Here are examples of the word/phrase "braver" used in a sentence and paraphrased in a sentence...
He is a lot weaker than his partner so why is he braver?
He is a lot weaker than his partner so why is he more valiant?
You sure are brave, but I am braver.
You sure are brave, but I am more fearless.
He jumped into the water with sharks? Could he be any braver?
He jumped into the water with sharks? Could he be any more courageous?
Other Examples...