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Brake Issue, maybe Master Cylinder

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Old 03-15-2014 | 05:29 PM
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Newbie101's Avatar
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From: Pittsfield, MA
Year: 2000
Model: Cherokee
Engine: 4.0L
Default Brake Issue, maybe Master Cylinder

Hey all,

so yesterday on my way home from work my breaks started to act up. When coming from to a stop something strange starts to happen. The pedal almost seems to loose pressure for a second then regain it. This happens almost on a cycle like a warped rotor. Thing is i just had a brand new brake job about a year or so ago, and have this as my weekend driver. So low mileage and haven't really beaten the crap out of her to bad.

Any suggestions on what it may be?

Master Cylinder seals messing up? I don't see any external leakage with a visual inspection.

Let me know if anyone of you out here have had a similar issue.

Thanks,
Old 03-15-2014 | 08:54 PM
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1976Mustang's Avatar
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Year: 1992 Cherokee Sport
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Inspect your brakes. I've seen brand new rotors get ground into after 100 miles, and it doesn't take much to warp rotors. If they check out then yeah, your master cylinder's seals may have gone but it's not likely for them to just suddenly fail like that.
Old 03-15-2014 | 08:55 PM
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From: Bakersfield CA
Year: 1990
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ABS issue(if you have ABS) or could be the booster, booster vac line?
Old 03-15-2014 | 08:57 PM
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Originally Posted by highmileage
ABS issue(if you have ABS) or could be the booster, booster vac line?
AH I second this!! As a possibility that is. My ABS started acting up about a year ago. Ended up being a damaged speed sensor causing a false "0" reading. Never did fix it, part was over $200

I'd start with inspecting the ABS speed sensors, all you need to do is lay on the ground with a flashlight. not sure is the booster would cause that though.

Thn if all looks good, go ahead and pull you wheels and check all your brakes. Simple stuff first.
Old 03-17-2014 | 07:53 PM
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Year: 2000
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No ABS installed. Looking at the master cylinder.... haven't had a chance to pull the wheels off yet and inspect the brakes
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