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Unread 02-15-2013, 11:37 AM   #1
old_beater
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brake boost on hydro drive abs brake system

I lost my power assist on my braking system. it's on a 90 cherokee laredo with abs I was told it would probably be the hydro pump that went bad but that part is listed at 500+, is there any other (cheaper) parts that could cause this same problem?

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Unread 02-15-2013, 11:44 AM   #2
1990JEEPXJ
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That system is prone to failure. You're
better off ditching the ABS for a conventional booster/master cylinder set up
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Yea, and I thought it was one of the 11 Commandments:
11) Thou shalt love, cherish, and honor till death, thine square headlights above all other earthy things sayith the Lord.
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Unread 02-15-2013, 11:51 AM   #3
old_beater
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how do I switch out over?
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Unread 02-15-2013, 12:04 PM   #4
AZ Jeff
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Quote:
Originally Posted by old_beater View Post
how do I switch out over?
If you use the search function for "removing 1990 ABS" or similar, you will find lots of info on this, but the summary is as follows:

1. Acquire vacuum power booster, master cylinder, and proportioning valve for 1995-1996 model.
2. Remove your existing pump, accumulator, and distribution system. Save all hard lines for possible reuse.
3 Install parts from step one.
4. Fabricate hard lines to connect various ports and install same
5. Bleed system.
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Unread 02-15-2013, 12:16 PM   #5
old_beater
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ok where does the vacuum line come from for the booster.
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Unread 02-15-2013, 12:44 PM   #6
buildin1XJ
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From the intake manifold.
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Unread 02-15-2013, 01:11 PM   #7
1990JEEPXJ
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Yes. There is a plug on the manifold. Remove it and out in the appropriate nipple. You can also use the booster and master from a WJ. same performance and work to install. Just fits a little better with regards to the washer bottle.
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Quote:
Originally Posted by Joe Dillard View Post
Yea, and I thought it was one of the 11 Commandments:
11) Thou shalt love, cherish, and honor till death, thine square headlights above all other earthy things sayith the Lord.
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Unread 02-15-2013, 01:25 PM   #8
old_beater
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they list 90's with conventional boosters should I get that or the setup from a 95-96
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Unread 02-15-2013, 02:39 PM   #9
kstopp
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90's up to 94 have a single diaphragm booster. 95-96 have double diaphragm booster as do the WJs from 99-04.

Double diaphragm means more braking power, I would suggest you go that route.
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Unread 02-15-2013, 02:54 PM   #10
old_beater
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cool thanks guys thats the route I'm headed
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Unread 03-01-2013, 06:49 PM   #11
old_beater
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alright the conversion to a vacuum booster is done! everything works great it was just rough getting it all bled
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