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'89 cherokee brake problem


 
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bennyboy
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Joined: 06 May 2007

PostPosted: Sun May 06, 2007 3:38 pm    Post subject: '89 cherokee brake problem Reply with quote

My brake problem started out with a very stiff pedal and hardly any braking. I tried several different things including bleeding the brakes, checking wiring, replacing hydrolic pump (stupid ABS system) and nothing worked.

I wanted to rid myself of this ineffective ABS system so I bought an '87 cherokee with standard brakes and swapped over the master cylinder and booster.

Now, the brake pedal is no longer stiff. It is now very soft. We bled the brakes several times several different ways and still have the same problem.

I removed the rear wheels and noticed the brakes are significantly different sizes. The older brakes are about 2" larger than the newer brakes.

I havent checked the fronts yet, But it seems that the rears would have larger bore wheel cylinders giving me that spongey, sinking brake pedal feeling.

The gear ratios are also different, so I cannot simply swap axles from 12 rig to the other. can I swap just the brakes fro the '87 to the '89? are they both c-clip axles? can I simply remove the axle shafts (and brakes) from the '87 and put them in the '89?

I am not sure if the fronts are different bore either.

The front of the '87 has that vacuum disconnect that I am not interested in puting in my '89.

thanks for the help Wink
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Brad The Best
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Joined: 14 Jan 2007
Location: Kamloops B.C Canada

PostPosted: Sun May 06, 2007 6:19 pm    Post subject: Reply with quote

is that all you did ? did you bleed the abs how the manual says to bleed it ? or just conventionally ? makes a big difference .

you could of just pulled the abs fuse to get rid of the abs .

you shouldn't have to swap axles just the backing plate , and all the brake components . ( if you are dealing with the same axles )

did the brakes work fine on the 87 ? before you took the master cylinder off it ? if they did im going to guess something like seized calipers or improper bleeding procedure .

so your saying you basically want to put all the brakes off the 87 on the 89 ? the rears are easy if you have the same axles . the fronts you might not be able to swap the rotors .
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Tardis
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Joined: 07 Aug 2004
Location: Ohio

PostPosted: Sun May 06, 2007 10:37 pm    Post subject: Reply with quote

The difference should be in the proportioning valve.
If you're not getting enough pedal pressure you might want to change out the proportioning valve.
Any junkyard will have one cheap.
Did you properly bleed the master cylinder?
Did you use the proportioning valve from the donor truck?
Did you adjust the rear brake shoes before you bled the brakes?
Did you try running the Jeep while testing the pedal feel?
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bennyboy
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Joined: 06 May 2007

PostPosted: Mon May 21, 2007 4:53 pm    Post subject: Reply with quote

I did swap the proportioning valve.
The engine was running while bleeding.
The rear shoes were adjusted.

What is the proper technique for bleeding the brakes?
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88WOWJ
Member


Joined: 12 Aug 2006
Location: Hinesville Ga

PostPosted: Thu May 24, 2007 5:07 pm    Post subject: Brake Problem 89 XJ Reply with quote

Bennyboy, I dont really understand what you are salvaging the brake
system from? You talk of ABS which didnt start in an XJ until 1990.
The 87-89 used cast iron rotors unlike the 1990 and up use composite
rotors. The front axle could be vacuum disconnect or without.
The rear brakes could be 9 inch or 10 inch depending on the year.
The 87-89 dont use c clips.
The master cylinder from the 87-91 are the same to include the YJ.
The booster is another hole story 87-91 use a single diaghram booster.
Not sure of the year but they went to a double diaghram booster.
They are not interchangable with out some serius mods.
_________________
1988 Wagoneer Limited XJ Tellico Tested
Rocklizards panels, Tomken rear bumper and front Tow brackets, Rocket air intake, 2 inch lift,
30x950x15, 1991 coolant system with electric fans, 8,000 mile marker winch
1991 Cherokee Limited
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