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check to see if it holds vacuum.
1) Shut vehicle engine off
2) Step on brake pedal (should go down easily)
3) Step on brake pedal a 2nd time and it should be difficult to push, if working properly (holding vacuum).
If pedal is difficult to push down the 1st time, booster is not holding vacuum. Could be the "one-way" valve on the booster is defective, or could be that the booster itself has developed a leak due to rust or corrosion.
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∙ 13y ago
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