I have never replaced an amplifier. I suspect that you have not reproduced the proper oriface size at the source line that broke; remember I told you not to glue it back together. The original hole is either .5 or .6mm. That is a little over 0.020in. If you make the hole bigger the metering system can't control the vacuum.

Have you measured your boost signal? If it isn't getting to the amplifier the vacuum will not be dropped as it grows. If you don't have a boost signal at the amp then you also probably don't have one to the aneroid. Check it out.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician