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Final wrapup - testing used brake boosters 200 1986

posted by  darmstrong on  Sat Jan 29 05:51 CST 2005
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last visit: Sat Sep 13 12:21 CST 2014
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From my cold morning tests, where I put a vacuum gauge between the check valve and the booster, the differences between my known bad and 2 hopefully better units was subtle. After the engine was shut off, one however did seem to allow more "pedal pushes" before its vacuum was depleted, so I installed this unit.

It indeed seemed to work fine in the -20C temperature the next morning. I also noticed that it had held vacuum since the previous night when I parked it. If I ever have to test another one, I think I'll forget the vacuum gauge, and simply hook it up in place of the car's existing unit, to see if the seal holds overnight on a cold morning. This is probably the definitive yet simple test.

Then again, had I depleted the vacuum after parking it, who's to say the seal would pull back in on the cold morning! The ability to pass this test - with the seal sitting for hours relaxed in the extreme cold - would give me even more confidence in the unit.
--
David Armstrong - '86 240(350k km?), '93 940T(270k km), '89 240(parts source for others) near






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