The power brakes operate off of vacuum. Since diesels do not operate with any notable vacuum, a separate pump is typically installed from the factory to power the brakes, as well as the HVAC controls, etc.
I typically had no power brakes at idle, so I decided to disassemble the pump to fix this issue.
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| Location |
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| The spring is compressed, so be careful when pulling the nut off. |
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| The piston appears to use a brass ring that is pressed against the cylinder by a 1/4 OD o-ring. I honed the cylinder walls, hoping that oil would stick to it better. |
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| Below this steel cover is an o-ring and a brass fiber bushing for the rod. |
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| Brass fiber bushing. |
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| Reassembled using hydraulic press, would be very difficult otherwise. |
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| Fully assembled, ready to install. |
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| After installation. |
Now, the pump pulls a strong enough vacuum at idle to enable power brakes. Exciting! It just needed a good cleaning and honing.
If you need a new one try Pierburg because that's the manufacturer of the vacuum pump. I had a new one installed in the Netherlands
ReplyDeleteThanks Dan,
ReplyDeleteI just assumed that Bosch manufactured the pump. That's great to know, I didn't even know Pierburg existed. Do you currently live in the Netherlands?
Nick
Hello, Can you direct me to a source for the seal to this pump?
ReplyDeleteThank you,
Bob
Bob,
DeleteAre you referring to the O-Ring used to seal the housing halves?
Nick