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Quote:

If i crack the bleeders on the front i can then push the car then re bleed them and it works fine for a short time until it does it again. What would you suggest i do?



That tells you the master cylinder or prop valve is not releasing brake line pressure. It's usually caused by incorrect pedal to MC push rod adjustment or MC to booster push rod adjustment.

Make sure you have a little play in the brake pedal before it pushes the piston in the master cylinder. Same for the MC to booster if you have one.

If you have not done anything to the MC or booster that could have changed the gaps, it's probably a bad prop valve ,MC or clogged brake lines. How old are the flex lines to the calipers?

If you're looking past the prop valve take this posted advice and confirm the pushrod legnth as the second thing to do...If the pressure released at the pin then the hoses are'nt the problem...Would I run the old hoses ??? Absolutely not but the pressure would be from the hoses out {at the caliper} not all the way back to the prop valve... My guess is the prop valve as other have suggested...