I've got an 500E master cylinder sitting on my shelf. It was removed from my 190E fall of last year. I was trying to sort through some braking issues and I swapped it out for a 190E master/booster combination that really didnt help at all. So now I have an actual 500E booster I wan't to swap this back in...

Is there any way I can test/check it? Its just been sitting on my shelf for the past few months.

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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k

99% odds, if it was good = it still is.

You need to build a test stand with master, pedal, and supplied vacuum..
It is faster and easier to install it in the car (even for me).


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ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

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