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Old 10-03-2010, 08:14 PM
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Thumbs down Blindman

I have a 97 wrangler 6cyl 5spd w/ABS. when you apply the brakes it starts to stop but the pedal continues almost to the floor. The first time you do this the brake light comes on but if you pump it the pedal comes up a little bit and you can stop the vehicle. I have replaced master cylinder and put new pads on the front. and bench bled the MC and bled all the brakes starting with the furthest away to closets. and it make no diference. I'm at a loss as to what to do next.
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Old 10-03-2010, 08:20 PM   #2

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bad brake booster, bad caliper, leak someplace?

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Old 10-03-2010, 08:46 PM   #3
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X2 on the bad brake booster. My Chevy is under work right now for the same reason and I found a crack in the booster.
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up, Savvy gas tank skid.

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Old 10-04-2010, 04:37 AM   #4
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Small leak in rear drum

"locked and loaded"
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Old 10-04-2010, 05:08 AM   #5
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Check the master cylinder, if it is low add some and see if it improves. If it does not and no leaks are found it may be the master cylinder. I think if the booster was bad the power assist would not work and the pedal would be hard and not affect the travel.
Retired my 94 YJ 4cyl 5spd @ 200K
Now in a 04 TJ 4cyl 5spd CV @120K+
Both as a commuter vehicle in NW, NJ
April 2012.downsized and now a 99er.
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Old 10-04-2010, 11:23 AM   #6
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Definatly not the booster itself.
Could be a defective Master cylinder.

The light coming on indicates the pressure in one end is greater than the other.

Rear brakes adjustment? Have you looked at them? It could be the adjustment is too loose.

One way to tell - pull up on the parking brake handle to find out where it starts to get tight. Now loosen it slightly.
Drive it - the first time you press the pedal it will be as before, but subsequent pushes it'll feel normal.

Putting the E brake on slightly tightens the shoes - if they were too loose, it will feel like it should. If it doesn't help, suspect air in the lines, either front or rear.
Most folks do not bleed the air out properly.

Let us know, we can guide you trough the RIGHT WAY to adjust the rears, or the RIGHT WAY to bleed all the air out, depending.

It's no wonder the country is falling apart - stupidity abounds!
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