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Go Back   Dodge Cummins Diesel Forum > 2nd Gen. Dodge Cummins 98.5-02 24V Forums > 98.5-02 Powertrain
98.5-02 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect..NO ADVERTISING .

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Old 06-24-2011, 04:37 PM   #1 (permalink)
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Hydroboost leaking powersteering fluid

I am at a loss. I have never dealt with the master cylinder and never heard of a hydroboost until a few hours ago. I am new to diesel so if anyone could tell me why I am loosing powersteering fluid I would greatly appreciate it.

Also, could this be the cause of a slow return on my brake pedal?

Thanks in advance
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Old 06-24-2011, 05:08 PM   #2 (permalink)
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Is it leaking out of the gear box?
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Old 06-24-2011, 08:28 PM   #3 (permalink)
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Got a write up on how to rebuild the hydrobooost unit...
Dodge Cummins Brake Hydrobooster Rebuild
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Old 06-24-2011, 09:04 PM   #4 (permalink)
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I had to have my hydrobooster replaced under warranty on my 08 duramax when I had it and it did cause brake pedal issues. Mine would kick back at me before it would go down when I applied brakes. Should be related issue with yur brakes and leaking booster. Mine was leaking as well.
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Old 06-25-2011, 01:41 AM   #5 (permalink)
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Your power brakes are assisted by the hydroboost. That is why you have brake pedal issues. Run out of power steering fluid and you will lose both assisted steering and brakes. Either rebuild or replace the hydroboost unit or hoses that are leaking.
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Old 06-30-2011, 03:30 AM   #6 (permalink)
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There is a weep hole on the bottom of the hydroboost unit. When mine was leaking PS fluid it was coming out of there, although it seemed like it was coming from between the master cylinder and hydroboost. Solved problem with a replacement hydroboost unit
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Old 06-30-2011, 02:42 PM   #7 (permalink)
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Take it to a truck shop and be done. You can continue being innocent of master cylinders, boosters and other such foolish things.
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Old 06-30-2011, 02:51 PM   #8 (permalink)
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Quote:
Originally Posted by Mopar1973Man View Post
Got a write up on how to rebuild the hydrobooost unit...
Dodge Cummins Brake Hydrobooster Rebuild
Mike, Are the seals standard that could be bought from a seal supply house? If so, the next person that takes his apart could have them matched & provide description & generic part number.

I had the seal description for the PS/Vac pump rebuild. Will post when I find it.
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Old 07-26-2011, 12:23 PM   #9 (permalink)
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mine is leaking also... Thanks for the write up on the rebuild
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Old 07-26-2011, 01:35 PM   #10 (permalink)
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Thanks Mike! I'll be jumping on this rebuild this weekend!
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Old 07-26-2011, 02:04 PM   #11 (permalink)
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Quote:
Originally Posted by Junkman View Post
Mike, Are the seals standard that could be bought from a seal supply house? If so, the next person that takes his apart could have them matched & provide description & generic part number.

I had the seal description for the PS/Vac pump rebuild. Will post when I find it.
Don't know...
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Old 07-26-2011, 02:15 PM   #12 (permalink)
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Quote:
Originally Posted by Mopar1973Man View Post
Don't know...
Someone that takes the hydroboost apart can go to a bearing/seal supply & have them match the seals.

For the vac pump there is a

large O-ring # 039 My notse say it is orange, possibly Viton.

Small o-ring # 132 And a seal

Seal 28x38x7 (probably mm) notes say ANBR

I should have rewritten my notes with more documentation. The point is that the vac pump seals are standard sizes and only cost a few dollars when purchased individually & not as a "Cummins" set.

Perhaps the hydroboost is similar.
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