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9 times out of 10, it is just going to be a caliper that is frozen causing this problem. Its going to be the piston or the slides are hanging up. I have a feeling this might just be a coincidence that it is happening now after the master cylinder is replaced.
Try opening up the bleeder and see if that releases the caliper. If so, then you have a faulty master cylinder or something in the hydraulic brake line causing this problem.
Sorry for the delay!
THis sounds like a bad master cylinder to me!
Think about. It only started after the master cylinder was replaced.
I think you have a defective master cylinder. Take it back under warranty.
After that, if we still need to dig into this further, let me know... I will be here. But I don't think that we will need to go any further.
I hope this helps! You can always accept my answer now, and repost back again later on if you have any more questions. If you want to discuss it some more just hit "reply", it's free to do so otherwise don't forget to hit "accept" and leave positive feedback if you found my answer helpful.
I would think this would be a possibility.
TO see if you have abs, just look for an abs motor close to the master cylinder or follow the brake lines from the master cylinder. If you have abs, the brake lines from the master cylinder will go right into the abs unit.
Or, you can look underneath to see if there are any wheel speed sensors or abs rings on the axles or rotors.
Hey, do you think that this problem occurred because of improper priming of the master cylinder before I placed it on the car? I don't think I primed it at all. The guy I used to work for says I could have ruptured components inside the master cylinder when I installed it without priming it first.
Well, I suppose that is might be possible but I have never seen it. If the brake system is not bleed properly, you would just have a spongy brake pedal.... the master cylinder should not continue to hold pressure on the brake line.