treadle vac

Posted by 55clipper On 2016/8/13 10:23:33

My 55 Caribbean has a noisy treadle vac. When I step on the brake pedal with vacuum in the system it makes a noise that I will describe as a burp. Every time you push the petal, it burps. The car stops normally. If I turn off the engine and pump the petal, it makes the noise until the vacuum is depleted then disappears. I'm thinking maybe something in the vacuum portion of the brake. Ant ideas?