My recommendations. Zdenek Mlynar, a college roomate of Gorbachev's, in his acct. of the Prague Spring, "Nightfrost in Prague (Mlynar was on the CC of the Czech CP) has some interesting dialogue w/ Brezhnev and Dubcek.
Autopsy of an Empire: The Seven Leaders Who Built the Soviet Regime by Dmitri Volkogonov (Author) Chapter on Brezhnev.
Khrushchev & Brezhnev As Leaders: Building Authority in Soviet Politics by George W Breslauer
Daughter of Brezhnev wrote a book on him too.
Shadows & Whispers: Power Politics Inside the Kremlin from Brezhnev to Gorbachev by Dusko Doder
Mass Uprisings in the USSR Under Khrushchev and Brezhnev: Protest and Rebellion in the Post-Stalin Years (New Russian History) Vladimir A. Kozlov / M. E. Sharpe