How do you seal brake line threads?

How to Seal Flare Fitting Connections

1. Unscrew the brake line from the fitting.
2. Clamp the appropriate-sized collet around the line.
3. Connect it to the Surseat lapping tool.
4. Spray some lubricant to the lapping head before using it.
5. Rotate the lapping head back and forth about 6-10 times.
6. Clean and inspect the flare.

Should you use Teflon tape on brake fittings?

You cannot safely, nor should you attempt to use Teflon tape on brake lines. A brake system should not rely on anything to stop a leak. The system relies on pushing a solvent under high pressure in a closed system for safe operation, and Teflon tape will threaten the integrity of that system.

How tight should brake line fittings be?

As a general rule from finger tight, continue tightening the nut until you feel it draw down tight, then tighten approximately 1/6″ turn more. Do not over-tighten.

What is the difference between double flare and bubble flare?

Just like the double flare, the bubble flare may also be called something else such as DIN or ISO. When creating a bubble flare, you have one less step. When someone is making a double flare, they actually start out by making a bubble flare before that.

How do you stop a flare fitting from leaking?

A leak will occur where the cone enters the flare. Loosen and tighten the flare nut several times to the torque specifications. This action will positively seat the cone into the flare. If the joint still leaks, dissemble the connection and wipe off the flare and the cone with a rag.

Does brake fluid affect PTFE tape?

Brake fluid dissolves teflon tape. Sealing the thread won’t help because that is not where the seal is. It is the flare. Either the line is deformed or the nipple inside the cylinder is (or its the wrong flare).

What type of flare is used mostly in the United States?

The most common type of flare you’ll find on domestic and street rod applications is a 45-degree double flare. The double flare is used on high pressure circuits like the brake and clutch system.

Can you over tighten a flare fitting?

Fourth, don’t over-tighten the flare fitting, as this can cause leaks. Daikin offers preset flare torque wrenches that will allow you to properly tighten the flare fitting without over-tightening them. Always use a backup wrench when tightening any flare fitting.