In 1986, Sala became a magistrate of administrative disputes on the Supreme Court, and in 1988 was elected to the presidency of the Court of Auditors by its members. On 7 November 1990, Pascual Sala became the President of the Supreme Court and the General Council of the Judiciary, with a vote of 13 in favour to 4 against of an electorate of 20 of the members of the General Council. As president of the General Council of the Judiciary, Sala played a crucial role in the reaction to the scandal surrounding Luis Pascual Estevill, and requested Estevill resign after he was implicated in a number of offences. On 25 July 1996, Sala left the presidencies of the Supreme Court and the General Council of the Judiciary, and returned to his previous position as a Supreme Court judge. He was replaced in the presidency by Judge Javier Delgado Barrio.
From 2004 to 2013 Sala was a member of the Constitutional Court of Spain, and on 20 January 2011 he was elected its president. Sala was the first career judge ever to have been president of the Constitutional Court, with all the others having been professors. He remained in this post until 19 June 2013, when he was replaced by Francisco Pérez de los Cobos. Notable and controversial cases his presidency of the court covered include the legalising of the Basque political partySortu, which passed by one vote, and in whose case El País attributed the speed of the decision to Sala's effort; the case considering the constitutionality of same-sex marriage in Spain; and the beginning of the case regarding the declaration of sovereignty made by the Parliament of Catalonia. In a 2013 interview with Escritura Pública, a Spanish magazine related to law and the legal profession, Sala spoke of his concern about the politicisation of the court, saying that "the necessary institutional respect has sometimes become unknown to politicians who criticise decisions they do not approve of that the Court takes, confounding legitimate criticism with discreting, and even sometimes with insult".
Politics
In an interview with RAC 1 in late 2018, speaking about the Catalan declaration of independence, Sala said "for me, it's very difficult - almost impossible - that there might exist a crime of rebellion, and very problematic, not to say also impossible, that there might exist one of sedition".
Jurisdicción y competencia en el proceso contencioso-administrativo: problemas de delimitación competencial en la nueva Ley Reguladora de la Jurisdicción Contencioso-administrativa