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Old Apr 22, 2026 | 06:55 PM
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Default Thread Sealant Quick Question
About to put on the rear brake line including the fitting the stoplamp switch screws into. I do not trust this chrome fitting and stoplamp switch to not leak. I know I can put a small amount of tape on it, but I also have the Permatex Thread Sealant with PTFE. Seems it should work also. What says the forum? Tape (I will get the oil resistant tape and not use teflon) or the sealant?
 
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Old Apr 22, 2026 | 09:00 PM
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Either is fine for me.. Teflon tape is fine. It's fine for fuel, oil, brake fluid.
 
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Old Apr 23, 2026 | 06:54 AM
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I prefer paste, because it never breaks off inside. Just go easy on it.
 
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Old Apr 23, 2026 | 07:01 AM
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Thank-you gentlemen.
 
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Old Apr 23, 2026 | 07:25 AM
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I was using tape and get schooled by JohnZ to use paste. Works better and honestly easier to use. Teflon tape was not great for gasoline, not sure what brake fluid would do to it.
 
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Old Apr 23, 2026 | 08:11 AM
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Brake fluid destroys Teflon tape, possibly getting in the the system itself and wreaking havoc in there.
 
Last edited by MURPHCC1; Apr 23, 2026 at 08:13 AM.
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Old Apr 23, 2026 | 11:49 AM
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I'm a stickler when it comes to using the correct sealant for a specific job. In this case Permatex Pneumatic / Hydraulic Sealant is called for.
Amazon Amazon

 
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Old Apr 23, 2026 | 01:32 PM
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The back of the bottle for the permatex thread sealant also says used for hydraulic installations. It should be good also.
 
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Old Apr 23, 2026 | 02:39 PM
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Just a thought ... Hydraulic fluid and brake fluid are two different animals ??
 
Last edited by Uncle Larry; Apr 23, 2026 at 04:39 PM.
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Old Apr 23, 2026 | 02:51 PM
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I mean, they are essentially hydraulic brakes. DOT 5 is a silicon based hydraulic fluid which should be even easier on the sealant that petroleum based hydraulic fluid.
 
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