Yes, my 76 4/4 is RHD and the pipes exit towards the o/s wing valance with short lengths linking to what I assume are the the brake light switch mounted on the bulkhead from the primary (front) circuit - closest to the brake pedal - and the secondary circuit links to the rear of a manifold assembly mounted on the o/s wing valance adjacent to the master cylinder. There is a link from the brake light switch to the front of the manifold assembly and I guess the dual brake switch mounted in the centre of the manifold monitors the differential pressure between the two circuits. So if I re-connect the battery I will be able see if the brake lamp on the dash illuminates to show the master cylinder fault ( with the handbrake off)
Thanks for your suggestion re. GEE - will call them in the morning.
