Chevy Astro Pwr Steering and Power Brakes

Driving in the snow.  After a sharp turn, suddenly lost power steering and power brakes in 1999 Chevy Astro.  All fuses seem to check out OK.  Any ideas?

Update to original thread:
After discussing it with Chev Service Dept and a couple other service agencies, it looks as if there wasn't enough room in the '98 and up Astros to install a separate brake unit so those wonderful engineers tied the brake boost system into the power steering pump. If you lose power steering, you no longer have any brakes!
Chev customer service is "checking" on this...

Made a u-turn in a 98 astro van and lost power assist to brakes and steering. Was able to get it going again by tapping on the combination outlet banjo/solenoid valve which has been added in recent years to the Saginaw vane pump which has been used for decades. Be sure to tap on the cast iron part of the banjo (close to where the o ring nut screws in and not on the plastic solenoid).

Went ahead and took off the pump to take a look and see what really caused the problem. Found that the new pintle/solenoid valve can't be taken apart to clean. Also found that the relief piston in the pump is about .1" shorter than it used to be and was installed with a shorter spring. Also the new banjo nose/stop sticks into the piston bore about .1" more than before. Don't know if the piston simply goes deeper into the bore (and gets stuck) when the solenoid valve closes (caused by sharp turn/angle sensor?) or if the solenoid valve is actually the culprit.

Replaced the pump since it was really no more work and very little money. Stay Tuned!

hey man any updates and where is this part located?? just ran into the same prob tonight

quote:

Update to original thread:
After discussing it with Chev Service Dept and a couple other service agencies, it looks as if there wasn't enough room in the '98 and up Astros to install a separate brake unit so those wonderful engineers tied the brake boost system into the power steering pump. If you lose power steering, you no longer have any brakes!
Chev customer service is "checking" on this...

ORIGIONAL quote: HeatDet

the 'Hydra-boost' braking system u r refering 2 has been used for along time before the '98 Astro's. i've seen them all the way back on the first years of production-hell, my father's '78 Pontiac Parisienne (did i spell that right?) wagon had Hydra-boost brakes in it. i agree with u on the thought that the engineer's are absolutely wounderful to have designed a system as important as your brakes, to rely on a belt that could fail.

Yep, just about all deisel trucks have hydro-boost because they don't produce vacume, some of the 2500HD trucks have hydro-boost, and I converted my s-10 to hydro-boost from an astro for tire clearance.

Please help, this happened to me this weekend.  It is very cold wondering if something is frozen.  Where can I find the solinoid valve thingy to tap on.
HELP