If I upgrade my brake booster to a 83' and newer model do I install my original master cylinder ( 81' ) or do I have to go with the 83' to 91' master? Thanks, OLY
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Personally, I don't use used brake parts. Not worth the risk. But if you are on a tight budget, you test the brake booster with a vacuum pump. Preferably one with a gauge. Make sure it doesn't leak down. Then press in on the rod and make sure that it doesn't leak. The vacuum level will change when you press it, but it should not go to zero.
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