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.

Sep 14, 2014 | Motorcycles

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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.

Feb 28, 2014 | 2001 Harley Davidson FLHTCUI Electra Glide...

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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 Good luck and have a nice day.
Harley Davidson Parts Accessories
Harley Davidson Manuals Mark Workshop

May 17, 2012 | Motorcycles

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.

Apr 09, 2010 | 2000 Harley Davidson FLSTF Fat boy

1 Answer

Cant bleed the hydrolic clutch on my fxr

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.

Mar 24, 2010 | 1993 Harley Davidson FXR Super Glide

1 Answer

Rear brakes lock up

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.

Apr 19, 2009 | 1993 Harley Davidson FXR Super Glide

2 Answers

Ford 1993 f350 42010.7 miles

Hello 1HVAC: thank you for choosing

Are the brakes going to the floor? Is the resovoir staying full? It's a good possibility that the master cylinder is not funtioning properly, however, before replacing that, check the back brakes - check the drums for a groove, and have them checked for possible re-surfaced. There is a groove depth maximum for being re-surfaced - have them both checked. If they can be, have the drums resurfaced, (change pads and shoes in rear if needed;if not already done).

I bought an 86 Ford F150 a few years back, and when I got up to 35mph, it would do that, especially when I applied the brakes. I had the brakes all around replaced, as well as the master cylinder, and the problem was solved. I suggest having the drums checked first (can be done at some auto parts stores with a G caliper <--I think that's what they call it- either way they can check the depth of any grooves that are caused (normal wear) from the the brakes (rear). If they can be resurfaced, do so, (or if preferred buy new ones- can be spendy though) and if the brakes need replaced, do that as well. If you have never done rear brakes on this type of truck (or at all; for rear) it is actually quite simple. A service manual can show you how to do this, in a step by step process. I prefer, and recommend a CHITONS, as it is more descriptive. If the problem still exists after these procedures, then the only thing left really is the master cylinder. It may just be leaking somewhere (have all brake lines checked thoroughly) as well as the resovoir and connections to the master cylinder.

I hope this information deems useful and helpful. I hope I have been a posotive assistance in the success in the successful repair of your braking system. Thank you again for choosing


Apr 06, 2009 | 1993 Ford F350

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