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Old 04-21-2012, 12:20 AM   #1
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How should YJ brakes feel?

Bought my first jeep yesterday and the brakes are taking some getting used to. I'm used to brakes that firm up and then you just push harder for more braking force. My YJ brakes go smoothly to the floor with almost no resistance but at about half way down the brakes start to work, at an inch or so from the floor they are at full force and pretty much lock up.

Is this normal or should I be replacing something?

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Old 04-21-2012, 12:29 AM   #2
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Sounds like you need to bleed the lines.

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Old 04-21-2012, 12:44 AM   #3
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Thanks, I have new brake lines coming as suggested by another person since they are stock lines in an 89' . I think I'll still bleed them tomorrow anyway.
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Old 04-21-2012, 07:46 AM   #4
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Is your brake booster working?
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Old 04-21-2012, 08:00 AM   #5
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Are you replacing brake lines because they are rusty or leaking or because someone said you should?

Take it one step at a time since you just bought it. Check the master cylinder to make sure you have fluid, pull all the wheels and check that the pads and shoes are OK and the front pistons and rear wheel cylinders aren't leaking.
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Old 04-21-2012, 08:47 AM   #6
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My yj brakes are very responsive and barely need to touch the pedal. I agree that you need to check fluids and parts and bleed lines.
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Old 04-21-2012, 09:01 AM   #7
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My brakes aren't stiff, but not soft. Though with 33s I don't expect to stop on a dime, though I can stop relatively quick, when needed. (Damn lights that change at the last second and make me slam on my brakes)
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Old 04-21-2012, 09:29 AM   #8
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Quote:
Originally Posted by brentd711 View Post
Are you replacing brake lines because they are rusty or leaking or because someone said you should?
Two reasons, the key being they are 23 year old stock lines in a rot prone area. I had the lines in a '93 blow out on me during a test drive. Also, I'm going to be doing around 4 inches of lift so I bought lines of the appropriate length.


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Is your brake booster working?
I'll research how to diagnose that and check it.



The rest of you make it sound like YJ brakes should be roughly like what I'm used to so these sound pretty well hosed. I'll be doing a full physical check on them today.
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Old 04-21-2012, 12:08 PM   #9
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Quote:
Originally Posted by brentd711 View Post
Are you replacing brake lines because they are rusty or leaking or because someone said you should?

Take it one step at a time since you just bought it. Check the master cylinder to make sure you have fluid, pull all the wheels and check that the pads and shoes are OK and the front pistons and rear wheel cylinders aren't leaking.
This. Chances are if there are no leaks the master cylinder is going bad.
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Old 04-21-2012, 07:12 PM   #10
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me brakes stop me when i stop moving and lines are old original ones!
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Old 04-21-2012, 07:59 PM   #11
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HARD LIKE A ROCK HARD LIKE --- LOL JUST KIDING
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Old 04-21-2012, 08:02 PM   #12
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They should work at random, pulling hard left forcing you to compensate by turning right. At least that's what I've been told and my experiences
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Old 04-21-2012, 08:48 PM   #13
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Quote:
Originally Posted by kik View Post
This. Chances are if there are no leaks the master cylinder is going bad.
The master cylinder is full. I've not had a chance to check for leaks yet. Today got busy.


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They should work at random, pulling hard left forcing you to compensate by turning right. At least that's what I've been told and my experiences
Actually, mine doesn't pull at all.
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Old 04-22-2012, 10:22 PM   #14
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Replaced it all on my 87. The hard lines were starting to go.
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Old 04-23-2012, 05:52 AM   #15
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Sounds like my brakes too. Squishy, then responsive, squishy, then squeeky... drives me crazy.
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Old 04-23-2012, 06:33 AM   #16
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I have all new brakes, calipers, pads, cylinders, shoes, lines and master cylinder.

They didn't really act right til i got a nerw master cylinder. I took it apart and the seals where gone in it just forcing the brake fluid back intot he cylinder when I would brake.

My brakes are as good as they have ever been but not the best i've ever had. The pedal is stiff once pushed down about an inch but it starts engaging right away. Mine does not pull at all. 40 mph hard stop with no hands on the wheel.

I usually use the trans to stop and slow more than anything. Even in an emergancy stop I have already downshifted and cluthed out.
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Old 04-23-2012, 09:38 AM   #17
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mine are pretty soft, anyone who drives it tells me they are. never bothered me or given me any problems though
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Old 04-23-2012, 09:44 AM   #18
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Quote:
Originally Posted by denisbaldwin View Post
Sounds like my brakes too. Squishy, then responsive, squishy, then squeeky... drives me crazy.
Mine are actually consistent, they just have no tactile resistance when I push the peddle. I still stop good though.


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They didn't really act right til i got a nerw master cylinder. I took it apart and the seals where gone in it just forcing the brake fluid back intot he cylinder when I would brake.
I would think it was the master cylinder but I've sat at a light for 5 minutes without having to pump the brakes at all, so I don't believe its seals are bad.



I've still yet to get out there and check for leaks and bleed them. Got busy and then yesterday was poring down buckets of rain, wouldn't be able to see leaks anyway. Today maybe.
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Old 04-23-2012, 07:39 PM   #19
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Quote:
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Mine are actually consistent, they just have no tactile resistance when I push the peddle. I still stop good though.




I would think it was the master cylinder but I've sat at a light for 5 minutes without having to pump the brakes at all, so I don't believe its seals are bad.



I've still yet to get out there and check for leaks and bleed them. Got busy and then yesterday was poring down buckets of rain, wouldn't be able to see leaks anyway. Today maybe.
Mine still stopped I just had very little pedal feel. it would go to the floor basically but i would stop. It would also pump up and get sorta hard but then it would loose pressure the next time i'd brake.
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Old 04-23-2012, 11:46 PM   #20
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Quote:
Originally Posted by 95YamJam View Post
Mine still stopped I just had very little pedal feel. it would go to the floor basically but i would stop. It would also pump up and get sorta hard but then it would loose pressure the next time i'd brake.
I'll update after line replacement and bleed. Should be here this week.
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Old 04-24-2012, 06:40 AM   #21
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Has anyone tried to rebuild ur m.c. I have never done it I know it can be done and a lot cheeper then getting a new one
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Old 04-24-2012, 08:48 AM   #22
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Has anyone tried to rebuild ur m.c. I have never done it I know it can be done and a lot cheeper then getting a new one
No, I'll investigate all that if everything else fails. Our weather has been crap so I haven't been out to try anything yet. It looks like today may be the day.

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