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Old 08-26-2014, 10:27 PM
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Anyone have an idea why someone would do this?

1991 YJ Wrangler

These notches appear to have been cut into the steering knuckles by PO on both sides. Not sure why?
Discovered these while trying to find out why scraping scratching noise coming from front brakes, seems like the pads stay against rotor after braking. Already replaced MC, rotors, pads, and calipers. Brake lines were also changed to braid during lift kit install.

Any ideas?

Thanks in advance,
WC
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Old 08-27-2014, 07:46 AM
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Aren't those the notches that the pads fit into when you're putting the calipers on?

Or am I looking at the wrong part?
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Old 08-27-2014, 07:53 AM
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Re: Anyone have an idea why someone would do this?

Well that's what I thought at first but they appear to be handcut and when compared to other steering knuckles (other yj,wj,zj) they are not present. I just figured someone might have seen somewhere that this was some kind of work around for some other problem we will discover after replacing the knuckles.
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Old 08-27-2014, 09:43 AM
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Quote:
Originally Posted by Wildcard View Post
Well that's what I thought at first but they appear to be handcut and when compared to other steering knuckles (other yj,wj,zj) they are not present. I just figured someone might have seen somewhere that this was some kind of work around for some other problem we will discover after replacing the knuckles.
My TJ has them and both my ZJs do, although you're right, they appear a little bit deeper/wider cut.
I suppose it's possible that the pad backs themselves wore it out if the rotor was warped or something, but that's purely speculation on my part.
Not the best pic as I didn't want to take my brakes apart or my wheels off just this minute, but you can kind of see the groove on my TJ's-


ForumRunner_20140827_104137.jpg

I'd say try it out on an empty street or parking lot, or find a brake shop that does free estimates
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Old 08-27-2014, 09:44 AM
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Ok apparently my phone didn't want to select the right pic

Nevermind, it is the right one, but it's sideways lol
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Old 08-27-2014, 05:59 PM
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Re: Anyone have an idea why someone would do this?

Quote:
Originally Posted by Wildcard View Post
1991 YJ Wrangler

These notches appear to have been cut into the steering knuckles by PO on both sides. Not sure why?
Discovered these while trying to find out why scraping scratching noise coming from front brakes, seems like the pads stay against rotor after braking. Already replaced MC, rotors, pads, and calipers. Brake lines were also changed to braid during lift kit install.

Any ideas?

Thanks in advance,
WC
Hmm, typically the rotor will wobble just a teeny bit, and that will push the pads away by just a tad so they don't rub.

Those notches look like they are there to keep the pad metal holder from clunking into the caliper... if you have any buddies at a brake shop, ask them. I recall the ZJ had similar notches but don't have pics or FSM.

Do you hear the rubbing with the wheels up in the air, wheels off, turn by hand?

If you very gently push the pads back do they move?
Or is something holding pressure from the master cylinder on them such that they cannot retract?
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Old 08-27-2014, 10:13 PM
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Re: Anyone have an idea why someone would do this?

OK so if the wheel is off the ground it can spin freely until you hit the brakes, then it rubs. Yes you can push the pads back easily without cracking the bleeder or anything like that. The thought is that the notches keep the pads from sliding nicely away. When I look at replacement knuckles they do not appear to have the notches. It's possible the PO sourced these from the scrapyard. I do think it IS possible that the elongation of the notches COULD be from pad rub, but the knuckle looks to be cast iron...that's a lot of rubbing.
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