hydraulic brake cylinder vs brake cylinder

hydraulic brake cylinder and brake cylinder both are nouns.

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

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

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

Other synonyms of hydraulic brake cylinder include master cylinder.

hydraulic brake cylinder (noun)	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