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Unread 04-04-2011, 12:38 PM   #1
Manche87
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1998 XJ Cherokee 
 
Join Date: Sep 2009
Location: Buffalo, NY
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Brake proportioning valve?

I have a 98 xj, see profile for all specs, that is having brake issues. It will stop but when it sits for an hour or or two when I hit the brake pedal the rear wheels will lock up, from there it only feels like the rear brakes are catching. I have had this problem for a while now, put new front pads, rotors and calipers on but the problem persists. Does it sound like possibly the proportioning valve? Or could it be something else?

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Unread 04-04-2011, 01:08 PM   #2
CJ7-Tim
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Do the front brakes work or not ? Are the rear brakes recently rebuilt or not ? Cheap rear brake pads often are touchy until they get warmed up. Replacing cheap parts with good quality brake pads often cures rear brake grabbing.

When did you last last flush and 100% replace the brake fluid ?
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Unread 04-04-2011, 01:16 PM   #3
Manche87
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Front brakes work but only after using the brakes a few times. For example I start my jeep in the morning and the first 3-4 stops come to a screeching halt at the rear wheels. After that I can feel the front brakes grab bit not nearly as strong as the rear. I have not replaced my rear brakes in my time I have owned the jeep (2 years). I have never drained or refilled any brake fluid in the time I've owned it
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Unread 04-04-2011, 01:42 PM   #4
CJ7-Tim
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Are you sure there is no air in the brake lines, you bled the brakes properly ?

Are you sure the front brakes don't work, or are just assuming they don't work because that what it "feels" like ? If you clamp off the rear soft brake line, you can test the front brake function.

If you are positive that the front brakes don't work, suspect that the front soft brake lines may have broken down and need to be replaced. Also consider that the master cylinder may need to be replaced.

No matter what you do you should 100% replace the brake fluid, it attract water and retains contaminates that can destroy your brake components.
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Unread 04-04-2011, 01:49 PM   #5
Manche87
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I have not bled the brakes at all, just wanted to get input before I did any work at all. As far as the front brakes not working, I'm almost 100% sure they do. They definitely do not feel like it tho. The rear def grab the most to the point where I know it doesnt feel right. I will try bleeding them and replacing all the fluid and go from there.
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