More usually without. The JEs are like that although 中辞典 has both. Wikipedia uses in the body of text.

@@ -16 +16 @@
-<gloss>Braille</gloss>
+<gloss>braille</gloss>

http://www.brailleauthority.org/capitalization/capitalization.htm
"BANA recommends that the word "braille," when referring to the code developed by Louis Braille, be written with an initial lowercase letter. When referring to the proper name of Louis Braille, the inventor of the reading system, the initial letter should be capitalized."

enwiktionary: "Usage notes
The Braille Authority of North America recommends using lower-case braille for the script, and reserve capital Braille for the man. However, the script is commonly capitalized as well. In British English, the capitalised form Braille should always be used."

should it be capitalized or not? (I just approved 漢点字 "kanji braille" without capitalization)