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brakes

Just hit "search" and type in master cylinder. It will give you more than you can possibly read.

Other search terms could also be : e350 master cylinder, rear discs, F250 MC, MC upgrade

I personally have tried the following on my 1989 XJ single diaphragm booster:

E350, F250, F150. None worked as well as the stock one did.

My next plan is to do the 2001 WJ booster swap with master cylinder and prop valve (I also did the rear disc conversion already)
 
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Really depends on what brakes your running... so what brakes are you running?

I didn't switch to the E350 until I swapped in D44's with discs. My stock master worked just fine with WJ front calipers, and 8.8 rear drums.
 
I just put on the power slot roters and hawk pads put the pedal still go almost to the floor but the brakes feel firm. I don't think i would be able to lock up the brakes. 99 w/60,000 miles. 33's mtr's.
 
You need to find and fix the problem,I can lock-up my 33's with no problem and I use about an inch of pedal movement.
 
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