My brake pedal floor on my 64 ford galaxie.Just rebuilt brakes new lines, wheel cylinders, pads,and springs.

Question

i Bleed brakes everything seems right, there seems to be no leaks yet there is no pressure in the brakes. is there any test as far as checking the brake booster which was recently replaced.or any thing else that could solve my problem.

Answer 1

I have a 1964 Galaxie with a 390 Cruisomatic trans, power brakes, power steering. My car is stock under the hood with single line master cylinder. Things you need to ask yourself:

When you bleed the brakes does the brake fluid disappear, if you have the stock brake system you should be bleeding the brakes from the rear to the front. Start at the passenger rear to the driver rear, then the passenger front and the driver front. Make sure you fill the master cylinder as you go. If you pump the brakes and the fluid level stays up then you have no leaks. So then we can move to the master cylinder as you push the peddle down do you see the fluid move.

Now the booster is run on vacuum. Your vacuum lines need to be hooked up correctly and tight. There should be 2 lines one from the intake manifold to the booster, the other from the booster to the automatic trans. The lines are 2 different sizes did you hook them up correctly? You need to have the car running while you check this if the car is running the vacuum should build up. As you push the brake down do you hear a vacuum leak? This is with the stock intake manifold and stock booster. Did you install a new motor different intake, different year booster. The vacuum lines need to be correct. Did you convert from standard brakes to power brakes?

If you are absolutly certain there are no vacuum leaks and everything is hooked up right with the correct pushrod in the master cylinder. Then it sounds like the booster may be the problem, if there is constant air in the system your peddle will vibrate at your foot. If the booster has a torn diaphram then it will leak and go to the floor. Usually a bad master cylinder will be a hard paddle, a vacuum leak or fuid leak will be a peddle to the floor. If you hear air escaping it is more likely a bad booster. You need to determine were the air leak is.

Answer 2

Try bleeding it more. Check every thing again to be sure there are no leaks.

Answer 3

there is probably still air in the lines yet. if your sure you got it all out, then it is probably the master cylinder.

Answer 4

you can check your brake booster, w/ car not running, pump your brake pedal several times 3 or 4 times and on your last pump keep pressure on the pedal and hold it. then start your car with foot still holding pressure on pedal, you should feel a small drop in the pedal when car starts. if not you could have a leak on the vacuum line to booster or a bad booster. you could also have a bad master cylinder.

Answer 5

Have you rebuilt or replaced the master cylinder ?

Answer 6

You either did something wrong or the master cylinder has failed. Was it OK before you "fixed" it? You should get the brakes bled with a power bleeder anyway. That pump the pedal open the bleeder stuff is garbage.