Question about Porter Cable Cable BN125A Factory - Reconditioned 18 Ga., 1 1/4" Brad Nailer Kit

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Porter Cable BN125A air escaping full pressure thru the top exhaust

After firing the first brad, air escapes full pressure thru the top exhaust

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Needs oiled regularly

Posted on May 05, 2014

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Posted on Jan 02, 2017

rowdy45176
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SOURCE: air is escaping from the top of the bn125a brad

it sounds like you have a damaged o ring/seal that requires maintenance. You can go to Dewaltservicenet.com and download a breakdown for this tool and also order parts for it. When reinstalling new o rings don't forget to put a little bit of grease on them so they don't roll or pinch. Let me know if you need more help

Posted on Nov 15, 2009

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1 Answer

When i connect the air it sounds like all the air is escaping.


depends on where air is escaping from. If it is around the trigger then you need a new trigger valve (I have detailed instructions in the tip section on repair) If it is leaking thru the cap you have a pinch o ring or stuck firing valve. Let me know exactly where air is leaking and I will try to pinpoint the problem for you.

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The gun constantly exhausts air when connected to air compressor. Won't build up the pressure when connected. Must disconnect between firing trigger


Easy fix if air is leaking out the top of gun. Remove the head and lube with white grease or silicone paste. If orings seem to be loose, order repair kit from dewalt (you can tighten orings by removing the oring and wind a bit of teflon tape in the oring groove). If air is leaking from the trigger, replace the valve. If air is leaking out the bottom where the nail ejects, pull out the cylinger and lube the orings that seal the cylinder to the body of the gun.

Oct 19, 2011 | Dewalt Heavy - Duty 18 Gauge 2" Brad...

1 Answer

I have a Craftsman brad nailer. Today it started discharging the exhaust air slowly after each fire. It's like it "hisses" for 4 or 5 seconds before it's ready to fire again. It used...


Over time grit /debris enters the gun thru the hose. Remove the head and clean orings and the surface that they contact. Remove fine scratches with 400 paper. Apply silicone paste lube to orings and surfaces (silicone paste is sold at Lowes in plumbing department and swimming pool supplies area). Should be ready to work. Good luck with your repair.

May 12, 2011 | Sears Air Tools & Compressors

1 Answer

SLP 20 Leaks air from top and I Just replaced the chamber and o Rings.


The slp20 uses a firing valve part # ba0119 black plastic w/rubber boots. This valve is what prevents air from leaking thru top of gun. If pin hole has developed, or oring # lb0012 is not in place under the firing valve or if the retainer # bf0149 does not fit snugly on cylinder or has cracks, the gun will leak. Assuming oring is in place and retainer is good, suspect firing valve. Good luck

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1 Answer

I have three nailers from CH and all of them sound like there is not enough pressure to fire the nail when i depress the trigger. i hear air escape, but it is at a reduced level compared to normal...


Check and adjust the air pressure at the compressor. All air tools have a recommended range of pressure, and you may not have enough air for the tool to work. Also, place two drops of pneumatic oil or light machine oil into the air inlet at the nailer, and then connect the hose. Fire the gun several times into scrap wood. Oil with 2 drops daily.
Best regards, --W/D--

Mar 06, 2011 | Campbell Hausfeld Air Brad...

1 Answer

Bn125a nailer not sinking nails all the way


The depth to which a fastener is driven is controlled by the depth adjustment

knob (A) Fig. 19 below. The depth of drive is factory adjusted to a nomimal setting.

Test fire a fastener and check depth. If

a change is desired, rotate the

adjustment knob (A) Fig. 19: the

adjustment knob has detents every 1/4

turn. Rotate the knob clockwise (see

Fig. 19), to increase the depth of drive,

rotate the knob counterclockwise to

decrease the depth of drive. Test fire

another fastener and check depth.

Repeat as necessary to achieve

desired results. The amount of air pressure required will vary depending on the

size of the fastener and the material being fastened. Experiment with the air

pressure setting to determine the lowest setting that will consistently perform

the job at hand. Air pressure in excess of that required can cause premature
wear and/or damage to the tool.


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Good Luck

Nov 26, 2010 | Porter Cable Cable BN125A Factory -...

1 Answer

How do I adjust the depth of the brad nail on the porter cable BN 125A brad nailer


Hello. To adjust the depth of the nail you have to increase or decrease the air pressure from the compressor. Look at the compressor and you will see a knob or dial that you can turn to increase or decrease the air pressure. Do this adjustment in small increments testing the nailer by driving nails into a scrap of the same material you will be driving the nails into on the actual job. Increasing the pressure will drive the nail deeper and decreasing the pressure will drive the nail less deep. Joe

Nov 10, 2010 | Porter Cable Cable BN125A Factory -...

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