  We have obtained deep CCD R and I mosaic imaging of 578 arcmin$^{2}$ within
1$^{\circ}$.5 of the Pleiades' center -- reaching a completeness magnitude
I=19.5 -- with the aim of finding free-floating brown dwarfs. Teide~1, the best
$bona$ $fide$ brown dwarf discovered so far in the cluster (Rebolo, Zapatero
Osorio \& Mart\'\i n 1995), arose as a result of a combined photometric and
astrometric study of $\sim$1/4 of our covered area. The extension of our
two-colour survey provides eight new additional brown dwarf candidates whose
photometry is rather similar to that of Teide~1. Several of them are even
fainter. Follow up low-resolution spectroscopy (Mart\'\i n, Rebolo \& Zapatero
Osorio 1996) shows that one of them is indeed a Pleiades brown dwarf. Most of
the remaining candidates are background late-M dwarfs which are contaminating
our survey, possibly due to a small (previously unknown) cloud towards the
cluster which affects some of our CCD fields. We did not expect any foreground
M8--M9 field dwarf in our surveyed volume and surprisingly we have found one,
suggesting that its number could be larger than inferred from recent luminosity
function studies in the solar neighbourhood.
