Steve,
1976 TL 845cc.
According to my local motor factor XBLS11 is a non hydraulic type, perhaps for the GTL?, but the spec of XBLS10 looked promising?. But if you say there's no such number?It would be very handy to know the correct number so he can order the right one?.
When the brake pedal is pressed really hard the brake lights do work, could be dirt in the switch, I'll remove it tonight and investigate.
Alan.
think you will find same switch is used on r8/10 and alpine a110