure, just not quite as "touchy" as I'd have preferred it. The 1-5/16" monster on the other hand is extremely responsive, but a bit too firm to push on the pedal. Haven't tried towing with it yet tho, guess the best way to figure out what it does is to hook up to the big trailer and do a few emergency stops...
cpdenton, now you got me curious if for some reason ours isn't just a fitting but an actual valve as well, and thus dropping the line pressure a bit too much for the rears. Shouldn't be, but who knows, I'll dial the pressure up a bit with the adjustable valve and see if things improve. AFAIK the difference between the hydroboost fitting and the standard valve is internal, unless you try taking your factory valve apart it will look just like the hydroboost fitting. I think we have another hydroboost master laying around here somewhere, if I ever find it I'll be sure to compare it to the valve from a vacuum truck. As for the manual valve, it's the standard $35 (or thereabouts) Wilwood-style valve you can buy at Summit - except ours has Ford Racing decals on it. Rated at 3000psi, have used it on other hydroboost systems before, never had a problem.
treeclimberman, you're misunderstanding - the 1-5/16" master is anything but spongy, it was the 1-1/8" master that was a bit meh, and I guess I shouldn't say "spongy" but more like just harder to modulate. No air in either of them, come one man, give us some credit here, this ain't our first rodeo
RABS is not getting bypassed here, ever, that thing is godsend on our winter vacations if the roads are slick and the truck isn't loaded heavy - at over 2000 lbs of weight on each front wheel plus additional weight transfer during hard braking the steer axle has no problem finding traction, but the rears get only like 1000 lbs each to begin with and that drops to even less cause of aforementioned weight transfer - she gets a bit too squirrelly a bit too easy there and the RABS is great for keeping that in check.
cpdenton, now you got me curious if for some reason ours isn't just a fitting but an actual valve as well, and thus dropping the line pressure a bit too much for the rears. Shouldn't be, but who knows, I'll dial the pressure up a bit with the adjustable valve and see if things improve. AFAIK the difference between the hydroboost fitting and the standard valve is internal, unless you try taking your factory valve apart it will look just like the hydroboost fitting. I think we have another hydroboost master laying around here somewhere, if I ever find it I'll be sure to compare it to the valve from a vacuum truck. As for the manual valve, it's the standard $35 (or thereabouts) Wilwood-style valve you can buy at Summit - except ours has Ford Racing decals on it. Rated at 3000psi, have used it on other hydroboost systems before, never had a problem.
treeclimberman, you're misunderstanding - the 1-5/16" master is anything but spongy, it was the 1-1/8" master that was a bit meh, and I guess I shouldn't say "spongy" but more like just harder to modulate. No air in either of them, come one man, give us some credit here, this ain't our first rodeo
RABS is not getting bypassed here, ever, that thing is godsend on our winter vacations if the roads are slick and the truck isn't loaded heavy - at over 2000 lbs of weight on each front wheel plus additional weight transfer during hard braking the steer axle has no problem finding traction, but the rears get only like 1000 lbs each to begin with and that drops to even less cause of aforementioned weight transfer - she gets a bit too squirrelly a bit too easy there and the RABS is great for keeping that in check.
