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Small leak where brake pedal goes through firewall

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Old Feb 19, 2026 | 09:52 AM
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Small leak where brake pedal goes through firewall

I've got a little leak developing where the brake pedal goes to the firewall. Does the brake booster have fluid in it or is this coming from the master cylinder?



 
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Old Feb 19, 2026 | 09:58 AM
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Hydro boost is leaking ATF ( supposed to be ATF Meron V )
 

Last edited by knottyrope; Feb 19, 2026 at 10:01 AM.
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Old Feb 19, 2026 | 10:05 AM
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Old Feb 19, 2026 | 10:27 AM
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Hydroboost needs replacing your power steering pump feeds the hydroboost.
 
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Old Feb 19, 2026 | 11:29 AM
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Anyone know the Ford part number for this angled o-ring on the metal pipe coming right off the hydro-boost? I just replaced my power steering high pressure lines, but they attach to the pipe this guy is holding. I don't want to reuse what's there now (407k mile truck)


 
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Old Feb 19, 2026 | 12:49 PM
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Originally Posted by queen of spades
Anyone know the Ford part number for this angled o-ring on the metal pipe coming right off the hydro-boost? I just replaced my power steering high pressure lines, but they attach to the pipe this guy is holding. I don't want to reuse what's there now (407k mile truck)

I have not had mine apart, but it’s likely a regular o ring that is just shaped like that from compression. If no one can give you the number you could put a micrometer on it and order it from McMaster.
 
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Old Feb 19, 2026 | 10:15 PM
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Just a standard Viton O ring, iirc they should come in the new or reman hydroboost, if not a quick drive to harbor freight and buy the assortment of Viton O rings.
 
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