not sure if this happens on all the the different years
when my power steering pump failed 2 winters ago & when it died so did my braking. all of this just moments after coming off a steep decline out of the woods
I'm not sure with the GMT 800's, but with the older hydroboost units, they contained a nitrogen charge that would allow for three complete stops should the Power Steering pump dies. But yes, technically once you loose PS pressure, the hydroboost unit will no longer apply pressure to your brakes.
can you enlighten me on exactly what hydroboost advantages are over stock? I've always heard and seen it done but i have no idea exactly how it helps? thanks
Vacuum brakes on our rigs apply ~800psi at the caliper; hydroboost is ~1200psi.
Essentially, you are utilizing hydraulic pressure from the PS pump (always use either a 3/4t or 1t PS pump, the 1/2 is not correct), through the hydroboost to dramatically increase pressure at the caliper - Sunlit, did I get the basics right??
The plus's of hydroboost is dramatically increased clamping pressue which will reduce your 60-0. However, they are prone to failure (fellowtravelers comments) due to the smallest of particles ripping through the seals of the hydro unit and a bit more complex then vacuum setups. There are two companies that make filters (not OEM) for the low pressure side I've seriously considering adding to see if that would help.
However, for me, I like the unit esp b/c I'm running bigger tires and tow from time to time...but it's an expensive mod.
I can definitely add more details if you have questions!
Edited by Sparg93, 16 October 2012 - 09:13 PM.