Quote:
Originally Posted by Hatterasguy
I think its just age, with the 617 pumps. Nothing lasts forever, and at 300k miles it might not be a bad idea to put a new one on.
The 603 pumps were just a bad design, the new ones don't seem to fail.
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Even though this may seem like a great design, it is a good design, which means that it's predicated (my opinion) on the assumption that the car will probably be retired after 300,000 miles/500,000 km.
If you look at over-the-road trucks, which are made to be rebuilt after a million miles or so, they have a bolt-on vacuum pump for that reason.
When I get a DeSoto Suburban and redo it with a Perkins diesel engine like its Euro version was, I will use the external vacuum pump on the brake booster, for that reason. Building a truly bulletproof car is not hard, if you want to expend the extra cash.
On the older MBs, it's easier than you think.