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Brake fluid as a Penetrating fluid #4806923
07/06/18 02:45 PM
07/06/18 02:45 PM
Joined: Aug 2016
Posts: 204
new jersey
jrvn Offline OP
jrvn  Offline OP
Joined: Aug 2016
Posts: 204
new jersey
can brake fluid be used as a penetrating fluid, to relieve rusted up broken studs. ive busted 3out of 4 m8x1.25 bolts that hold up my Toyota Tacomas skid pan and rather not drill and tap them out, I have access to the top of the broken stud and want to screw them right up and out but they are seized pretty good, also I have no access to heat torch. I was thinking of using a double nut jam or just use vise grips to tighten the shaft up and out. any good tips/tools appreciated. also ive used PB Blaster and a WD40 that really didn't penetrate the threads at all.

Last edited by jrvn; 07/06/18 02:46 PM.
Re: Brake fluid as a Penetrating fluid [Re: jrvn] #4806925
07/06/18 02:47 PM
07/06/18 02:47 PM
Joined: Dec 2016
Posts: 2,204
VA
maverickfhs Offline
maverickfhs  Offline
Joined: Dec 2016
Posts: 2,204
VA
Read a lot of people use ATF as a penetrating fluid.

Subscribing for brake fluid.


2006 Civic EX 202K/AT
2006 Acura TSX 180K/AT
Re: Brake fluid as a Penetrating fluid [Re: jrvn] #4806926
07/06/18 02:50 PM
07/06/18 02:50 PM
Joined: Dec 2006
Posts: 8,451
Illinois
mrsilv04 Offline
mrsilv04  Offline
Joined: Dec 2006
Posts: 8,451
Illinois
Brake Fluid tested as a penetrating fluid. Courtesy of Project Farm.

https://www.youtube.com/watch?v=st8dkGzJWtg


2004 Silverado - on its 3rd Jasper engine in less than one year.
Re: Brake fluid as a Penetrating fluid [Re: jrvn] #4806930
07/06/18 02:52 PM
07/06/18 02:52 PM
Joined: Mar 2010
Posts: 654
NY
mx5miata Offline
mx5miata  Offline
Joined: Mar 2010
Posts: 654
NY
I heard transmish fluid and acetone


NAPA FULL SYNTHETIC 0w20 Partsplus oil filter
Wix air filter
Re: Brake fluid as a Penetrating fluid [Re: jrvn] #4806933
07/06/18 02:55 PM
07/06/18 02:55 PM
Joined: Oct 2017
Posts: 6
south charleston wv
fordmanwv Offline
fordmanwv  Offline
Joined: Oct 2017
Posts: 6
south charleston wv
yes my grandfather used brake fluid as penetrating oil. Use new fluid put it on and let it set overnight or longer.

Re: Brake fluid as a Penetrating fluid [Re: mrsilv04] #4806935
07/06/18 02:57 PM
07/06/18 02:57 PM
Joined: Aug 2016
Posts: 204
new jersey
jrvn Offline OP
jrvn  Offline OP
Joined: Aug 2016
Posts: 204
new jersey
Originally Posted By: mrsilv04
Brake Fluid tested as a penetrating fluid. Courtesy of Project Farm.

https://www.youtube.com/watch?v=st8dkGzJWtg
this is the video I watched, it seems the brake fluid had penetrated very well down the threaded shaft compared to generic penetrant fluids

Last edited by jrvn; 07/06/18 02:57 PM.
Re: Brake fluid as a Penetrating fluid [Re: fordmanwv] #4806938
07/06/18 03:01 PM
07/06/18 03:01 PM
Joined: Aug 2016
Posts: 204
new jersey
jrvn Offline OP
jrvn  Offline OP
Joined: Aug 2016
Posts: 204
new jersey
Originally Posted By: fordmanwv
yes my grandfather used brake fluid as penetrating oil. Use new fluid put it on and let it set overnight or longer.
I had new front struts put on my truck and basically all 4 bolts were seized/rusted even after soaking PB Blaster for days all the bolts I broke threads were dry as a bone. I actually used a toothbrush to scrub the remaining broken studs with brake fluid hopefully it does better than PB Blaster did

Re: Brake fluid as a Penetrating fluid [Re: jrvn] #4806950
07/06/18 03:24 PM
07/06/18 03:24 PM
Joined: Nov 2013
Posts: 1,950
Chicago, IL
EdwardC Offline
EdwardC  Offline
Joined: Nov 2013
Posts: 1,950
Chicago, IL
I know you said that you don't have access to a torch, but I'd still recommend that route. A small propane torch is pretty inexpensive and can make a huge difference in getting a frozen bolt loose. Even a small butane torch like you'd use for lighting cigars and such could be used (might not work well if it's not quite designed to be held on for long periods of time).

Plus, there are lots of different uses for a torch!

Re: Brake fluid as a Penetrating fluid [Re: EdwardC] #4806970
07/06/18 03:54 PM
07/06/18 03:54 PM
Joined: Nov 2006
Posts: 20,590
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,590
MA, Mittelfranken.de
Mapp gas gets pretty hot and with Oxy works good for rusted fasteners and brazing, its not a full on smoke wrench but for occasional home use its really okay.

https://www.amazon.com/Bernzomatic-BZMOX...YQMGRKTS54WPH2C


ASE L1, Master. Deutsch Meisterbrief.
Re: Brake fluid as a Penetrating fluid [Re: jrvn] #4806981
07/06/18 04:14 PM
07/06/18 04:14 PM
Joined: Nov 2013
Posts: 1,156
UT
BHopkins Offline
BHopkins  Offline
Joined: Nov 2013
Posts: 1,156
UT
While brake fluid may be effective as a rust penetrating fluid, it is also very corrosive, and using it will lead to worse corrosion later on. Project Farm did a follow-up to the video above. The results should not be too surprising to most.

https://www.youtube.com/watch?v=UoijjWUGU2Q


2013 Subaru Outback 2.5i - Idemitsu 0W-20 & Mobil 1 filter
2007 Mercedes SL550 - M1M 5W-40 & MB OEM filter
Re: Brake fluid as a Penetrating fluid [Re: jrvn] #4806994
07/06/18 04:23 PM
07/06/18 04:23 PM
Joined: Aug 2017
Posts: 565
Nebraska
BJD78 Offline
BJD78  Offline
Joined: Aug 2017
Posts: 565
Nebraska
Penetrating oil often takes several days or even a couple of weeks to really penetrate in and do it's work. A good dose of patience is often required. I recently changed the rear and front diff fluid of our 2010 Forester and had quite a time with the front diff drain plug, it was frozen and rusted in pretty good and I did not want to use a cheater bar and round out the torx drain plug. Since the threads point upward and gravity was doing it no favors, I sprayed it really good about every other day or 2 with WD40 and when that ran out I had a can of Johnson penetrating oil, finally after about 3-4 weeks of keeping it sprayed down good, I was able to remove it fairly easily without a cheater bar and without damaging the torx. Not sure about brake fluid, but my grandfather used to use nail polish remover (acetone) along with trans fluid and it worked about as good as liquid wrench or WD40, but still took time to penetrate. Any penetrating oil is certainly going to work better and faster if the head of the bolt/ screw or plug is pointing downward, vs upward or horizontal.


2010 Forester:122K
2009 Sonata :189K
2010 Tucson:55K

OCI 5K using the cheapest dino oil I can buy,usually NAPA or TSC Travelers oil.
Re: Brake fluid as a Penetrating fluid [Re: jrvn] #4807025
07/06/18 04:49 PM
07/06/18 04:49 PM
Joined: Aug 2003
Posts: 13,141
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 13,141
NE,Ohio
brake fluid also melts your paint off.. I'll pass.


2019 Jeep Cherokee Trailhawk 2.0T
Re: Brake fluid as a Penetrating fluid [Re: jrvn] #4807095
07/06/18 06:47 PM
07/06/18 06:47 PM
Joined: Apr 2012
Posts: 5,594
MA
Wolf359 Offline
Wolf359  Offline
Joined: Apr 2012
Posts: 5,594
MA
I like Kroil myself. You can get 2 cans directly from them for $14 plus shipping. I think Amazon charges $17 if you have a big enough order to get free shipping.

https://websecure.cnchost.com/kanolabs.com/orders/order_kroil.shtml

Re: Brake fluid as a Penetrating fluid [Re: Wolf359] #4807233
07/06/18 09:25 PM
07/06/18 09:25 PM
Joined: Jan 2007
Posts: 2,576
Oneida County, NY
rsylvstr Offline
rsylvstr  Offline
Joined: Jan 2007
Posts: 2,576
Oneida County, NY
Originally Posted By: Wolf359
I like Kroil myself. You can get 2 cans directly from them for $14 plus shipping. I think Amazon charges $17 if you have a big enough order to get free shipping.

https://websecure.cnchost.com/kanolabs.com/orders/order_kroil.shtml


Same here. Aerokroil is amazing IMO


2013 F150 SCrew Lariat 4X4 5.0 3.55
2012 Altima SL that still vibrates.
2018 Polaris Sportsman 850 SP. Polaris fluids and filter.
Re: Brake fluid as a Penetrating fluid [Re: jrvn] #4807267
07/06/18 09:59 PM
07/06/18 09:59 PM
Joined: May 2012
Posts: 1,839
The land of USA-made Subies!
SubieRubyRoo Offline
SubieRubyRoo  Offline
Joined: May 2012
Posts: 1,839
The land of USA-made Subies!
Another vote for Aerokroil. If you buy a quart of Kreen, you can get a free can of AeroKroil. Not sure if the moneyback guarantee covers the free spray can, but I just bought my third quart of Kreen. smile

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