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Why is my manual vacuum pump adding more air into my brake lines instead of sucking anything out? I see bubbles appearing in the reservoir when 'bleeding' my brakes. What am I
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![Locomotive appliances . Fig. 4.Regrinding Locomotive Gauge Cock THE MASON AIR BRAKE PUMP REGULATOROR GOVERNOR. This regulator is designed to automatically controlthe air pressure in the brake system for operatingthe brakes on Locomotive appliances . Fig. 4.Regrinding Locomotive Gauge Cock THE MASON AIR BRAKE PUMP REGULATOROR GOVERNOR. This regulator is designed to automatically controlthe air pressure in the brake system for operatingthe brakes on](https://l450v.alamy.com/450v/2awh4pm/locomotive-appliances-fig-4regrinding-locomotive-gauge-cock-the-mason-air-brake-pump-regulatoror-governor-this-regulator-is-designed-to-automatically-controlthe-air-pressure-in-the-brake-system-for-operatingthe-brakes-on-railroad-cars-it-is-placed-in-thesteam-supply-pipe-leading-to-the-air-pump-andregulates-the-amount-ofsteam-passing-to-pumpand-allowing-the-pump-torun-just-sufficiently-tomaintain-the-desired-airpressure-in-the-train-ser-vice-pipe-description-the-prin-ciple-on-which-the-masonair-brake-regulatorworks-is-that-of-anauxiliary-valve-8-con-trolled-by-the-air-pressurefro-2awh4pm.jpg)