I must say, that over the last few weeks I have been indulging in tracking down the squishy pedal, that I think I've always had since I got the XJ.
replaced shoes, pads, rotors, ended up changing master cylinder all with nil improvement.
I bled the system, 5x, one man method, two man methos, heck I used 3x 750 ml in total during this, good enough to flush the whole system several times. If there is still air in there, I dont know how to get that out anymore, since I practically flushed everything that was in there, out, fluid +/- air.
Now about to replace my OEM front brake hoses...not fit with steel lines (those WILL give you most likely hard(er) pedal, but with rubber once first. Haven't got any leaks, and the breaks work ok, just that squishy sounds. Brakebooster working, no rod adjustment....

What I'm trying to say is: soft/squishy is likely air in the system, even in my case where I properly bled the system....more than 5x. So I'm open to suggestions on how to get that out (and maybe the OP too)...and despite I think my booster might actually cause that squishy sound, I've no indications my booster isn't working properly , going by the tests from the FSM...

 

Even thought it squishy brakes are working ? I mean you can panic stop if need be or is it seat of your pants hope I don't hit this car panic stopping?

 

By squishy like air escaping squishy sound?

 

Yeah, like your pushing on a wet sponge...and yes, still working ok

 

Noise or pedal feel ?

 

Roler, you probably have a bad diaphragm in your power brake booster. Time to replace the booster.

 

Theres a insulat noise suppressor kit for this also bad booster will stiffen pedal...

 

No noise and pedal appears ok...pedal becomes good solid with engine off, so the.booster should be.good...and pedal is not hard when driving, which also makes me believe the booster should be ok.

 

OK, I thought noise on application was mentioned.

With engine off, and if you push down hard on the brake pedal and hold it for about a minute...does it sink further toward the floor?

 

Nope.

 

I guess at this point I would take it to a professional brake shop and have them pressure bleed it.

 

Well, if the squishy sound isnt a bad thing, I dont really care...I reckon I've had it for quite a while, maybe even years, but never really paid attention to it. Just wanting to know if this is something I should keep chasing...

 

Is the rubber tube still on booster by brake pedal from what ive found the wooshing is vacuum rushing in and out of booster the rubber tubes a silencer ? Sounds strange but who knows ?

 

http://www.factorychryslerparts.com/...5197244AD.html

 

I'll have a look....when I pocked my head underneath the dash to investigate that area, I could not see any disconnected parts or lines. But will check again...