Help Me Diagnose My Brake Issue - 97 FZJ80 (9 Viewers)

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Jun 3, 2005
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Location
Centennial, CO
I've owned my 97 since 2008 and have always done my own brakes. I've never had issues with them I couldn't figure out until now, so I thought I would tap on folks who have been there and done that.

I have Powerstop rotors front and rear with OEM pads rear and 100 series pads up front. The rotors are still good, and both sets of pads have plenty of life left.

I have extended brake lines all around to accommodate my ICON/Slinky lift.

The brakes have been fine until late this spring. I went to drive it after it had sat for about a month and the brakes were barely stopping the truck. I have bled it several times now, in the proper order and there's no air in the lines and the brake feel is very stiff, yet it won't even muster enough stopping force to keep me from rolling down my barely inclined driveway.

I thought, well maybe there is still air in the lines, so I bled it again. I got good braking on a test drive, then went to drive it the next day and it's back to barely braking at all.

I'm not losing fluid anywhere and confirmed this through the reservoir.

I'm considering that it is the front brakes that have the issue as a reverse brake test works better than a front brake test. I'm thinking it is either one of the calipers sticking or maybe the brake master cylinder is going bad. Before doing more work, I want to see if any of you have run into this issue before.

Pic for attention.
2022-12-30 13.19.56.webp
 
Stiff pedal with poor braking is probably going to be the brake booster or the valve in the brake booster.
 
i doubt if your caliper pistons are leaking but they're easy enough to do a visual on. The rebuild kit from OEM is easy to work with and it's probably time anyway. I do have to wonder if your master cylinder isn't doing its job.
 
When I recently redid all my brake components,less booster, my front right caliper was seized. The feel was soft sinking pedal and a pull to the opposite side. Tightening the front wheel bearings and replacing all calipers, lines and master cylinder fixed the issue. Braking is now normal with no pulls or unexpected long pedal travel.
 
Stiff pedal with poor braking is probably going to be the brake booster or the valve in the brake booster.
I had not thought of the brake booster. I'll check that. Thanks for the suggestion.
 
When I recently redid all my brake components,less booster, my front right caliper was seized. The feel was soft sinking pedal and a pull to the opposite side. Tightening the front wheel bearings and replacing all calipers, lines and master cylinder fixed the issue. Braking is now normal with no pulls or unexpected long pedal travel.
I am hoping not to have to replace everything. I just checked the prices on OEM brake boosters and holy crap, over $600 with some almost $700!
 
I am hoping not to have to replace everything. I just checked the prices on OEM brake boosters and holy crap, over $600 with some almost $700!
folks are buying another quality brand of bb, can't think of the name at the moment.
 
folks are buying another quality brand of bb, can't think of the name at the moment.
It's not the Aisin or Bosch one, is it? I've been looking for those too.
 

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