Double Lap Flare

Single Lap VS Double Lap Flares:

Double lap flares are to be used for the rear brake pipe connection to rear wheel cylinders only. All other brake pipes will use ISO flares.
1. Obtain recommended tubing and steel fitting nuts of correct size. Outside diameter of tubing is used to specify size.
2. Cut tubing to length. Correct length may be determined by measuring old brake pipe using string and adding 3 mm (.125 inch) for each double flare.

Preparing For Double Lap Flare:

3. Cut end square and chamfer inside and outside diameter of tubing with de-burring tool. Remove all traces of lubricant from tubing.

NOTE: A double lap flaring tool must be used for steel brake pipes. Single flaring tools cannot produce a flare strong enough to hold the pressure in a brake system, leading to brake system failure.

4. Double lap flare tubing ends using J 23530.
a. Make sure fittings are installed before starting flare.
b. Unscrew compression screw until swivel cone is at its highest point. Swing strap to one side.
c. Open lever handle so it is at right angle to rest of tool and revolve hexagonal tube lights to accommodate tubing (selection of six sizes).
d. Be sure fitting nut is properly placed on tubing. Insert end of tube between two blocks until level with top of gage.
e. Insert proper pin of gage into tubing and swing strap back in closed position. Tighten compression screw until gage bottoms on tool, then unscrew compression screw and swing strap to one side. Remove gage.
f. Swing strap back in closed position, then tighten compression screw to flare cone downward to complete double lap flare.
g. Unscrew compression screw and open smaller lever handle to remove brake pipe.
h. Inspect flared ends for splits, cracks, pits or excessive out-of-round which may cause leaks.
i. Blow out brake pipe with dry compressed air to remove any foreign objects.
5. Bend new brake pipe to match old pipe using a tubing bender.

NOTE: Minimum clearance of 19 mm (.750 inch) must be maintained from all moving components and 13 mm (0.5 inch) from all vibrating components, unless brake pipe is clipped to the component. For armor wrapped pipe, contact is permissible if there is no relative movement between pipe and contact surface.