I have a clunk in the car when the car downshifts. From researching this forum the conclusion seems to be a bad check valve (on vac line from pump to brake booster). Either this or I will have the mechanic look at the whole vac sysstem to find the leaks. How much does this service cost?Is it necessary to do this repair?I think I can live with the ,but if it ruins my tranny, this is a whole new thing all together. What's your twocent's??? Gracias. amigos!!!

Tell us what model your car is.

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)

I have the same problem on my 89 300E since I had it back in 95. I also have bad differential mount bushing and engine mount, could they be part of the reasons?

The car is an 84 300D Turbo with 256k. Thanks. Is there a DIY illustration on how to check the whole vac system on this car? Thanks.