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bad brakes

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viper24242
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Joined: 08 Jul 2005
Location: Harrisonburg, VA

PostPosted: Tue Jan 09, 2007 4:31 pm    Post subject: bad brakes Reply with quote

So I went wheeling a while back and my brakes have felt a bit funny ever since. When I first push the pedal down its really soft, then if I take my foot off the pedal and press down on the brake again quickly it firms up bit braking still isn't all that great. If I am on a long decent down a mountain road and do the same thing the brakes pump up and then will start to fade pretty quick. I've only had the time to get under and check out the lines and they seem to be fine and i don't see any leaking from the brake calipers.

Are there any checks I can do to narrow down the probable cause? Also I plan on bleeding my brakes and then checking and replacing the master cylinder. I have not blead brakes before but have read the write up on the site that thephantum did. Is there anything special about zjs that I need to know about?

Thanks guys.
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ehirner
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Joined: 01 Jan 2004
Location: Eastern PA

PostPosted: Tue Jan 09, 2007 5:56 pm    Post subject: Reply with quote

You're likely looking in the wrong direction by thinking the master cylinder, hard lines, or air in the system.

What kind of wheeling did you do? Any water and/or mud? If yes, then start by disassembling your brakes and cleaning them. Mud and dirty water don't mix well with brakes.
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viper24242
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Joined: 08 Jul 2005
Location: Harrisonburg, VA

PostPosted: Tue Jan 09, 2007 7:25 pm    Post subject: Reply with quote

Yup, lots of mud and water. In fact the night we went out there was a lot of water, more than usual. It was also pretty cold. Just out of curiosity, if pads or rotors are heated up by a lot of braking force then are put through cold water could that damage the pad by cracking the material?
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'94 Grand 5.2L
2" budget boost
31" mud kings
Flowmaster 50
Rusty's air tube
Rusty's steering stabilizer
AEM throttle body spacer
120 amp alternator upgrade
Rusty's Tie Rod Conversion
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ehirner
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Joined: 01 Jan 2004
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PostPosted: Tue Jan 09, 2007 7:39 pm    Post subject: Reply with quote

The damage is more likely from dirt and debris contaminating the rotor/pad surface. Disassemble, clean, lubricate, reassemble.
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1fox2go
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Joined: 01 Dec 2004
Location: Fishersville, Virginia

PostPosted: Tue Jan 09, 2007 9:59 pm    Post subject: Reply with quote

mine were the same way, i almost wore the pads down to the shoe in the rear drums, im pretty sure thats your problem as well

goof news its like a 40 buck fix, bad news drums are kinda a pain to do
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viper24242
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Joined: 08 Jul 2005
Location: Harrisonburg, VA

PostPosted: Wed Jan 10, 2007 8:35 am    Post subject: Reply with quote

Well, the brake pads are only about 6 months old. I had them replaced back in june. I hope and doubt that I have worn them down in only 6 moths. Hopefully sometime this weekend I will have the time to get things taken care of.
_________________
'94 Grand 5.2L
2" budget boost
31" mud kings
Flowmaster 50
Rusty's air tube
Rusty's steering stabilizer
AEM throttle body spacer
120 amp alternator upgrade
Rusty's Tie Rod Conversion
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1fox2go
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Joined: 01 Dec 2004
Location: Fishersville, Virginia

PostPosted: Wed Jan 10, 2007 12:33 pm    Post subject: Reply with quote

yea good luck too mine were only 8 months old...mud kills em
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viper24242
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Joined: 08 Jul 2005
Location: Harrisonburg, VA

PostPosted: Wed Jan 10, 2007 1:11 pm    Post subject: Reply with quote

Wow. What company made your brakes fox? Is there anything out there that is more durable? I don't get out a wheel as much as you unfortunatly. I've been thinking about getting some drilled and slotted rotors but I was waiting till these pads wore out. I was just hoping it would take a little bit longer.
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'94 Grand 5.2L
2" budget boost
31" mud kings
Flowmaster 50
Rusty's air tube
Rusty's steering stabilizer
AEM throttle body spacer
120 amp alternator upgrade
Rusty's Tie Rod Conversion
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ehirner
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Joined: 01 Jan 2004
Location: Eastern PA

PostPosted: Wed Jan 10, 2007 2:06 pm    Post subject: Reply with quote

viper24242 wrote:
Wow. What company made your brakes fox? Is there anything out there that is more durable? I don't get out a wheel as much as you unfortunatly. I've been thinking about getting some drilled and slotted rotors but I was waiting till these pads wore out. I was just hoping it would take a little bit longer.

Stay out of the mud.

Don't waste your money on the drilled and slotted rotors. Those holes and slots trap dirt and mud more easily and will eat up pads even faster.
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viper24242
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Joined: 08 Jul 2005
Location: Harrisonburg, VA

PostPosted: Wed Jan 10, 2007 3:39 pm    Post subject: Reply with quote

ehirner wrote:
Stay out of the mud.


But I like the mud. But I will stay away from the slotted and drilled rotors.
_________________
'94 Grand 5.2L
2" budget boost
31" mud kings
Flowmaster 50
Rusty's air tube
Rusty's steering stabilizer
AEM throttle body spacer
120 amp alternator upgrade
Rusty's Tie Rod Conversion
Back to top
View user's profile Send private message Send e-mail
1fox2go
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Joined: 01 Dec 2004
Location: Fishersville, Virginia

PostPosted: Wed Jan 10, 2007 3:57 pm    Post subject: Reply with quote

my pads came from napa, ehirner is right the more mud you go in the faster they die, i guess you could pop the drum off and clean the brakes after each outing
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96 Cherokee 7.5 inch TnT long arm Locked F/R, D44 rear, 4.56s, 35x12.50 Muds/36x12.50 TSLs
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ehirner
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Joined: 01 Jan 2004
Location: Eastern PA

PostPosted: Wed Jan 10, 2007 3:58 pm    Post subject: Reply with quote

1fox2go wrote:
i guess you could pop the drum off and clean the brakes after each outing

If you don't want to stay away from mud...then this is about the best you can do. Disassemble and clean every time you're out.
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1fox2go
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PostPosted: Wed Jan 10, 2007 4:00 pm    Post subject: Reply with quote

or convert to rear discs that would make your brakes last a little bit longer
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ehirner
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Location: Eastern PA

PostPosted: Wed Jan 10, 2007 4:12 pm    Post subject: Reply with quote

1fox2go wrote:
or convert to rear discs that would make your brakes last a little bit longer

They still pick up dirt and debris regardless of brake type...disc or drum...and should be disassembled and clean each time you go mudding.
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viper24242
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Joined: 08 Jul 2005
Location: Harrisonburg, VA

PostPosted: Sun Jan 14, 2007 9:34 pm    Post subject: Reply with quote

So what does it mean when the emergency brake light comes on when I am pushing down on the brake and it feels kind of spongy? That kind of freaked me out a little bit. Brakes are a little low but are still ok.
_________________
'94 Grand 5.2L
2" budget boost
31" mud kings
Flowmaster 50
Rusty's air tube
Rusty's steering stabilizer
AEM throttle body spacer
120 amp alternator upgrade
Rusty's Tie Rod Conversion
Back to top
View user's profile Send private message Send e-mail
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