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Go Back JeepForum.com > Models > Jeep Wrangler Forums > JK Wrangler Technical Forum > Why the JK's BLD (brake locking differential) system kicks ***.

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Unread 12-17-2009, 06:53 PM   #1
DeepSky
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Why the JK's BLD (brake locking differential) system kicks ***.

Figured I'd share this video I compiled from my last off roading trip of myself and a few of my club members climbing a hill. Some things to note:
  • This hill doesn't look like anything in the video but it was very steep and pretty rutted out and uneven.
  • There are 4 of us including me that attempted this hill: 2 LJs, 1 TJ, and me.
  • The wife didn't video every attempt of the other Jeeps but on average each made 3 attempts to get up the hill.
  • None of our Jeeps have lockers.

I've always been a fan of the BLD system (minus the fact that it seems to cause crazy brake wear) but during this last trip I decided it really is the next best thing to lockers. Anyway here is the video:

http://www.deepskye.com/images/Jeep/BLD.wmv

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Unread 12-17-2009, 09:33 PM   #2
stick_it_
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Hahahah -JK rocks!!! Best Jeep ever!
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Unread 12-17-2009, 09:43 PM   #3
RockyClymer
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BLD - best and least talked about feature of the JK! Been using it for two years and keep up with the locked folks on all trails thus far. I don't think that there is that much additional brake wear IMO.
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Unread 12-17-2009, 09:44 PM   #4
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Nicely Done!

And this should be very interesting............
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Unread 12-17-2009, 09:54 PM   #5
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Very nice.

More often than not the guys bashing the JK's have never seen what they are capable of. Regardless of the likes or dislikes, proof again that the JK is just as capable as any other Jeep out there.
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Unread 12-17-2009, 10:41 PM   #6
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I Love it! Excellent!
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Unread 12-18-2009, 12:04 AM   #7
1222
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Very interesting. Thanks for sharing that.
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Unread 12-18-2009, 04:28 AM   #8
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A great showing for the JK! I'm curious though, does this BLD system work on our front wheels as well or just the rear?
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Unread 12-18-2009, 04:51 AM   #9
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Cool video! Thanks for sharing.
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Unread 12-18-2009, 04:55 AM   #10
ronjenx
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Quote:
Originally Posted by Voyame View Post
A great showing for the JK! I'm curious though, does this BLD system work on our front wheels as well or just the rear?
Yes.
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Unread 12-18-2009, 04:57 AM   #11
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slightly modified for accuracy...lol

Quote:
Originally Posted by McKBrew View Post
Regardless of the likes or dislikes, proof again that the JK is more just as capable than any other Jeep out there.
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Unread 12-18-2009, 05:00 AM   #12
Voyame
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One the one hand, nevermind my earlier question, found lots of answers on a search. I'd asked because recently we found ourselves in quite some muck climbing a wet hill (Aetna Mtn). I never did feel any of the brake system come into action but I may not have given it enough wheel spin speed to trigger it. I was in 4 lo the whole time and really only slowly turning the wheels. I decided to turn back, my buddies charged up the hill at speeds I wasn't willing to risk having seen 3 vehicles slam into the bank already. Still wondering if I should have given it more of an attempt.
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Unread 12-18-2009, 05:46 AM   #13
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They work most of the time but there are times that a locker makes life much easier.
Here are two little videos of me when I really really wished I had a locker.

Very steep hill with ledge on top at Beasley Knob:
[YT]<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/OWfFJZsODlo&hl=en_US&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/OWfFJZsODlo&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>[/YT]

Mud between the whoop-d-dooo's at Durhamtown Plantation:
[YT]<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/KS9AgwzBjCU&hl=en_US&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/KS9AgwzBjCU&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>[/YT]
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Unread 12-18-2009, 09:24 AM   #14
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Quote:
Originally Posted by Swagger View Post
Nicely Done!

And this should be very interesting............
haha thanks. I was thinking about posting this in the General or TJ section but I didn't want to rub it in their faces

Quote:
Originally Posted by Voyame View Post
I never did feel any of the brake system come into action but I may not have given it enough wheel spin speed to trigger it. I was in 4 lo the whole time and really only slowly turning the wheels. I decided to turn back, my buddies charged up the hill at speeds I wasn't willing to risk having seen 3 vehicles slam into the bank already.
Of all the moderately difficult hills we went up my buddies were the only ones giving it gas and using speed to get to the top. Everytime they'd do the obstacle first they would tell me "You're gonna have to give it some GAS" and then I'd crawl up it going grandma speed.

I've found that the BLD works the best (for me) with the following conditions:
  • You have 1 or 2 wheels not getting any meaningful traction.
  • You stay on the gas pedal at a consistent rate.
  • And you don't try to tackle stuff with speed. The system takes a second or two to kick in and the faster I seem to go the less effective it gets.
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Unread 12-18-2009, 09:47 AM   #15
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Quote:
Originally Posted by DeepSky View Post
I've found that the BLD works the best (for me) with the following conditions:
[*]You have 1 or 2 wheels not getting any meaningful traction.
They fail when all 4 lose traction and the system applies the brakes to all 4 wheels. Then you either slide back down your hill or just sit there and the Jeep shakes back and forth...
To be fair, this doesn't happen often. And I only crashed once as a result.
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