Ok and just to further clarify the issue because i dont think you truly understand your own statement here.
In the three cases you mentioned, gideon v wainwright, miranda v arizona, and brown v board of education, the ruling had no expansion to any amendments. That is, they did not create new precedence on what a law fundamentally means. Its one thing to set the precedence as to how a law is interpreted. It is another to create a new fundamental meaning of a law; in other words, liberal justices often create new powers or new additions to existing laws. In your cases, all they did was uphold existing parts of the constitution in direct contradiction towards newly passed, state level, liberal rulings.
Compare and contrast:
In gideon v wainwright, gideon was denied counsel, correct? The ruling made by a liberal judge was that counsel should only be given to those who commited capital offenses. This ruling is in direct contradiction with the sixth amendment which states,
" In all criminal prosecutions, the accused shall enjoy the right
to a speedy and public trial, by an impartial jury of the State and
district wherein the crime shall have been committed, which district
shall have been previously ascertained by law, and to be informed of the
nature and cause of the accusation; to be confronted with the witnesses
against him; to have compulsory process for obtaining witnesses in his
favor, and to have the Assistance of Counsel for his defence."
You see, not to name call or take partisan sides, but by definition that is a liberal ruling. It implies certain meanings of the constitution and applies them in court rulings. The implication here was that provided counsel is only necessary for those accused of a capital offense.
The conservative supreme court overturned the state of florida (i believe?)'s liberal ruling of this case and upheld the plain and simple words of the constitution (bill of rights).
dont make me list out all of the cases. they all follow the same model.
In miranda v arizona, liberal arizona decides miranda doesnt deserve 5th and 6th amendment rights, conservative supreme court upholds.
Brown vs board of education, liberal Kansas decides Oliver brown et al falls under the precedence of Plessy v ferguson in which a liberal panel decided that from now on the 14th amendment means bull. Conservative Earl Warren led the charge with the NAACP to decide plessy v ferguson was an abomination to the constitution and to return to the classic, conservative interpretation.