G'day from Oz, it's been a while, but need your help again. Done searching and all, but other than " it's needs more bleeding" didnt come up.

Trying to get my finger around squishy brakes (but relatively ok braking power) I had for a long time, replaced pads and bled after that (no change) and today replaced my master cylinder.
Cardone MC, bench bled it, kept it topped up during installation and bleeding. Brake pedal didnt feel too bad when had key off at first, but when started, brake virtually gone, almost no resistance. Cant 'pump' it up either.
Re-bled thoroughly (one-man-technique this time)...still almost no resistance and no brakes.
Gone through 1.5 ltr brakefluid, not a bubble in the lines, not the tiniest.

No leakage to be seen
MC was pre-assembled unit
Rear drums have been adjusted, right wheelcylinder replaced 20K ago

With old MC in place no real issues other than the squishy brake, no leaks
When bench bleeding MC, it did not appear to be faulty, good stroke power
Not adjusted the 'rod' because unit appeared to be exact same size as old MC

However: Now no brakes, no ride, no idea.

Appreciate your input,
Cheers.

 

pull both master and booster. remove master to see if fluid is leaking into the booster.

you may need to adjust the pedal rod out so it comes into contact with the master. too much and your brakes will drag. too little and you will feel the pedal have too much dead spot.
it may take a few times pulling the master to adjust, but you will eventually get it right.

 

I sized up both the old and new MC (before installing it) and they were exactly the same, so I didnt adjust the rod. Will pull the MC when daylight comes (at night here in Oz atm) to check for leaks from the new MC. It didnt seem to be faulty when I bench bled it though.
If the rod would be to far out now, wouldnt I feel the dead spot and than resistance? Its kinda more very low resistance all the way through now..

 

any other ideas?

 

you didn't change or pull the calipers at all?

 

A1 cardone return it get another....

 

No, not this time. Pulled the right calliper several days ago, but that was with the old MC on there. No brake issues after that.

its not the A1 Cardone, but the Cardone. Read somewhere that the A1 Cardone not the best choice is.
The cardone isnt exactly an EL Cheapo, compared to Centrix, Wagner and A1 Cardone. Same price as a Bendix, but couldnt get that one via Amazon.

 

You can measure quite easily to see if the rod from the booster is long enough or needs adjusting.

 

How?

(before putting the new MC in, I compared lenght of the part that 'surrounds' the rod from the booster. And the depth it had to go in was also comparable)

 

Compared by eyeball or measured?

 

held it next to each other (so it might have been a millimeter difference if anything)
the depth inside the piston rod I did not measure. I would think that a mm difference would not likely cause such a dramatic loss of resistance ALL the way through? On application of the brake yes, but not all the way through..(not that I question the fact the measuring will give the answer

 

Been there and done that. Don't assume anything with parts these days.

 

Guess you're likely right about that....well, first I will try if bleeding the prop valve will improve things before looking into adjusting the rod. Does the FSM have something on this (not near mine at the moment)?

 

I've never seen it covered. Been doing it for years. Saw it in an old repair manual recently. Worth checking.........You'll figure out how to measure it. Toothpick? Piece of wire? It will be blatantly obvious when you look at it.

 

Think the measuring will be do-able....is adjusting the rod in the booster too? It will probably be a trial and error...