You may still have some trapped air in the system.
Try this before you give up and buy an new master cylinder. Fill both reservoirs and bleed the master cylinder first. Bleed off nearly a full reservoir out of both reservoirs. Re-fill the reservoirs and then bleed the wheel cylinder furthest from the master, the right rear. Re-fill the reservoir and then bleed the left rear. Re-fill the reservoir and cap it off.
Now do the right front the same way, then the left front.
Be careful while you are bleeding that you never let the reservoir get too low as you will pick up air and have to start all over again. Always try to have at least a 1/4 inch of fluid for the bottom if possible, or never let the master reservoir go below half full. It is possible to pick up air even if there is a tiny bit of fluid in the reservoir while you are pumping the brakes.
I was taught you should do the wheel cylinder furthest from the master in that the fluid has the farthest to travel. Once you are sure all the air is out of that line, you move to the next furthest.
Try it one more time and see if that helps, if not, then the master cylinder may be to a point that replacement is the best alternative.
Always double check the bleeders before moving to the next wheel that they are completely tight, or else you will draw in air into the system. Then you are back to square one again.![]()
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