what proportion valve are you using besides a granada one?

I can't find a granada here anywhere. We have some T-birds and ltd 2's in our salvage yard and other small fords. Thanks.

 

I am useing the stock drum/drum prop valve in my Sprint with disc swap up front...No problems,workes very well.

 

same with me. works very nicely.

 

Thanks, I'll try and bleed the system out. I have discs up front and drum in rear, but the rear still seem to lock up first with the original prop valve.

 

I am running a Wilwood adjustable prop valve along with the stock all drum "Combination Valve" (it is not just a prop valve like some cars). It works well. I was finding the rear locking up too fast for my taste.

BTW, where in Fl are you? I am near Clearwater.

 

Thanks, adjustable prop valve may be the way to go. I live in SaintCloud, florida

 

Ditto. No issues for me with the drum/drum valve.

 

X four! No problems whatsoever...

 

I am using the stock one from a disk/drum setup, but with a Wilwood m/c swap. no problems. I can stomp the brakes and it stops on a dime, and no skidding, front or back.

 

scooper, how much did that setup cost ya?

 

2 mav man,

Did you change out the master cylinder to disc/drum?

 

Justin, I threw down 250 for the m/c, and around 50 for the line lock, the lines I bent up myself, and the rest is stock.

I got tired of replacing my master cylinder with O'Reilly rebuilds and having them perform like crap.

 

Same here.

 

CaptainComet, I have not changed the master out from the drum drum yet. I was going to buy I a new one for a disc drum without power brakes for a 75 or 76 and see how that worked, and hope that stops the rears from locking first. Thanks.

 

If you are running the original MC, you will have weak pressure on the fronts. Disc calipers need a higher line pressure than drum. A proper disc/drum MC will have a smaller bore for the disc section, creating that additional pressure.

Definitely, change the MC first. I am sure that will make the biggest difference right now.

I have a non-power later Mav disc/drum MC myself. Available rebuilt from most parts stores. Paid less than $30 for mine, a long time ago. You will need to shorten the rod from the pedal to the MC, or it will sit high. I still need to do that ... drove it for a long time like it is.

That Wilwood unit that Scooper posted is pretty, too ... I will bet that it works great.