tocloft and book/chapter problem

[Wolfgang Engelmann]

I am using bookstyle and try to get the chapter/section separated in the list 
of figures
There are no problems with
9.1  Figurechapter9legendfigure1
.
.
.
9.10 Figurechapter9legendfigure10
10.1 Figurechapter10legendfigure1

but with

10.10Figurechapter10legendfigure1
       ^^
there is no separation.
I tried the tocloft package in the preamble
.
\usepackage{tocloft}
%see EMail Husmann
\renewcommand{\l@section}{\@dottedtocline{1}{1.5em}{2.9em}}
\renewcommand{\l@subsection}{\@dottedtocline{2}{4.4em}{3.9em}}
\renewcommand{\l@subsubsection}{\@dottedtocline{3}{8.2em}{4.1em}}
%\renewcommand{\l@paragraph}{\@dottedtocline{4}{5.0em}{5em}}
%\renewcommand{\l@subparagraph}{\@dottedtocline{5}{12em}{6em}}
\renewcommand{\l@figure}{\@dottedtocline{1}{15em}{12.0em}}
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                                                                  ^^^^^  ^^^^
%\renewcommand{\l@table}{\@dottedtocline{2}{1.5em}{3.9em}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

using higher values                                       ^^^^    ^^^^
but with no effect on the separation.
Do I need some other package or some other commands to get the desired effect 
of 
10.10 Legend?  

Perhaps somebody has a hint.

Thanks

Wolfgang