for supplying control impulses through a secondary air pipe

Full Title

Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00 (valve structures responsive to a speed condition B60T8/34; valves in general F16K) > Application and release valves > Other control devices or valves characterised by definite functions > for supplying control impulses through a secondary air pipe