85 Power Booster Brake Upgrade... - JeepForum.com
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post #1 of 4 Old 08-27-2018, 08:54 AM Thread Starter
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1985 CJ7 
Join Date: Oct 2017
Posts: 30
85 Power Booster Brake Upgrade...

I used the unit from Pirate Jack, which appears very similar to all the units on Ebay, Amazon, Summit, etc….

I have the unit installed with the OEM lines (for now, will replace with new lines over the Winter), and yes the unit works, almost too well.

First, the push rod that attaches to the brake pedal has a large plastic bushing that is very sloppy and appears to be working its way out. Has anyone found a decent bushing or some sort of replacement for this?

Also the brake pedal rides very high now, something I can live with if everything else was perfect, but not there yet.

The biggest two issues has to do with brake pedal feel and the engine performance seems to be down now that I am running a vacuum line from the intake to the booster. 3rd gear used to pull hard and strong, and it just doesn’t feel the same. Also it seems to idle rough, and changes idle when I push and release the brake pedal. I am running around 500rpm for idle, should I bump this up?

The brake pedal feel is very hard and very sudden, not a lot of brake pedal movement before the brakes kick in, and they will all of a sudden.

Almost thinking of going back to the manual brakes and then mess with this more over Winter.

Anyone who has done this upgrade ran into similar issues and have any suggestions? TIA…..

Oh, one more thing…there are different pictures all over the place that show the firewall bracket mounte with the pivot point up, and some with the pivot point down…..Anyone able to verify which way this is?


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post #2 of 4 Old 08-27-2018, 09:01 AM Thread Starter
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post #3 of 4 Old 08-27-2018, 09:23 AM
Beer man
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1983 CJ7 
Join Date: Nov 2007
Location: Bakersfield, CA
Posts: 128
I just installed it this weekend and have yet to bleed the lines. I installed the bracket with the point down. I ran into the problem of the air cleaner touching the vacuum booster though. I ran a Howell TBI and K&N air cleaner.

1983 CJ7
Howell TBI
"I keep my top off because my feet stink"
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post #4 of 4 Old 08-27-2018, 09:58 AM Thread Starter
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Yeah if I flip my bracket, it may hit the throttle linkage on my MC2100.......but I cleared the air cleaner.
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