Wierd Brake Issue . . . - JeepForum.com

 
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post #1 of 7 Old 10-30-2010, 11:09 AM Thread Starter
YJ Newby
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1990 YJ Wrangler 
 
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Wierd Brake Issue . . .

I recently changed the front brakes on my '90 YJ and completely bled the lines [Bled into a clear beer bottle until the new, clear fluid I was adding to the master came through]. I never really had tight brakes since then. Now, in the past week or so, there is absolutely no resistance when applying the brakes until the pedal is depressed almost half way. At that point I really have to mash down on them to get good stopping power. The wierder part [is that a word?], is that I do not have brake lights until I have pressed down beyond the "spongy" period and start getting resistance. Am I looking at a new Master Cylinder?

Thanks for your replies . . .

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post #2 of 7 Old 10-30-2010, 01:32 PM
Mobile_Homie
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I would try bleeding again. Did you change the calipers?? If so, just be sure the bleeder is to the bottom, they can be installed on the wrong sides and if the bleeder is on top, you will never get the air out.

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post #3 of 7 Old 10-30-2010, 03:53 PM
Mark05059
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Quote:
Originally Posted by Mobile_Homie View Post
I would try bleeding again. Did you change the calipers?? If so, just be sure the bleeder is to the bottom, they can be installed on the wrong sides and if the bleeder is on top, you will never get the air out.
The bleeder goes to the top so the air comes out. Air rises to the top of the master since the brake fluid is heavier then air. You then open the bleeder and push the air at the TOP out.

Bleeder screws to the top

1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
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post #4 of 7 Old 10-30-2010, 10:51 PM
K4KAS
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Already stated above. A left caliper will install on the right side and vise verse. Ensure the caliper is installed with the bleeder screw to the top. They may have given you 2 of the same side caliper.
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post #5 of 7 Old 10-31-2010, 08:30 AM
MWT
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your master cylinder is bad.
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post #6 of 7 Old 10-31-2010, 08:40 AM
Mark05059
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Originally Posted by MWT View Post
your master cylinder is bad.


Not always the case. Could be air in the lines as well.

1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
|---L--[]lllllll[]-
()_) ()_)==O=)_)
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post #7 of 7 Old 10-31-2010, 12:05 PM
Old4X
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Re-set the proportionating valve. Then re-bleed the system, start at back right wheel, end with front left.

418 miles on 19 gallons of gas. Can't beat the BBD !
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