Hello,
Suddenly when unloading my Rocket 88, 1950, the brake pedal went totally to the floor board. I bought a new master and bled the system by vaccum. But still there are no resistance in the pedal, nothing! Not spongy or swampy, JUST DEAD! When checking the mc on bench it gets stiff, but when mounted no resistance at all. No visible leaks at all, and if there were leaks at least some tension would be feelable in the pedal?
Donīt understand the TOTAL DEADNESS...

//Patrik

 

I don't know what you mean by "bled the system by vacuum " .
But here is a procedure that has always worked for me .
Get an assistant to help . They will pump the brake pedal while you open and close the bleeder screws on the wheel cylinders .
Make sure the master cylinder reservoir is full . Keep checking the reservoir during the procedure and make sure it is full .
Go to the wheel cylinder that is farthest from the master cylinder .
Have your assistant pump the brake pedal several times and then hold steady pressure on it .
Crack open the bleeder screw and you should get air or maybe some fluid . Repeat this until you get a steady stream of fluid with no air bubbles .
Repeat this at the wheel next closest to the master , until all cylinders are bled .
You may have to go around the car a couple of times to get all the air out and get a totally firm pedal .

 

If you have pressure at the master and none at the wheel cylinders check your flexible brake lines for deterioration. Also remove the brake line at the master and see if you have pressure there., gotta be something between the master and the cylinders. On a early fifties i don't think there was power brakes so no booster is involved..... Let us know what you find... Tedd

 

Sounds like you have a leak somewhere in the system.

 

I kinda thought about this sometime in the middle of the night for some reason. Are you sure the rod from the peddle to the master is the correct length and you are getting a full stroke on the master? If you take off the brake line will fluid come out when it's pumped. I think you have a master problem new or not..... Keep us informed we like a mystery....Tedd

 

Thanks for advices!
I have plugged the outgoing lines at mc and then I have resistance in the pedal. But when connecting the lines pedal is dead. I have checked wc and no leak, in fact the brakes must be newly renovated, they look great. Canīt find any leak. And even if a leak I think I should have some resistance in the pedal. It is not spongy or swampy it is totally DEAD! I have sucked out half a gallon of brake fluid through the system. But still not a single reaction... Will give it one more try now and see.