im having some issues with braking and wanted to look into upgrading the front calipers to the 1LE or similar. i will be removing the factory proportioning valve as with the car on a lift and idling in drive, the rear calipers (new) dont bite until the pedal is pressed as hard as possible. i vacuum bled the brakes to no avail. pedal is firm to hard. all rubber lines are new as are the rear calipers. what calipers will bolt on to the stock spindle? how about 4th gen 2 piston calipers?

 

anyone? gorn, craby?