1952-59 Ford poor brakes

I put power front disc brakes on my 54 Merc a couple years ago and have been dealing with spongy brakes since. I have a 10 psi residuel valve for the rear and have bleed the brake every way known to man kind. I have a firm pedal until I start the car then the pedal goes to floor. The brakes will lock up on gravel but you can't make a panic stop at hwy speeds. Any ideas. I am all out. I am using Granada spindel and brakes with a booster and master cylinder I bought on Ebay for 54 Fords and Mercs form Irish Dave. He sell a lot of these kits


Tom

 

Friend built a t bucket and he had same ,he had put the brackets on wrong and had the bleeder on the bottom of the caliper not at the top

 

Have you call Irish Dave and discussed your problem with him? HRP

 

Sounds like maybe you have a bad booster? You might try removing the booster and just run with non-power brakes and see if it still feels spongy. If it does, you're getting air in the system somewhere, like maybe a bad seal on the master cyl.

 

This link may help http://www.ehow.com/how_7478889_tell-brake-power-booster-bad.html run the tests and let us know your results,also your problem could be caused by a vacuum leak you might want to hook up a vacuum gauge and have a helper depress the pedal and watch for a gauge drop.There are some old discussions about single and dual diaphragm boosters posted here,most of the Irish Dave units have gone to dual as I recall the older single diaphragm units had some issues.Here is a discussion from the HAMB main board that may give you some ideas http://www.jalopyjournal.com/forum/showthread.php?t=605596&showall=1

 

What Carlos said. When I put the discs on the front of my 56 I accidentally switched sides on the calipers and the bleeder wasn't straight up top, it was off by about 15º. Couldn't get a decent pedal. Put them back on the right side and problem solved.