Hi, just found this forum and I'm hoping to get some help with my brake problem.
I have a 1996 Grand Caravan LE and just recently I have experienced a loss of pedal pressure in the brakes. I put my foot on the pedal and it meets resistance and activates the brakes but sinks to the floor rather quickly. It feels like I have a blown brake line and I am pushing the fluid out of the line but I have had no drop in the reservoir at all, so I'm not losing any fluid, only pedal pressure. Today I replaced the master cylinder thinking that was the problem but it's behaving exactly the same after replacement.
What can be the problem here? I'm totally stumped.

 

sometimes a bad caliper or wheel cylinder can do that. Best to pinch off brake hose one at a time, see which one revive your solid pedal.

Also, did you do the master cylinder or a mechanic did? did you bench bleed the master cylinder properly and as well as the whole brake system?

 

Thanks for the reply! I did the replacement myself and bench bled the new master cylinder following the instructions closely. I didn't do any other bleeding on the system though. I think that's where I will start tomorrow. I have my doubts though because it feels exactly the same as it did before I replaced the MC.
If it was a bad caliper or wheel cylinder wouldn't I be losing fluid?

 

Yes the fluid would leak out and you should see it on the wheel; yet you said there was no level change in the master cylinder.
To see if there is air in the system, pump the brake pedal and see if the pedal feels firmer. If so, bleed ALL the lines. If not, the master is bad.

 

When you do a master cylinder, you need to bleed EVERY wheel in clock wise order 3 or 4 times to get the air out.

 

OK, thanks. I'm going to start with bleeding the system today and I'll report back with my results.

 

I bled the entire system today and found air at the drivers side rear wheel for some reason. Now the pedal is fine and I'm up and running again. I guess the problem was the master cylinder after all.