Leaking Master Cylinder on PSD
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Junior User
Joined: Dec 2005
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Leaking Master Cylinder on PSD
I have a minor leak on my 1999 F-250 4x4 6 SPD PSD master cylnder. I noticed it by the wetness on the frame rail in the driver side wheel well. I cleaned everything up and it is not leaking from the brake lines and it is not losing fluid out of the reservoir at a rapid rate. Braking action seems unaffected. It is still leaking fluid - somewhere.
Not having a lot of experience with diesels I have no idea what the little "blue can" is (pressure accumulator is my guess) on the master cylnder casting is but it may be the source of the leak.
thanks
Not having a lot of experience with diesels I have no idea what the little "blue can" is (pressure accumulator is my guess) on the master cylnder casting is but it may be the source of the leak.
thanks
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by Varkwso
I have a minor leak on my 1999 F-250 4x4 6 SPD PSD master cylnder. I noticed it by the wetness on the frame rail in the driver side wheel well. I cleaned everything up and it is not leaking from the brake lines and it is not losing fluid out of the reservoir at a rapid rate. Braking action seems unaffected. It is still leaking fluid - somewhere.
Not having a lot of experience with diesels I have no idea what the little "blue can" is (pressure accumulator is my guess) on the master cylnder casting is but it may be the source of the leak.
thanks
Not having a lot of experience with diesels I have no idea what the little "blue can" is (pressure accumulator is my guess) on the master cylnder casting is but it may be the source of the leak.
thanks
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Junior User
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Originally Posted by Kwikkordead
What's coming out? Brake fluid or ATF? That will tell you what's leaking. The little pressure accumulator that you speak of is the hydro-boost. They use hydraulic boost instead of vacuum to provide braking assist.
Must be brake fluid (looks like it)- how would ATF get there?
Hydro-boost it is dripping off it.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by Varkwso
Must be brake fluid (looks like it)- how would ATF get there?
Hydro-boost it is dripping off it.
Hydro-boost it is dripping off it.
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Junior User
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Originally Posted by Kwikkordead
The power steering uses ATF as the fluid. They hydroboost is driven by pressure provided by the power steering pump. That's why I was asking about what's leaking. Whatever fluid is coming out will tell you what's leaking and needs to be replaced.
Lead Driver
Joined: Dec 2003
Posts: 5,250
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FYI, if you need the replacement, stay away from autozone and oreillys. If you dont want to spend the bucks to get it from the dealer, get it from NAPA. Just telling you from past experience
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Junior User
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Originally Posted by empiretc
FYI, if you need the replacement, stay away from autozone and oreillys. If you dont want to spend the bucks to get it from the dealer, get it from NAPA. Just telling you from past experience
I will be checking all the connections from the power steering pump now.
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Junior User
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Power steering was down about an ounce. Cannot see any leakage around the hydro-boost, brake lines, power steering pressure line or return line. I can detect minor seepage around the master cylinder near the firewall and that is about it...
Minor leaks, vibrations and electrical can drive you nuts....
Minor leaks, vibrations and electrical can drive you nuts....