Hello all. Looking for some ideas here. 

After a unfortunate winter incident, my z has sat for almost a year. Started and ran a number of times to keep the engine and such happy, but as I get into it today, my once very firm brakes are totally gone. Push the pedal and there is almost no braking. Before it sat it was a amazing feeling pedal and worked flawlessly.

Any ideas as to what happened and where I should start? 

Cheers and many thanks. 

Caltanian. 

Check fluid levels and look for leaks when you go to pump them.

With it running does the idle go up when you push the brakes? That's a sign of a bad booster.

Brake systems don't like to sit. If it were mine I would start on one end and replace all the seals on the way to the other. Booster is a definite possibility

No change in idle when I press the brakes. 

Fluid levels are full and have not dropped when I press the brakes. 

The entire system had been overhauled within 3 years prior. 

Did you try bleeding them? always a good start.

Is the brake pedal soft then? Not completely clear if pedal is soft and no braking or hard and no braking.

Pedal is gone as in goes right to the floor, no assist, no real brake function.  Doesn't even really feel like the master is connected anymore. 

I plan to bleed them out tomorrow, but am definitely worried as to why they are gone as they are. 

Edited September 1, 20195 yr by caltanian

I'm going to guess it's the brake master cylinder. Pull the rubber boot off the end of the master cylinder to see if there's brake fluid in the boot.

Yes, you should have a puddle of fluid somewhere. Find that. Look around the inside of the tires/wheels too. When my rear wheel cylinder went out there was fluid all over the backside of that tire.

1 minute ago, siteunseen said:

Yes, you should have a puddle of fluid somewhere. Find that. Look around the inside of the tires/wheels too. When my rear wheel cylinder went out there was fluid all over the backside of that tire.

The puddle of fluid could be inside the brake booster or soaking the firewall insulation.

The only other thing going on is when the pedal is fully pushed the brake light comes on on the dash.