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#2447586 - 02/06/18 05:13 PM Need Brake Help
CHRGR69 Offline
pro stock

Registered: 06/07/05
Posts: 1425
Loc: Florida
89 Dakota 2WD 3.9 V6. Pedal goes to the floor with engine on or off. Won't pump up to a hard pedal. No leaks, MC full. With engine off, pumping pedal, I hearing a swooshing air sound. Brake light does come on and off when running. I can stop, but its not safe. No intake leaks at power booster hose or check valve. Bad valve?? I should add that sometimes the MC needs fluid and the rubber gasket on the cap has popped its nipple. But again, no visible leaks??


Edited by CHRGR69 (02/06/18 09:35 PM)
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#2447644 - 02/06/18 06:36 PM Re: Need Brake Help [Re: CHRGR69]
RapidRobert Offline
Circle Track

Registered: 11/20/03
Posts: 34310
Loc: Lincoln Nebraska
the light has come on either cuz there was a leak on one side of the system or the MC fluid got low enough on one half that the normal psi on one side pushed the electrical valve over to the low psi side till the light came on (that is what it is there for, to warn you). find/fix the leak then bleed the MC first then bleed the fronts then the rears till you get a high & tight pedal & if the light is still on (safety wise you are fine it just needs to be reset) & do that by cracking a bleeder on one side & have a helper jab the pedal to shift the valve back to "centered" in the prop valve & it will be out. be carefull not to lift pedal till he closes the bleeder to avoid drawing air back up into the system & I ain't sure which "side" sprung the leak but when fixed you open a bleeder on the opposite side. which "half" was the leak on (if it was a leak). PS out a block of wood under the pedal so that it does not go lower than "normal" & this helps your helper control/stop the movement way better.


Edited by RapidRobert (02/06/18 06:38 PM)
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live every 24 hour block of time like it's your last day on earth

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#2447654 - 02/06/18 06:43 PM Re: Need Brake Help [Re: RapidRobert]
CHRGR69 Offline
pro stock

Registered: 06/07/05
Posts: 1425
Loc: Florida
What's up RR? Long time no talk. Anyway, there is no leak to be found.
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Grandma always said I had "hands of gold"!

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#2447665 - 02/06/18 06:50 PM Re: Need Brake Help [Re: CHRGR69]
RapidRobert Offline
Circle Track

Registered: 11/20/03
Posts: 34310
Loc: Lincoln Nebraska
Yes it has been awhile. Yeah there's still some air in there & I'd bleed the MC then the fronts then the rears
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live every 24 hour block of time like it's your last day on earth

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#2447689 - 02/06/18 07:17 PM Re: Need Brake Help [Re: RapidRobert]
CHRGR69 Offline
pro stock

Registered: 06/07/05
Posts: 1425
Loc: Florida
up
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Grandma always said I had "hands of gold"!

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#2447771 - 02/06/18 09:01 PM Re: Need Brake Help [Re: CHRGR69]
RTSrunner Offline
pro stock

Registered: 11/03/03
Posts: 1383
Loc: Pittsburgh,PA
Since there are no external leaks,the master cylinder could be bad and leaking internally between the bore chambers.No fluid loss into the booster/vacuum line either correct?

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#2447788 - 02/06/18 09:13 PM Re: Need Brake Help [Re: RTSrunner]
CHRGR69 Offline
pro stock

Registered: 06/07/05
Posts: 1425
Loc: Florida
Correct, everything is dry
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Grandma always said I had "hands of gold"!

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#2447900 - 02/07/18 05:38 AM Re: Need Brake Help [Re: CHRGR69]
ruderunner Offline


Registered: 12/18/14
Posts: 2001
Loc: ohio
Sounds to me like a bad master

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#2448085 - 02/07/18 02:13 PM Re: Need Brake Help [Re: ruderunner]
CHRGR69 Offline
pro stock

Registered: 06/07/05
Posts: 1425
Loc: Florida
In fact it was! Had one tucked away for a rainy day. All better now. Thanks guys!!
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Grandma always said I had "hands of gold"!

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