Coilovers on ZJ-Brake question? - JeepForum.com
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post #1 of 28 Old 01-26-2013, 01:16 AM Thread Starter
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Coilovers on ZJ-Brake question?

Ok guys, I have a question hopefully someone can help me out. (A little long)

I am in the process of installing coilovers on my ZJ and ran into a little problem with the drivers side (HCU=Hydraulic Control Unit) that is located by the brake booster.

From my research it looks like it would be fine to bypass/remove the HCU since it is not used with normal braking, it is only used during antilock braking.

The jeep is 98% desert toy and is rarely used on the road, if i do use it on the road it is just to work and back which is like 5 minutes away. Do any of you see any problems removing the HCU?








In my research i found some pictures and it looks like they removed the HCU, i sent them a message on FB but no answer yet.






www.desert-hooligans.webs.com


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I like happy endings :2thumbsup:
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post #2 of 28 Old 01-26-2013, 04:08 AM
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Let us know what the answer is.

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post #3 of 28 Old 01-26-2013, 06:59 AM
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Yes you can remove that.

There's a thread on MC with helpful info on the prop valve. I'll see if I can find it.
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post #4 of 28 Old 01-26-2013, 08:47 AM
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Yes, I've removed mine.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #5 of 28 Old 01-26-2013, 09:31 AM Thread Starter
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Thanks ratmonkey, so do you just block off the lines that go from the booster bottle to the hcu?

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Quote:
Originally Posted by CarolinaWK View Post
I like happy endings :2thumbsup:
RIP Troy Edwards (bigbluezj94)
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post #6 of 28 Old 01-26-2013, 01:27 PM
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you'll need to run a new line to the rear and a new line to the driver's front. there isn't enough tube there to reach to the prop valve.
you'll need a brake line t block, some 3/8 24 double flare fittings, double flare tool, and you'll have to reuse the fittings that go to the prop valve, they're metric i think.
run a short line from the front output to the t-block, plumb the front wheels into that. then run a line from the rear output to the back. easy. it did take longer than normal for me to bleed, but i also put bone dry calipers on each corner too.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #7 of 28 Old 01-26-2013, 04:25 PM
melk
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I believe the stock prop valve has 2 outputs for the front and 1 for the rear.

One is blocked off from the factory as it uses just one front input to the abs pump which then splits it.

So, remove the pump, and you can then just hookup the second front input and done.

At least that was my understanding from the walk through that I read.
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post #8 of 28 Old 01-26-2013, 04:36 PM
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The proportioning valve can be mounted any way. They use a spring, piston and pressure to work, nothing that would require gravity or specific orientation to work.
Attached Thumbnails
image-3320581783.jpg  
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post #9 of 28 Old 01-27-2013, 09:57 AM
ratmonkey
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The prop valve on my 97 doesn't have that extra port.
The fitting size going from the abs unit to the brakes is also different from what goes out of the proportioning valve as well.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #10 of 28 Old 01-27-2013, 11:17 AM
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http://mallcrawlin.com/forum/showthr...-System-Delete

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post #11 of 28 Old 01-27-2013, 10:53 PM Thread Starter
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Thanks Melk and nstystang, i will be checking my prop valve and hopefully its pretty easy.

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Quote:
Originally Posted by CarolinaWK View Post
I like happy endings :2thumbsup:
RIP Troy Edwards (bigbluezj94)
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post #12 of 28 Old 01-28-2013, 12:18 AM
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I have a dumb question... what does that piece do?

98' ZJ 4.0
4.5" short arm, 33" Courser MXTs, custom stubby bumper, skids, someother stuff
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post #13 of 28 Old 01-28-2013, 08:26 AM
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Which piece?
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post #14 of 28 Old 01-28-2013, 08:52 AM
nicklopic
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The one that's being removed for the coilovers
Just in front of the master cylinder

98' ZJ 4.0
4.5" short arm, 33" Courser MXTs, custom stubby bumper, skids, someother stuff
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post #15 of 28 Old 01-28-2013, 09:14 AM
melk
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That is the ABS pump. Brake fluid flows from the master cylinder through it to the proportioning valve and it out through the brake lines. If you want to you can remove the ABS pump.
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