TJ brake proportioning valve line locations

[Justin Honan]

Greetings

I have been upgrading my brakes to the Vanco big brake kit, new rear disc / caliper and black magic pads all around. My 2000 originally came as front disc/ rear drum with ABS. A while back I had Dana 44's front and rear out of an 06 Rubicon installed. I now have disc all around and the ABS has been deactivated. I have decided to change the prop valve to what a rubicon with all dics and ABS comes with as well as new lines for a non ABS TJ ( Felt it was time since I am putting I a new valve and all new brakes and hoses). The new lines will by-pass the ABS controller and go straight to the prop valve. I can not figure out how I should hook up the lines to the valve since I can not really tell where the lines go since they go in the abs box.

I have not been able to find an answer to this after scouring the inter webs for way too long and all pictures or diagrams I can find are small blurry ones from parts catalogs. If anyone can answer this or post a link/ photo I would greatly appreciate it. Also should the valve mount upright or on its side. In my Jeep it is on its side.

 

[pagrey]

PM @mrblaine, I'm sure he doesn't want you wasting time scouring the internet and/or is glad to help here.

 

[mrblaine]

PM @mrblaine, I'm sure he doesn't want you wasting time scouring the internet and/or is glad to help here.

Why privately? Isn't the info better posted publicly so more than one person can use it? That and it took all of 5 minutes to find this.
Orientation doesn't matter, flat or vertical. What does matter is that if you install it flat, the switch points to the left side of the vehicle.

 

[Justin Honan]

Thank You so much that helps a lot. Now I just need to properly straighten out all the brake lines from shipping. I am pretty sure I have identified which line goes where.

 

[Justin Honan]

Why privately? Isn't the info better posted publicly so more than one person can use it? That and it took all of 5 minutes to find this.
Orientation doesn't matter, flat or vertical. What does matter is that if you install it flat, the switch points to the left side of the vehicle.
View attachment 274350

Thank You very much!

 

[Chris]

Why privately? Isn't the info better posted publicly so more than one person can use it?

Yes, yes it is

 

[jorgebj]

Why privately? Isn't the info better posted publicly so more than one person can use it? That and it took all of 5 minutes to find this.
Orientation doesn't matter, flat or vertical. What does matter is that if you install it flat, the switch points to the left side of the vehicle.
View attachment 274350

I have a 1998 Sahara 4.0L. I hate to admit it, but somehow mistakenly place ATF fluid in the brake reservoir and my daughter drove it for a week and later shared the brakes were spongy. I know, I am an idiot which is costing me over $4k to fix. I quickly realized what happened and took it to my neighborhood mechanic who said I needed to all o-ring components in the master cylinder, ABS module, calipers, etc and the PROPORTIONING valve. My 1998 has ABS, but I am unable to find an ABS proportioning valve anywhere. It is discontinued and the only one I can find is a non-ABS one which looks like the picture above which has an extra port (purchased from online dealer from a junked 1998 Wrangler). One shop said to remove the cap (red arrow labeled "F" above), but when my mechanic when to attempt, he said he still could not get any pressure to go to the back brakes. Any thoughts? Can you convert a non-ABS to be ABS? Are there other sources for an ABS proportioning valve? Do I need to convert the whole system to non-ABS? If so, what does that look like.

Is there a way to rebuild my existing factory installed proportioning valve?

 

[mrblaine]

I have a 1998 Sahara 4.0L. I hate to admit it, but somehow mistakenly place ATF fluid in the brake reservoir and my daughter drove it for a week and later shared the brakes were spongy. I know, I am an idiot which is costing me over $4k to fix. I quickly realized what happened and took it to my neighborhood mechanic who said I needed to all o-ring components in the master cylinder, ABS module, calipers, etc and the PROPORTIONING valve. My 1998 has ABS, but I am unable to find an ABS proportioning valve anywhere. It is discontinued and the only one I can find is a non-ABS one which looks like the picture above which has an extra port (purchased from online dealer from a junked 1998 Wrangler). One shop said to remove the cap (red arrow labeled "F" above), but when my mechanic when to attempt, he said he still could not get any pressure to go to the back brakes. Any thoughts? Can you convert a non-ABS to be ABS? Are there other sources for an ABS proportioning valve? Do I need to convert the whole system to non-ABS? If so, what does that look like.

Is there a way to rebuild my existing factory installed proportioning valve?

All you need to do to convert the NON ABS to be an ABS version is plug the rear most port pointing at the firewall. The one marked RF Line is plugged with a special ORB plug. You can use a 3/16" inverted flare plug with 3/8-24 threads.

In other words, the only difference between the ABS and NON ABS combo valve pictured above is whether that port is plugged or not plugged. Inside between the RF Line port and the LF Line port is just a hole drilled for fluid to make both ports common to each other as a Tee. ABS needs only one line going to the pump where it splits out of the pump to go to both front wheels. NON ABS does the split at the combo valve.

 

[jorgebj]

Thanks. That is what he tried, but he said it wouldn’t push any fluid to the back breaks. Is it possible the equalizing drilled line you mentioned is plugged? Any way to clean or clear that port? Is it possible to rebuild a proportioning valve (mostly replace the rubber o-rings)?

 

[mrblaine]

Thanks. That is what he tried, but he said it wouldn’t push any fluid to the back breaks. Is it possible the equalizing drilled line you mentioned is plugged? Any way to clean or clear that port? Is it possible to rebuild a proportioning valve (mostly replace the rubber o-rings)?

It isn't pushing fluid because the shuttle valve is shifted. You have a brake light lit up on the dash with the key on and parking brake off, no?

 

[jorgebj]

Thanks for the quick response. Let me check

 

[Rickyd]

Greetings

I have been upgrading my brakes to the Vanco big brake kit, new rear disc / caliper and black magic pads all around. My 2000 originally came as front disc/ rear drum with ABS. A while back I had Dana 44's front and rear out of an 06 Rubicon installed. I now have disc all around and the ABS has been deactivated. I have decided to change the prop valve to what a rubicon with all dics and ABS comes with as well as new lines for a non ABS TJ ( Felt it was time since I am putting I a new valve and all new brakes and hoses). The new lines will by-pass the ABS controller and go straight to the prop valve. I can not figure out how I should hook up the lines to the valve since I can not really tell where the lines go since they go in the abs box.

I have not been able to find an answer to this after scouring the inter webs for way too long and all pictures or diagrams I can find are small blurry ones from parts catalogs. If anyone can answer this or post a link/ photo I would greatly appreciate it. Also should the valve mount upright or on its side. In my Jeep it is on its side.

Leave your stock valve where it is and swap the fitting at the rear
Post in thread 'Project Basketcase!' https://wranglertjforum.com/threads/project-basketcase.67755/post-1258270

Oops,old thread

 

[jorgebj]

The shop said the proportioning valve I need has two lines coming in the top and two out the bottom. He said they tried using the plug to block off the rear port, but it isn't allowing brake fluid to go to the rear brakes. The diagram they have shows the rear port they blocked off to be for the rear brakes. They seem to think that a non-ABS valve won't work and are trying to find a junk yard with an ABS version. I am playing middle man between this forum and them so any other insights are helpful.

 

[mrblaine]

The shop said the proportioning valve I need has two lines coming in the top and two out the bottom. He said they tried using the plug to block off the rear port, but it isn't allowing brake fluid to go to the rear brakes. The diagram they have shows the rear port they blocked off to be for the rear brakes. They seem to think that a non-ABS valve won't work and are trying to find a junk yard with an ABS version. I am playing middle man between this forum and them so any other insights are helpful.

Either they are full of it or someone has swapped in a non stock combination block. This is a cut-away picture showing the internals of what came in the vehicle stock. The right side of the picture points to the front of the rig. If you look at the left side, MC SEC is from the master cylinder into the block. The two ports marked Front Calipers are common to each other internally. The only difference in the ABS versus Non ABS versions is that adapter fitting that points straight at the firewall gets removed and is either threaded for a brake line to the other front caliper or is a plug to block off the port out to the other caliper. That is because the ABS pump only needs one line into it from the block and then it sends fluid out to both front calipers via the hardlines.

 

[mrblaine]

The shop said the proportioning valve I need has two lines coming in the top and two out the bottom. He said they tried using the plug to block off the rear port, but it isn't allowing brake fluid to go to the rear brakes. The diagram they have shows the rear port they blocked off to be for the rear brakes. They seem to think that a non-ABS valve won't work and are trying to find a junk yard with an ABS version. I am playing middle man between this forum and them so any other insights are helpful.

BTW- have them send over some pictures and post them up. There is no in the top and out the bottom on the TJ combination block. They go in the left side from the master and out the right side and rear.

 

[Rickyd]

The shop said the proportioning valve I need has two lines coming in the top and two out the bottom. He said they tried using the plug to block off the rear port, but it isn't allowing brake fluid to go to the rear brakes. The diagram they have shows the rear port they blocked off to be for the rear brakes. They seem to think that a non-ABS valve won't work and are trying to find a junk yard with an ABS version. I am playing middle man between this forum and them so any other insights are helpful.

You should have this valve in your jeep-

You absolutely should NOT be hooking a line to the red F port. But blocking off the one circled in blue.

Thats all you do.put the plug from your abs valve into the non abs valve.

 

[Rickyd]

One shop said to remove the cap (red arrow labeled "F" above), but when my mechanic when to attempt

absolutely not. Your mechanic attempted what? Did he try to hook the lines into the red f port like an idiot?

 

[mrblaine]

absolutely not. Your mechanic attempted what? Did he try to hook the lines into the red f port like an idiot?

The red F is not for the or a port, it signifies that is the FRONT of the valve when installed in the vehicle.

 

[Rickyd]

The red F is not for the or a port, it signifies that is the FRONT of the valve when installed in the vehicle.

Exactly