Question about 1993 Harley Davidson FXR Super Glide

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1993 FXR Rear Brakes

I want to adapt late model Harley OEM 4 spot calipers to my 1993 FXR. Can the existing stock master cylinder be used?

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  • terry_c_77 Jan 26, 2009

    Does anyone know the bore size on a rear OEM 4 spot caliper "master cylinder" ?

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If the Master Cylinder BORE size is the same as the bore size required for the caliper you want to replace it with, then YES, you can use your existing Master Cylinder.

Posted on Jan 26, 2009

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I am building a trike from a 1998 Harley Davidson FLSTC Heritage Classic. I want to make the front and rear brakes work on one master cylinder. My idea is to use the rear foot brake master cylinder wi


First, for this to work, you'll need a "proportioning valve" to adjust how much pressure goes to the front, and how much to the rear.

Also, you'll probably need a master cylinder with a larger bore than the stock on, to push more fluid.

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Rear brakes keep failing.


After reading your description, two ideas come to mind. If you have bench tested your master cylinder and it does not leak down. You have checked all fittings, lines, and master cylinder for leaks, and there are none. Then would suspect an issue with the rear brake caliper. You mentioned that you replaced the rear rotor due to it warping. I am curious to know why it warped? Raise the rear wheel off of the ground and spin the wheel. It should spin freely. Then apply and release the brake, to that wheel (a few times). After releasing the brakes, spin the wheel again. Does the wheel still spin freely? If it doesn't then I would check the brake pedal (see if it is releasing freely or binding), check the brake lines (see if there are and defects, flat spots, or kinks), and check the rear brake caliper (do all the cylinders retract with little resistance?) If the wheel does spin freely then I would check to see if you are using the correct type of brake fluid. Most bikes will require you to use DOT 4 or 5 brake fluid. If you substitute for a cheaper grade, it will affect the braking system. It may sound silly but I would double check that you are not accidentally resting you foot on the brake pedal. If that was happening, it would cause the brakes to fade. I hope that helps but If you have other details or question, let me know.

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Hi Bob, you need OEM part # 45072-87 repair kit and for more information about your issue, please visit the websites below, and for specific information or questions, please feel free to contact me at xlch@mail.com. Good luck and have a nice day.
Harley Davidson Parts Accessories
Harley Davidson Manuals Mark Workshop
HARLEY DAVIDSON FT MASTER CYLENDER REBUILD KIT INSTALL

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1 Answer

98 harley davidson rear brake assembly for a fat boy


The rear brake system consist of a rear brake master cylinder, a metal line that has a tee in it for the rear brake switch, a rubber brake hose and a rear caliper.

I'm not sure what you are wanting to know. The rear brake caliper is held into the rear caliper bracket by two bolts. Remove the bolts and the rear caliper will lift off of the caliper bracket. With the brake caliper off the bracket, notice the position of the pads and especially the stainless steel anti-rattle clips. When you replace the pads and clips, make sure you get them in correctly.

Now, you'll have to compress the piston back into the caliper. To do this use either a large pair of slip joint pliers or a large C-clamp. Use a rag or something to protect the paint on your caliper. Carefully slid the caliper back down over the pads while not disturbing them. Install the two bolts and torque them to 25 foot pounds.

You brake systems, both the front and the rear, take type DOT 5 brake fluid as best as I can remember. Harley has changed the type of brake fluid but I cannot keep up with the year model. It should tell you on the tops of the master cylinder.

Extreme care must be taken whenever working on brakes. Make sure they work properly. Failure to test the brakes for proper operation prior to riding the bike can result in sever injury or death.

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yes there is a recall on wings with the abs i can't find the recall sheet but the link here will tell you more
http://www.goldwingfacts.com/forums/forum1/917.html
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1 Answer

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As far as I know, Harley never put a hydraulic clutch on a FXR. This may be some sort of aftermarket unit. You may can find bleeding instructions on the Internet by doing a search for the name on the system.

If that doesn't work, you may have to "reverse bleed" the system. Using a syringe or oil squirt can with brake fluid in it, open the bleed valves at the slave cylinder and put fluid "up" to the master cylinder on the handlebar.

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1 Answer

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The most likely problem will be the rubber line coming from the splitter leading to the caliper. With age these get soft inside allowing fluid to pass one way easily but not the other. Remove this line and blow through it both ways to insure the fluid can pass both ways. If needed check the line from the master cylinder to the splitter as well.

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