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  #1  
Old 11-24-2007, 02:49 AM
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Join Date: Nov 2007
Location: Sac, CA
Posts: 17
1979 300d clunk when braking

My 300d clunks from the passenger side when I apply the brakes. Not all the time but often. I pulled the wheel off and nothing seems loose, caliper bolts are tight. Any Ideas. BTW I tried the corn oil thing from dieselgiant.com, it works, COOL!. This is my 1st diesel and I am defenatley going wvo if I can find a source!
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  #2  
Old 11-24-2007, 04:06 AM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 32,340
I had this on my two forty three hundred.

It turned out to be a broken allen bolt on the motor mount which allowed the mount to rotate under braking. When you looked around you saw nothing wrong.

I chased it for about two years before figuring out what it was.

Tom W
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins& six speed; I have had about 35 benzes. I am finishing a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual....I also have a 427 Cobra replica with an aluminum chassis.
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  #3  
Old 11-24-2007, 06:50 AM
Registered Diesel Burner
 
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
This is often caused by the front suspension control rod mounts. There is a heavy control rod that runs from the area of the lower ball joint to what I will call the frame/firewall area in the fender well. The mount bolted on to the firewall looks like a small ball joint. That ball joint goes bad easily because when the rubber boot stops sealing it from decay, all kinds of dirt and salt get in there. When you step on the brakes what you get is a clunk caused by this loose ball joint.

Lot's of information is available here by search on the control rod mount replacement. It is a common 20-year repair on these cars.

Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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  #4  
Old 11-25-2007, 08:26 PM
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Join Date: Mar 2007
Location: Tampa, FL
Posts: 271
i used to have a clunk sometimes with braking... after replacing my tie rods I haven't heard that particular clunk again... but there are so many more....
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1985 MB 300D/T

Fell off the WVO bandwagon when people started trying to charge $2.50 a gallon for dirty vegetable oil.
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