Big Blue: 2005 GMC Yukon Denali

[Senor_Taylor]

I looked up some threads on Hydroboost real quick and it basically seems like you are on the right track. Bleeding it seems pretty simple:

1. Replace any hydraulic line showing external damage. Rubber hoses more than 4 years
old should be replaced. Install new seals for all disconnected fittings (as required) and
install an in-line power steering filter. Tighten all hose fittings to OE specifications.
2. Flush the entire power steering system using the vehicle manufacturers recommended
fluid. Fill pump reservoir to the proper level.
3. Disable engine to allow cranking without starting. Block wheels, put transmission in
neutral or park and set parking brake, then crank engine 5 to 10 seconds (avoid
overheating starter motor).
4. Refill pump reservoir as necessary. Repeat step 3 until level is correct.
5. Enable the engine to allow starting. Start engine and let idle. Slowly turn steering wheel
from lock to lock a number of times.
6. Turn engine off and inspect fluid level and condition. Add or remove fluid as necessary. If fluid
is foaming, wait one hour then recheck level. Repeat step 5 and 6 until fluid level is correct
and shows no sign of air. If the problem persists recheck installation and connections.

1. Replace Hoses
2. Bleed system