No ,I hear the spring sound at the front around booster an cylinder as I pump an especially RELEASE the pedal.Its a new sound .
An I did bleed them in that order 2 times all the way around .
I'm leaning toward the master but I'm gonna get another person to put their hand on the booster an listen closely for the new noises an any changes.
I didnt get a colapse in the fluid cap in the past when it all was workingworkin.Also on the front left bleed is when it collapsed again [no driving just pumping to bleed].

 

I merged your two threads together.

You may not get an ABS fault for air in the lines. You likely do need to get a scan tool to properly bleed the system.

 

No worries, best I can do from a thousand miles away. However, the fluid cap rubber seal collapsing down is normal, and I'd have to wonder why it never did before. That's the whole purpose of the rubber seal being shaped as it is, to allow it to collapse down into the reservoir as the fluid level drops. I've never had one not collapse while bleeding, and that's across multiple makes and models.

 

I meant when driving it had been collapsing often.
I put another booster on it an no more squeek or hum noise.!.
Theres still air in the system though but a tad tighter on the pedal.
I guess I'll have to get the scan tool.
to bleed the abs ..

Should I look at testing/replacing the master ?

 

It sounds like air got into the ABS valves regular bleeding will never remove that air as stated only an ABS tool can remove the air.
Very common complaint on this forum.

 

Still wondered if there was a way to test this .?
I'm gonna do a mc bleed on truck .The basic pressure test with pedal shows good on the master but I'll try a pressure test on it directly..I cant get my hands on the scanner for now.

 

A follow up.
It was BOTH . But significant difference after new master cylinder! Great pressure since bleeding an changing fluid, no air.

And NO .I never had to take it to a dealer for a abs modulator bleed down.
From what I've read an by my experience on mine the 2WD -not 4WD -doesnt have to be DRB dealer bled .
4wd may require it .
Thanks

 

I told you in post #9 your master was bad.