Well just got done doing the trailgear f/r 3" setup and swapped everything over. Put everything back on and bleed the brakes.. Get the rears done things are getting good and hear a decently loud air pssshhhtttt blowout type thing and have no pedal what so ever now.. Replaced the MC 2 times from autozone parts and have nothing. We have bled the system but there is absolutely no pedal. Goes right to the floor and when i compress the pedal and crack the bleeder its always solid fluid no air coming out...

I read one thread some guy mentioned if you stab the pedal and can hear an air sucking type sound coming from down by the pedals/firewall area that the booster might be bad? any confirmation.. Hate buying parts to fix things that end up doing nothing...

Anyone else have any recomendations?

thanks
danny

 

Definitely check the vacuum line going to the brake booster (big one coming off top going to manifold). The Psssssh noise is likely vacuum bleeding off.

 

Even without a booster, you're still actuating the MC.
Some MC's need to be bled, is there a valve on the MC?
Another way to do it is to use a vac pump...Start with the rear right wheel, suck it through until it's clear.
Rear Left, front right, front left... You'll be filling the resv several times during this process. If you suck in air (leave it empty) you're starting over.

 

Bleed the MC.
Pass side rear.
D-side rear.
Pass side front.
D-side front.
LSPV.

 

I have a 1986 Toyota 4 x 4 pick up I wanna do brake booster swap it has the single diaphragm I believe a 96 T-100 dual diaphragm will fit I have heard this is this correct