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Pressure failure switch

identify by 15 mm thread for warning switch

MG MGB LHD rubber bumper with dual line braking system, no servo from September 1974 (Roadster from GHN5-360301, GT from GHD5-361001)

Sprite / Midget Midget 1500 with dual line brakes from October 1975 (from GAN6-166304)