Can't get fluid from master cylinder

[fastdave]

I'm trying to bleed the power brakes on a 67 mustang. I can't get the fluid to come out of the Master cylinder. It is a new unit-booster & M/C. I disconnected the brake lines from the M/C and pumped the brakes but no fluid flow. No there is not a cap or plug in the holes. I had someone push on the brake pedal and it does travel what should be normal travel distance. I also disconnected the pedal to ensure the rod was travling the full stroke. When I look into the M/C and have someone push on the pedal I can see the piston move but it looks like it only moves 1/16 - 1/8 inch. I don't know what is normal. There is a plug on the bottom that the book says is a piston stop?? Any Ideas?

 

[nmk_61802]

Is the rod that goes into the M/C from the booster adjustable? If it is it should have a threaded end and a dome cap on it. Perhaps that is not adjusted properly and the first part of the pedal travel is taking up that slack.

 

[1Bad67]

Did you bench bleed the m/c. Most of the new & rebuilt ones come with the fittings & hose.

 

[krash kendall]

Disconnect the lines and plug them with two of your fingers, then have someone press the pedal. Works every time. Hook them back up as you get fluid from each. Or, you can just loosen the lines and try, you may get lucky.

 

[2nd Mustang]

Is the rod that goes into the M/C from the booster adjustable? If it is it should have a threaded end and a dome cap on it. Perhaps that is not adjusted properly and the first part of the pedal travel is taking up that slack.

This is most likely the problem. When I changed my MC and booster in my 67 coupe, I had to adjust the booster to MC rod three times. There is a specific measurement per the manual. Without the proper adjustment, not only will you not have brakes, but as I found out, you'll lock up the brakes and can't release them without a lot of headaches. Best advice I can give you, is read the book, it really helps.

 

[fastdave]

This is not my car,I am just working on it for a friend. He said that he bought the brake booster/master cylinder from Checkers auto over 2 years ago. It didnt have any fittings to bench bleed it. I will give the 2 finger trick a try. It doesnt appear to have an adjustable rod and he doesn't have a manual just an old cheap book that just touches on the brakes-nothing in detail.