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Brakes Rear center banjo bolt torque?

  • Thread starter Thread starter fox racer v2
  • Start date Start date Aug 3, 2021
F

fox racer v2

Active Member
Jun 2, 2019
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Brooklyn
Aug 3, 2021
#1
  • Aug 3, 2021
  • #1
Does anyone have the torque spec on the center rear banjo bolt for the J&M stainless lines?

I torqued mine down by hand, but after about ~500 miles it has a very slow leak. It shows up only if I hit the brakes with engine on, not off (need power assist I suppose). The leak does not show up immediately after use, but overnight there’s a bit of a puddle (after absorbing into cardboard, smaller than a coffee cup). Brakes don’t feel super soft soft or pedal to floor like a catastrophic failure but naturally concerned.

I torque to 20ft/lbs and notice it still occurs but less so (not quite half as much, but about half as much). The obvious answer is tighten it more, but I’d like a spec so I don’t snap the thing.
 
Last edited: Aug 3, 2021

foxbodybill89

Active Member
Jan 19, 2020
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Sioux Falls, SD
Aug 3, 2021
#2
  • Aug 3, 2021
  • #2
Little piece of dirt in there? Get a new crush washer, take it back off and make sure the sealing surface is clean with no burrs or pits. I have the same lines and tightened it down until it started to compress the copper washer. Should seal no problem without overtightening. I got a new banjo bolt off ebay for mine.
 
F

fox racer v2

Active Member
Jun 2, 2019
109
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Brooklyn
Aug 3, 2021
#3
  • Aug 3, 2021
  • #3
foxbodybill89 said:
Little piece of dirt in there? Get a new crush washer, take it back off and make sure the sealing surface is clean with no burrs or pits. I have the same lines and tightened it down until it started to compress the copper washer. Should seal no problem without overtightening. I got a new banjo bolt off ebay for mine.
Click to expand...
Thinking that’s my only option - LMR felt the same. Was hoping the spec was in the mid 20s and could be as simple as too loose. Worst case my “calibrated elbow” was out of spec.
All other banjos (front and rear) tightened to spec no problem. The rear center was the only one done by hand.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,248
17,929
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Massachusetts
Aug 3, 2021
#4
  • Aug 3, 2021
  • #4
I concur with that. New set of crush washers, inspect for any debris.

I tighten by hand and go As right as I can with my 6” rachet.
 

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
Aug 25, 2016
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polk county florida
Aug 3, 2021
#5
  • Aug 3, 2021
  • #5
Make sure you replace both washers, one on each side of the banjo fitting, make sure there are no washers stuck on the fitting or the bracket, I had similar problem and I left a washer on one side, two on one side = leak.
 

manicmechanic007

5 Year Member
Sep 26, 2017
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Roy, Utah
Aug 4, 2021
#6
  • Aug 4, 2021
  • #6
35 lbs is the spec for banjo bolts. If you use new washers 35 ft. lbs. is enough. If you are lazy or loose one it needs to be more like 45 to 50. The bolts are tough and break around 70.
 

manicmechanic007

5 Year Member
Sep 26, 2017
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Aug 4, 2021
#7
  • Aug 4, 2021
  • #7
I have never actually torqued a banjo bolt down with a torque wrench. I also tighten and worry
 
F

fox racer v2

Active Member
Jun 2, 2019
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Brooklyn
Aug 5, 2021
#8
  • Aug 5, 2021
  • #8
Thanks all - I’ll likely swap out the copper washers to be safe. Since I’ll have some downtime while that ships, I’m going to try torquing down a tick more just to scratch the inquisitive itch.
 
Last edited: Aug 5, 2021

mikestang63

SN Certified Technician
Aug 27, 2012
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In the garage
Aug 5, 2021
#9
  • Aug 5, 2021
  • #9
3 ugga duggas works for me usually
 
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