Brakes/Master Cylinder -Lost All Pressure?

[Jon69RagTop]

Guys

I've put 1,700 miles on this set-up since installation and have had ZERO issues. Kore 3 C5, 325 up front and 335 in back. Wilwood 7/8 tandem master cylinder, but this issue has nothing to do with the matching of components. This is a manual brake set-up, and has worked awesome since day one.

Problem is this afternoon pullling into my driveway I lost all brake pressure, and I mean all of it. Pedal went all the way to the floor. Now my driveway is a slight uphill incline, so gravity worked in my favor and the slope of the hill stopped me in time from hitting the house. As I started rolling back down the driveway, I pumped the pedal maybe three times, and BAM I have full pressure again and the brakes work like never an issue. To say this has scared the B-Jesus out of me is an understatment.

I've checked for leakes and have found none. I checked fluid level and it is full. I've checked inside the firewall for leaking on the backside of the master cylined and find nothing. I've checked for secure linkage and the pedal and clevis, and all looks good. I'm at a loss, and a little nervous to take it out again.

Now the driveway does have a slight curb at entrance, and I drove over it this time a little quicker than normal. NOt sure if that could of caused an issue, but was wondering could that jarring motion knock an air bubble loose in the master and create 100% soft pedal. I had zero pressure, and then it came back instantly.

I would appreciate any expert opinions here, and definitly will be giving Tobin a call as well. I'm confident it has nothing to do with his product, and I'm suspicious this is a Master Cylinder issue. Just not sure what to be looking for.

Thans guys.