1967 Other Mercedes Benz Models brake does not hold

1967 MERCEDES BENZ
150,000 MILES • 6 CYL • 2WD • AUTOMATIC
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67MB230
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This is a model 230 just that with no letter.
When trying to stop brakes do not work well and car keeps vibrating with a hissing noise. If i am in park the hissing noise is also heard when i press the brake pedal. :(
I think the brake booster is shot.
Can these be rebuilt?
Mar 23, 2008 at 9:07 PM
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RASMATAZ
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Non repairable if its the booster-

To check the vacuum booster, pump the brake pedal with the engine off until you've bled off all the vacuum from the unit. Then hold the pedal down and start the engine. You should feel the pedal depress slightly as engine vacuum enters the booster and pulls on the diaphragm. No change? Then check the vacuum hose connection and engine vacuum. If okay, the problem is in the booster and the booster needs to be replaced
Mar 23, 2008 at 9:14 PM