Hi guys, I just replaced my actuators & hubs (and rotors) and everything is working as expected.

I've been browsing the IWE threads & see reference to check valves and vacuum reservoirs, I've also seen reference to a vacuum system.

Can someone point me to the next tests I should perform, along with a vacuum diagram?

Before I started today the gears were completely worn out. I want to make sure this repair is done right & that it lasts.

I replaced the actuators & solenoid last year and it worked for about 3 months. This time I replaced the hubs too.

...2006 F150 SCREW, XLT...

 

Should I go ahead & replace the check valves? I haven't found them online at either Autozone or Amazon.

 

I just put the vacuum gauge on it, vacuum went to 15 immediately, crept to 17 psi after about 10 seconds; when I turned the engine off the vacuum held for 9 seconds and then abruptly dropped to zero. Both sides behaved identically.

 

You need to remove the check valves to test them. Try blowing thru them (by mouth) each way. If you can, replace them. These are the valves I used: (2 of these)

(larger valve by the brake booster. I know's it's an AC Delco, but it has worked flawlessly)

 

i used these:

Dorman - Help Vacuum Check Valve - Universal 47149: Advance Auto Parts