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07 civic LX coupe, rear wheel cylinder leaks

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Old May 4, 2022
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07 civic LX coupe, rear wheel cylinder leaks

Hello All. Need some help on the tightening torque settings on the rear drum wheel brake cylinders. The bleeders I found out are 5FTLB.
I am looking for the torque on the hard flare line that is a 3/16" OD line and the flare nut is 10mm.

At 10FTlb , it still seeps very slightly when the brake pedal is applied continually. The new cylinder is a HONDA OEM from a local dealer.
Have not replaced the hard line as of yet.
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Old May 4, 2022
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Re: 07 civic LX coupe, rear wheel cylinder leaks

Where did you get 10 ft/lb from?
no idea what the spec is but that fitting needs to be alot tighter than that. Put the torque wrench down and get a set of line wrenches. Never seen anyone use a torque wrench on a brake line before.
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Old May 5, 2022
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Re: 07 civic LX coupe, rear wheel cylinder leaks

Thank you for your reply. I found the Honda service manual and the line is 11FTLB, and 5 on the bleeder.
I have been trying to resolve this for several weeks and discovered that if I torque it pass 11 to around 13.5, it will leak more. At 10-11, it leaks the least. I have just replaced the hard line and the Cylinder with HOnda OE replacements but the leakage continues with no improvement. Just as a reminder, to test, the brake pedal is applied while the engine is running, braced in the depressed position and then engine off. I have it continually it this state for testing. The leak is very slow, but in about 4 hours, there is enough leak to wet a finger tip. If the brake pedal is not pressed , it does not leak.
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Old May 5, 2022
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Re: 07 civic LX coupe, rear wheel cylinder leaks

Defect in the end of the line or the wheel cylinder fitting? Still think that torque spec is too low/unnecessary
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Old May 5, 2022
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Re: 07 civic LX coupe, rear wheel cylinder leaks

Originally Posted by Colin42
Defect in the end of the line or the wheel cylinder fitting? Still think that torque spec is too low/unnecessary
I agree it seems too low for a 10mm flare to 3/16”. I tightened to 13 and it is a much slower leak now. I looked up on various torque reference tables for this size flare and it list 16 dry.





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Old May 5, 2022
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Re: 07 civic LX coupe, rear wheel cylinder leaks

Try 25ft/lbs if you're going to keep using the torque wrench. Otherwise just snug it down with a line wrench until it stops leaking
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Old May 5, 2022
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Re: 07 civic LX coupe, rear wheel cylinder leaks

Good idea, I will do that in small increments. Thank you for your assistance.

Last edited by edwardwoo; May 5, 2022 at 09:21 PM. Reason: hit send too soon.
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