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1965 Hissing Noise Under The Dash

Bill –
I’ve got a 65 Lincoln that produces a hissing sound under the driver’s side of the dash when I start the car.
I assume it is connected to the brakes, as when I apply them, the sound stops, but the brakes are activated far too strong. Anything more than a feathers touch on the brake pedal nearly locks up the tires. Any suggestions?
– Ryan
Greetings Ryan,
I hate it when that happens.
From your description it sounds like you have a classic Brake Booster failure. Something inside is ruptured or has fallen out of position. It must be removed and sent out for rebuilding or swapped for a rebuilt exchange unit. If we can be of further assistance to you please don’t hesitate to call us.

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