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Old 02-10-2006, 05:47 PM
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inconsistent braking

My brakes work best when the engine is cold. As it warms up the brakes get weaker. Is this due to the choke? Could I fix the problem by hooking up the brake booster vacuum line to the port directly on the manifold, or would it be better to decrease the idle speed (and richen idle mixture accordingly)?

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Old 02-10-2006, 06:56 PM
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what kind of car we talking about? where is your vacuum port hooked up to now? carb? normally GM puts the vacuum port in the intake either below the carb or in the runner close to the distributor.
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Old 02-11-2006, 07:44 AM
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1985 Monte Carlo 305 4bbl
The vacuum port is hooked up at the back of the throttle body, just under the carburetor.
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Old 02-11-2006, 08:39 AM
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Is that port direct manifold vacuum? If not plumb it directly into the manifold.
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Old 02-13-2006, 09:51 AM
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i wonder if you have a problem with the booster.... like a leak. the pedal feels hard? have you tested the booster? with the engine off, pump the brakes till it gets hard and hold it down. then start the car and see if the pedal returns to normal. try doing this with the engine on and off.. to see if maybe warmth is opening a hole somewhere...
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