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Old 05-06-2003, 10:21   #1 (permalink)
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Sierra Brake Servo Unit

I have a 1990 Sierra 1.8 CVH. The engine idles uneven and there is a hiss from the underside of the master cylinder where it joins the servo unit. If I disconnect the pipe from the servo unit to the inlet manifold and block the pipe the engine idles perfectly. Does this mean a servo replacement is required.
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Old 05-06-2003, 14:38   #2 (permalink)
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Hi penn .

I think you are right on it penn. I'm not sure of prices but a used one would probably be easy to find from a wrecking yard.
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Old 05-18-2003, 04:42   #3 (permalink)
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Hi Big Block Ford,

Just to let you know that I got a servo from a breakers yard and the difference it has made is unbelievable. I guess the old servo had been getting gradually worse and then you don't notice how bad it has got. The engine runs smoother than it has for a long time and tickover is like a sewing machine.
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Old 05-19-2003, 00:19   #4 (permalink)
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Thats great news penn.
As you say , sometimes things get worse slowly and go unnoticed.
Sierra's are cool and I have owned 2.
An 86 s/w and an 88 Cosworth.
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