Items Needed:

• Kelsey Hayes type master cylinder: L 1979-1983 Harley FX or 1980-1981 XL Sportster
• 3/16”x 1” flat stock approximately 4” long.
• 2 bolts 5/16”x 2 ½”
• 2 5/16”chrome acorn nuts
• 1 5/16” x 24 banjo bolt
• 1 5/16” solid rod (purchase at hardware store)
• 1 brake light switch for 67-79 Chevy Nova OEM# 1261219

Getting Started:

Remove banjo bolt from stock master cylinder and tie brake line up as high as possible with a zip tie. This will avoid too much air in the brake line.

Remove 2 Allen head bolts holding the floor board assembly, remove complete assembly and take to work bench.

Remove master cylinder and reservoir from floor board assembly.

Using a cut off wheel in a 4” or 4 ½” grinder, cut off the bolt on portion of the bracket (as indicated in the picture below.)



Grind the welds holding the stock brake light switch bracket. Be careful as you are going to need to weld this back on.

Take your 3/16”x 1” flat stock and hold it up to your new master cylinder to mark for holes and length.

Cut to length (approx. 3 ½”), drill holes with 21/64” bit, which is just slightly larger then 5/16”, this will allow you to mount and move slightly if your holes are not perfect.

Weld your new master cylinder bracket onto your pedal assembly. You want to keep the back hole of the new bracket in approximately the same place as the old one was.

Weld your brake light switch mount just below the curve in the steel of the pedal assembly, as shown in picture below.



(Hint) Use your new brake light switch in the mount before you weld to make sure that you will have it correctly positioned. Here is another picture of it completed to give you an idea of location. Do Not Weld Bracket with Switch attached!!!!



As you can see from the picture above, the brake light switch needs to be positioned so that the center button is pushed in when the pedal is at it’s normal upright position.

After welding, clean up everything, sand and paint black.

Take your 5/16” solid rod and place inside the master cylinder (as seen above). You are measuring the rod to mount just like the stock one. Make sure the pedal is all the way up and the bracket to which the rod connects is standing straight. Measure and mark, then cut to length. Next place the rod in a cordless drill. While you run the drill use a bench grinder and round out the tip. Once you have your shape, use finer sand paper and hold the sand paper in your hand and wrap around the tip and run the drill again to really smooth out the tip!



Using a ¼” x 20 die, cut an approximate 1-1 ¼” length of threads onto the other end of the push rod.



Remove master cylinder and install the rod into master cylinder and connect the other end to the bracket using a ¼” nut. Note! I had to grind the 2 sides of the ¼” nut in order to make it fit into the small bracket to which it attaches. Next mount the master cylinder back onto the pedal assembly. Adjust the rod to where there is no slack between pedal & master cylinder push rod and then tighten the outer nut down to the bracket.

Mount assembly onto the bike, but do not mount the brake line yet!!!

Fill the master cylinder with brake fluid.

Take one finger and place it over the master cylinder end where the brake line would hook up and keep pressure with your finger. Slowly push the pedal down but not all the way! Pump the pedal lightly till you feel some pressure. Let off and then just as you start to push the pedal pull your finger away and allow the fluid to escape. Before the pedal hits bottom put your finger back over the end and let off the brake pedal. Do this procedure a few times to make sure you don’t have any air.

Connect the brake line.

Now bleed the caliper in the same manner as the master. Push on the pedal as you open the bleeder and close before the pedal bottoms out. If you don’t get any air, your done!!!