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Old 09-10-2012, 05:35 PM   #1
Join Date: May 2012
Location: Central KY
Posts: 91
Master Cylinder?

My son's Jeep has no brake pedal pressure. The brakes work, but all the way at the floor. The fluid level is good and there are no leaks @ the wheel cylinders. Is this a master cylinder failure?

Thanks for your input.

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Old 09-10-2012, 09:04 PM   #2
jherrington's Avatar
Join Date: Jan 2012
Location: Baton Rouge
Posts: 2,105
My truck did this, and it was the master cylinder that was out. it could be air in the system and needs to be vented, but unless you have done a brake job any time soon, its probably the master cylinder. wish the best!

98 TJ sport 4.0L I6 356,000 miles.
No Engine, axle, tranny, or t-case rebuilds.
Check out my 5.3 swap in progress here!
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Old 09-10-2012, 11:06 PM   #3
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Join Date: Nov 2010
Location: Portland Oregon
Posts: 1,176
Yes, this is a bad master cylinder. Pretty easy fix, remove old, bench bleed the new one, put it on and bleed the brakes.
Warn M8000, KD Fabworks custom cage, Homemade sliders, 4:88, D44 ARB rear, Metalcloak arms and front track bar, Currie Currectlync, BFG KM2 35's ect....ect.
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Old 09-10-2012, 11:50 PM   #4
SeVeReDiStOrTiOn's Avatar
Join Date: May 2012
Location: CA
Posts: 768
Pump the brakes with the engine off...if it doesn't firm up and hold position there's probably an internal leak in the master. Did he just buy the jeep? If he did there could've been some brake work recently and might just need a good bleeding.
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