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You can try to do a ABS system bleed two or three times and that might fix it. It sounds like air is trapped in brake lines. You will have to use a laptop and scantool software like FORScan.
The best way to refill the PS system after hose, pump, steering gear, etc replacement is:
Fill reservoir.
Start engine for 5 seconds and shut it off.
Refill Reservoir.
Repeat ^^^^ until reservoir stays full.
Then, turn steering wheel 1/8 turn and refill reservoir.
Continue ^^^^^ until reservoir stays full with lock to lock turns.
Not doing this pumps aerated fluid through the system and is damn near impossible to get out.
@SkySkiJason When turning the wheel 1/8 turn and then lock to lock turns, is this with the front end on jack stands with the wheels/tires off the ground?
@SkySkiJason When turning the wheel 1/8 turn and then lock to lock turns, is this with the front end on jack stands with the wheels/tires off the ground?
It makes it a lot easier to turn!!!
But, I don’t think it’s required.
I forgot to add pressing the brake pedal after the steering stuff above.
The idea is to never let the reservoir run dry and create that frothy stuff. That entrained air is hard to separate.
yes when turn the brakes work perfect that’s what has me confused
My theory is the spool valve in your hydroboost is not redirecting hydraulic fluid flow into the hydroboost's piston chamber like it should. When you are driving straight and apply the brakes, there is insufficient hydraulic pressure in the hydroboost to operate the brakes properly. When you turn the wheel, the rotary valve in the steering gear redirects hydraulic flow, causing hydraulic back pressure to the hydroboost thus allowing your brakes to operate (somewhat) normally.
As for why the spool valve in the hydroboost is not doing its job, it could either be damaged or contaminated. Did you blow the new hoses out with air before installing them?
This is my best guess based on working several years in the hydraulics industry but not being the engineer that designed this system.
My theory is the spool valve in your hydroboost is not redirecting hydraulic fluid flow into the hydroboost's piston chamber like it should. When you are driving straight and apply the brakes, there is insufficient hydraulic pressure in the hydroboost to operate the brakes properly. When you turn the wheel, the rotary valve in the steering gear redirects hydraulic flow, causing hydraulic back pressure to the hydroboost thus allowing your brakes to operate (somewhat) normally.
As for why the spool valve in the hydroboost is not doing its job, it could either be damaged or contaminated. Did you blow the new hoses out with air before installing them?
This is my best guess based on working several years in the hydraulics industry but not being the engineer that designed this system.
the thing is I’ve changed the hydro boost out also and still have the same problem
