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  #31  
Old October 26th, 2017, 16:36
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spidermikey88 spidermikey88 is offline
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Re: Booster Upgrade

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Originally Posted by muddypunk View Post
What did you do about the prop valve?

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I kept the original prop valve and then took the brake lines from the WJ master cylinder and had the fittings replaced on the prop valve side. I still have drum breaks in the rear so I didn't want to use the WJ's valve. I can take some pics tonight if you want to see any it.

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  #32  
Old October 26th, 2017, 16:37
muddypunk muddypunk is offline
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Re: Booster Upgrade

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Originally Posted by spidermikey88 View Post
I kept the original prop valve and then took the brake lines from the WJ master cylinder and had the fittings replaced on the prop valve side. I still have drum breaks in the rear so I didn't want to use the WJ's valve. I can take some pics tonight if you want to see any it.

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That would be awesome I need to figure out what to do on my MJ.

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Last edited by muddypunk; October 26th, 2017 at 17:19.
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  #33  
Old October 26th, 2017, 20:51
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Re: Booster Upgrade

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Originally Posted by muddypunk View Post
That would be awesome I need to figure out what to do on my MJ.

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First I had to bend the pinch seam at the firewall up a little so it could fit the larger booster


Then I took the brake lines from the WJ master cylinder and had the fittings going to the proportion valve redone so they would fit my old valve.




The hardest part for me was the brake light switch though. I ground a little too much off the end of the wj pedal rod and that made the brake lights only come on when the pedal was about 70% of the way down (mines an 87 and I think the switch was changed in 90-91 to one that would have made this much easier). A lot of people say to grab the whole pedal assemboly from the WJ and swap that in too - which is what I will do next time. I ended up having to make a bracket that held the switch at the right angle and distance from the pedal arm.


I paid about $35 for the booster, master cylinder and the brake lines from pick and pull and $10 to have the fittings replaced at a local shop. Overall, I'd say it's worth it and i plan to do it again.

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  #34  
Old October 26th, 2017, 21:20
muddypunk muddypunk is offline
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Booster Upgrade

Sweet I have a new booster for my grand that was totaled in December. Thank you I'll be sure to grab the pedal and light assembly.

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  #35  
Old October 30th, 2017, 15:16
XJ firetruck XJ firetruck is offline
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Re: Booster Upgrade

mgracer, have you been able to get time to complete
the swap?
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  #36  
Old December 31st, 2018, 07:59
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Re: Booster Upgrade

Hello,
I have a completely stock '96 XJ. Brakes are completely new front and rear and being a '96 it does have the dual diaphragm booster. Pedal effort is at the upper end of what I would consider acceptable. Booster works, as I've experimented with coasting without engine vacuum and it does make a difference.

I know it's hard to quantify, but how are these pedals supposed to feel?

Thanks.
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  #37  
Old December 31st, 2018, 11:10
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cruiser54 cruiser54 is offline
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Re: Booster Upgrade

Did you adjust the rear shoes?
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  #38  
Old December 31st, 2018, 11:22
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Re: Booster Upgrade

Yes. Auto-adjusters are new, clean and lubed too.
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  #39  
Old December 31st, 2018, 11:25
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Re: Booster Upgrade

Google "bedding in brakes".
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  #40  
Old December 31st, 2018, 11:29
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Re: Booster Upgrade

Are XJs any different from most other vehicles when it comes to brake bleeding?

Pedal is firm. Jeep stops very well, just requires a a bit more effort than I would consider normal.

Thanks.
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  #41  
Old December 31st, 2018, 11:49
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Re: Booster Upgrade

Also, ABS does not work. Other than allowing the brakes to lock up, this wouldn't affect the brakes in other ways, right?
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  #42  
Old December 31st, 2018, 11:55
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Re: Booster Upgrade

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Originally Posted by Mikel View Post
Are XJs any different from most other vehicles when it comes to brake bleeding?

Pedal is firm. Jeep stops very well, just requires a a bit more effort than I would consider normal.

Thanks.
Bedding. Not bleeding.
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  #43  
Old December 31st, 2018, 12:22
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Re: Booster Upgrade

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Originally Posted by cruiser54 View Post
Bedding. Not bleeding.
Duh. I didn't follow any particular procedures, but after a brake job I try to take it easy for a few miles before I make any hard stops.

Both the front rotors and rear drums were almost new. I replaced the front pads with ceramic ones because of the huge amounts of brake dust the old pads were generating. There was no need to turn or replace the rotors.

In the rear, new shoes, cylinders, wheel bearings, seals, hardware...

Thanks.
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  #44  
Old December 31st, 2018, 12:26
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Re: Booster Upgrade

go bed them in.

https://brakeperformance.com/bedding-in-rotors.php
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  #45  
Old December 31st, 2018, 12:35
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Re: Booster Upgrade

Will do. Thanks.
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