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  #1  
Old 05-21-2011, 05:57 PM
spockmckoy spockmckoy is offline
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Exclamation anti-lok brakes OR master cylinder??

HI, While working on my truck to resolve 2 problems, a possible 3rd has come up. While twice coming to a stop, my truck slowed down, almost to a complete stop and then the pedal went soft/to the floor. I quickly released my foot and reapplied the brake and all was fine. I looked for fluid leaks, but none. I checked the brake res and full of fluid. How does one determine if this is a master cylinder problem OR as someone suggested to me the 'anti-lok- brake sensors have gone bad. I am not sure how to test either. I am going to plug my laptop into my truck to see if there is a code on the brake system or not. Any thoughts/similar problems and what did you find????
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Old 05-21-2011, 06:37 PM
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I would think about air in the brake lines, maybe from a very small hole in the rubber lines or maybe the fluid was low at some time, also you need to check the Booster brake canister hose
wipe off your whole master cylinder, then drive it around, check again for wetness
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Old 08-09-2011, 09:40 PM
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cabnfevr cabnfevr is offline
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If you had air in the sytem your pedal would be spoungie all the time. It sounds like your gettig blowby in your mstercylider. Meaning it's leaking internally. If your abs sensors were bad you would get an abs prk light & you would get speratic vibration in your pedal like the abs was kicking in because of a wet surface stop. I've had both probs before on various vehs not just mopars.
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Old 10-02-2011, 11:01 PM
RedneckMechanic RedneckMechanic is offline
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I agree with Cabn. Sounds like the cups in your master are shot. Once enough pressure has been applied, the rubber moves allowing the brake fluid past. As Cabn said, if it were an ABS issue, you'd have a light or pulsation in the pedal. If it were a leak of any kind, your fluid level would go down. Especially if it happened that fast. I'd be looking at replacing the master.
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Old 10-05-2011, 01:58 PM
Gen1dak Gen1dak is offline
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Yeah, definitely thinking master cylinder. A failed ABS sensor isn't going to give you those symptoms. Air or a failed master cylinder, as has been stated above, will behave this way.
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Old 10-05-2011, 02:28 PM
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^agree MC, you can rebuild them it's pretty easy.
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