NBS Front Brake Swap for OBS Trucks

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Schurkey

Supporting Member
Supporting Member
Joined
Jan 14, 2018
Messages
11,230
Reaction score
14,208
Location
The Seasonally Frozen Wastelands
Thank you.

Downloads as a Word document, not a .pdf.

Seems to be several words missing--the text has multiple blank spots like certain words were removed.

Photos seem fine. Document has the lines numbered, which probably should have been turned off.
 
Last edited:

laxman21

Newbie
Joined
Nov 5, 2010
Messages
11
Reaction score
0
Anyone have the part numbers for the 14" brakes? I have 18" rims might as well go big!
 

vince72

I'm Awesome
Joined
Jul 13, 2023
Messages
227
Reaction score
267
Location
socal
Quick question: I have a OBS and would like to eventually perform this upgrade & also get a 2" drop spindle. Is there a company that sell a pre modified drop spindle with NBS brakes?
 

Helomedic1171

Newbie
Joined
Nov 2, 2013
Messages
26
Reaction score
20
Quick question: I have a OBS and would like to eventually perform this upgrade & also get a 2" drop spindle. Is there a company that sell a pre modified drop spindle with NBS brakes?
If you're talking about a 2wd, I don't think anyone does. Honestly, I don't think anyone sells pre-modified spindles for this swap at all.
 

Helomedic1171

Newbie
Joined
Nov 2, 2013
Messages
26
Reaction score
20
As an update to this thread - I can add some photos of my swap if that would be helpful. I also wrote down some party numbers of things I used like the brake line adapter and the stainless steel braided hoses.
 

Helomedic1171

Newbie
Joined
Nov 2, 2013
Messages
26
Reaction score
20
Here's my photos. In these photos, I still need to hang rotors and pads, but the swap is essentially done. I'll have completed photos later this week.

Notes:

I did NOT ream the bottom hole, I used new LCAs from a 2000 Chevy 2500 (GMT800). They are drop forged, come with the ball joint and bushings installed already, and as you can see, provide more clearance for installing CV axles both now and in the future.

I used a brake fitting as previously mentioned - AGC brand I think, part# BLF-22C. I just bent the existing hard line (blue) slightly to make room for the extra length of the fitting (green). I also used braided hoses (purple) - you don't have to; stock hoses would work as well.

The shock has to be modified - note the blue line I drew. A grinder works fine.

I don't have pics of reaming the upper ball joint hole - I recommend you get a cheap new ball joint or save one of your old ones if you're replacing them and use that as a guide for how far to ream and if you're straight. Being straight and plumb so that the castle nut is flat on the spindle is key - but very achievable with a drill, cutting oil, and some patience.

Otherwise, it's pretty straightforward - unbolt the parts you aren't using anymore, bolt in the new ones, and you're done. I used new because I needed lots of front end parts all at once. I needed a hub bearing, tie rods, and ball joints, so I did the swap while I was at it.

If you have specific questions, let me know.

*Edited for clarity
 

Attachments

  • PXL_20231022_222615461.jpg
    PXL_20231022_222615461.jpg
    258.8 KB · Views: 37
  • PXL_20231022_222638607.jpg
    PXL_20231022_222638607.jpg
    245.6 KB · Views: 35
  • PXL_20231022_222638607~2.jpg
    PXL_20231022_222638607~2.jpg
    266.8 KB · Views: 34
  • PXL_20231022_223105357.jpg
    PXL_20231022_223105357.jpg
    325.9 KB · Views: 36
  • PXL_20231022_223117507.jpg
    PXL_20231022_223117507.jpg
    269.6 KB · Views: 37
Last edited:

KansasOBS

I'm Awesome
Joined
Apr 29, 2023
Messages
168
Reaction score
344
Location
Kansas
Just did the brake lines on mine last night, is everybody just cross threading the BLF-22C adapter on? The threads on the GM fittings arent 3/8-24, theyre real close though. I dont know what they are, but they certainly arent the same as that fitting. I had to cut and flare the hard lines with new 3/8-24 fittings.

I didnt use the 2000 knuckles, so have to deal with the tie rod issue, but talked to the guys at Kryptonite, they will put together a set of tie rods with GMT400 inners, and GMT800 outers. I noticed their joints use the same threads on either side.
 

Schurkey

Supporting Member
Supporting Member
Joined
Jan 14, 2018
Messages
11,230
Reaction score
14,208
Location
The Seasonally Frozen Wastelands
I did NOT ream the bottom hole, I used new LCAs from a 2000 Chevy 2500.
Is this a GMT400 lower arm, or a GMT800 arm?

I don't have pics of reaming the bolt hole - I recommend you get a cheap new ball joint
"Bolt hole"? Do you mean the ball joint stud hole?

Otherwise, it's pretty straightforward - unbolt the parts you aren't using anymore, bolt in the new ones, and you're done.
How about the alignment?
 

Erik the Awful

Supporting Member
Supporting Member
Joined
Aug 9, 2019
Messages
7,891
Reaction score
16,287
Location
Choctaw, OK
Just did the brake lines on mine last night, is everybody just cross threading the BLF-22C adapter on? The threads on the GM fittings arent 3/8-24, theyre real close though. I dont know what they are, but they certainly arent the same as that fitting. I had to cut and flare the hard lines with new 3/8-24 fittings.
I hope not! It's brakes. Do it right.
 

Helomedic1171

Newbie
Joined
Nov 2, 2013
Messages
26
Reaction score
20
Is this a GMT400 lower arm, or a GMT800 arm?


"Bolt hole"? Do you mean the ball joint stud hole?


How about the alignment?

2000 Chevy 2500 (GMT800) arm

Yes, the Ball Joint hole. I reamed the top one only.

Thanks for pointing these out, I edited my post above.

I'll be going for an alignment next week once I finish the brakes and doing a rear wheel seal. I work long hours and only get weekends to work on it right now.
 
Last edited:
Top