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#Intermittently brake pedal goes to the floor while driving

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 Post subject: Intermittently brake pedal goes to the floor while driving
PostPosted: Sun Mar 13, 2016 10:07 pm 
First Gear
Joined: Thu Apr 26, 2012 1:41 pm
Posts: 164
Location: Middletown, CT
Hi everyone,

Sporadically, maybe once or twice a month, the brake pedal will go to the floor when trying to come to a stop. Not losing any brake fluid externally. Seems like a master cylinder issue. But I personally have only experienced permanent malfunctions of the brake master cylinder; as opposed to this sporadic issue. Just putting a feeler out there to see if anyone has experienced this. If not, I will proceed with master cylinder replacement. I did replace the master cylinder once before; for a different issue and I also installed the GrimmSpeed master cylinder brace.

Thank you,

Chris

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94 Legacy GT
95 BMW (E36) 325ic
81 BMW (E12) 528i
04 Outback
02 Acura TL Type S


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 Post subject: Re: Intermittently brake pedal goes to the floor while drivi
PostPosted: Mon Mar 14, 2016 6:15 am 
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Joined: Tue Aug 25, 2009 7:52 am
Posts: 4729
Location: Des Moines, Wa
See if the check valve in the hose going between the brake booster and the manifold is possibly leaking the direction no air should go. I think I remember having that before. But more likely the MC is the culprit.

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1992 Legacy SS 5mt, build in progress


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 Post subject: Re: Intermittently brake pedal goes to the floor while drivi
PostPosted: Mon Mar 14, 2016 3:53 pm 
First Gear
Joined: Thu Apr 26, 2012 1:41 pm
Posts: 164
Location: Middletown, CT
Hey Mike,

Thanks for the advice. I did have the issues with the check valve freezing and I had to give the valve a blast of WD-40 and some other solution to rid the valve of moisture (maybe dry gas) ? Maybe it's time for a new valve ? ...if they are still available ?

Having a hard time finding the pipe that has the check valve inside of it on the online electronic parts catalog. If anyone could provide the part number, that would be appreciated.

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94 Legacy GT
95 BMW (E36) 325ic
81 BMW (E12) 528i
04 Outback
02 Acura TL Type S


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 Post subject: Re: Intermittently brake pedal goes to the floor while drivi
PostPosted: Tue Mar 15, 2016 4:18 pm 
First Gear
Joined: Thu Apr 26, 2012 1:41 pm
Posts: 164
Location: Middletown, CT
I ordered the vacuum pipe that has the non-return valve inside $22. I couldn't find the part number on the diagrams on parts.subaru.com, but the brake booster diagram at the dealer provided more details.

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94 Legacy GT
95 BMW (E36) 325ic
81 BMW (E12) 528i
04 Outback
02 Acura TL Type S


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