Take it to Renault who will insist on putting it on clip....£80. No faults will be found, if you are lucky, new brake cylinder fitted....£250, if you are unlucky new brake unit fitted....£650, then brake cylinder fitted. OK, relax, just my sick humour.
You need to get slack on the cable and get the lever back against its stop.The problem at the moment is the lever is not moving far enough to trip the self adjust mechanism. If you want to risk a visit to renault for a reset pull the emergency release to get slack. If not, possible if someone operates the brake a second person can push the lever back while it is being released. Failing that the brake needs to be released, the lever pushed back as far as it will go, self grips or similar applied to the cable to prevent the lever moving and the brake applied and released, slack pulled on the cable and the process repeated if necessary, to get the lever back on its stop. Now with brake released undo the cable from the lever DO NOT START THE ENGINE WHILE IT IS UNCOUPLED
. Next try to move the lever shaft slightly out on the caliper unit (about 3 mm if lucky) and thoroughly clean the small exposed part of the shaft apply a little
to the shaft. The seal on the shaft is to exclude dirt and has nothing to do with brake fluid so no problem with the
. Operate the lever a few times till it is free, reconnect the brake cable and operate by hand to take up slack on cable.Remember anything unsecure used to jamb the lever may fly when operating the brake. Hope that makes some sense
To keep the PC brigade happy chock the wheels with the brake released and leave it in gear!