Quote:
Yes.
The required fluid volume offered by your MC, and required by your brake system, is inadequate.
The reason you have a tight brake pedal until you remove the line clamps is the fluid volume required is not being exceeded.
The master cylinder capacity is being maxed out out when you depress the pedal while your calipers and lines are requiring more fluid to develop the required pressure as designed.
A larger MC should solve your low brake pressure problem.
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Zacctly!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Had a similar problem when converting my 65 Mustang from drum brakes to 4 wheel disc brakes.........easy fix...........
Go to your local parts store and get a master cylinder for a 1980-1984 Ford F-250, make sure it is the cast iron type and not the newer plastic type.... This master cylinder has the big bore to push a larger volume of fluid as well as big resevoirs to hold enough fluid...
Have since used this master cylinder on 5 or 6 cars, works great.....
David