brake cylinder vs hydraulic brake cylinder

brake cylinder and hydraulic brake cylinder both are nouns.

Word	Noun	Adjective	Verb	Adverb
brake cylinder	Yes	No	No	No
hydraulic brake cylinder	Yes	No	No	No

As nouns, brake cylinder and hydraulic brake cylinder are synonyms defined as:

brake cylinder and hydraulic brake cylinder: a cylinder that contains brake fluid that is compressed by a piston

Other synonyms of brake cylinder include master cylinder.

brake cylinder (noun)	hydraulic brake cylinder (noun)
a cylinder that contains brake fluid that is compressed by a piston	a cylinder that contains brake fluid that is compressed by a piston