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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 54038
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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300SDL: MB 300SDL 86 A/T Vacuum Amplifier / blue unit on fender.

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MB 300SDL 86 A/T Vacuum Amplifier / blue unit on fender. Question: Is there a test to see if the unit is in perfect condition? Why? One of the vacuum hose nipple broke off, planning to drill out and install threaded stud w. same size hole. After installing, plastic cement the stud at the bottom for added strength.
Hi, unfortunately Mercedes does not provide a test procedure for the amplifier. I did find some procedures for testing the amplifier but it is done with the amplifier installed on the car. You may need to do the repair and then perform the test. I've attached the test steps and the vacuum diagram below.


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