Quote:
Originally Posted by GreenSnakeDoc
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So, does anyone think my Master Cylinder is too small? It's a new one, has a 1.0" piston and it's for a 78 Mustang II. The rear calipers have the stock 2.125" pistons, while the front calipers went from 2.625" pistons to 2.938" pistons. Does any brake expert think this increase in caliper piston diameter exceeded the capacity of thge Master Cylinder?
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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.