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post #1 of 4 Old 12-06-2006, 08:19 AM Thread Starter
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2005 TJ Wrangler 
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Location: Peabody, MA
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brake question

My brake have been feeling spongy and soft so i checked out my master cylinder to check the fluid, and the front smaller compartment is empty. im going to fill it up today when i swing by autozone for some fluid. but what are the 2 compartments for? why is the front one empty? could there be a leak and have one empty and have the other still work? my brake have been progressivly getting worse, faster then pads wear. Thanks, you guys are always a help.

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post #2 of 4 Old 12-06-2006, 08:50 AM
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So the smaller compartment is fluid for the rear brakes. They have two separate chambers so it it isolates the front from the rear providing some redundancy in case of failure.

So if you have no fluid in the small chamber, it means you probably have a leak. Check both wheel cylinders in the rear for leaks. You may have to replace them and then bleed the brakes once you fill the fluid.

1992 Black YJ, 4L I6, 8.8 Rear
3.5" BDS, 5/8" MORE Shackles,
DT-3000s, 16x8 Bajas,
285/75R16 Dunlop Mud Rovers
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post #3 of 4 Old 12-06-2006, 09:56 AM
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You will definitely have to bleed the rear brakes.

Also the leak may be in the line that runs from the proportioning valve
to the rear axle or a line on the rear axle could also be leaking.
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post #4 of 4 Old 12-06-2006, 10:00 AM Thread Starter
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redundancy in case of failures, like mine. good going jeep engineers, so right now im just stopping with the front brakes huh? ok. so i just trace the line from the smaller compartmenmt to the back of the jeep until i find something wet. cool. thanks guys. i think its time for new pads anyway.
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