Hello.I have a problem with my rear brake. After 10-15 miles my rear wheel began to stuck.
I thought it was a master cylinder problem , but overhaul didn't help, so I overhauled GMA caliper and replaced rear rotor and after this installed another GMA used caliper and overhauled master cylinder again.The problem remains.
Today I installed original Harley caliper and the problem is the same- The brakes are not released..Master Cylinder builds pressure but caliper does not release the wheel after I stop pressing pedal.
Today I tried to use Master Cylinder from old Shovel and it did release the pressure ,so I decided that the problem is in Master Cylinder.
Is such a very difficult to find Master Cylinder 41755-83 for my motorcycle .I saw there Master Cylinder from an older Harley model has exactly the same shape and on aftermarket one they say it fits FLT 1982-early 1987, FX 1982-1985, FXR 1982-early 1987, FXST 1984-early 1987, FXWG 1983-1984, chrome-plated, piston Ø: 5/8” (15,8 mm), required brake fluid: DOT 5, replaces OEM 41755-83, 42470-82B, and 42446-82A
I found such at jpcycles website , but there it says it's not fits my bike and need your advice.
https://www.jpcycles.com/product/241...aster-cylinder
So need your advice
Am I right about my problem?
If I am right - does it fits my bike?
Thanks

 

Have you checked your rotor to see if it is still flat???

 

Air in the system will cause this, as the brakes heat up normally, the air will expand, putting more pressure on the brakes, causing them to heat up even more, causing more pressure, until the wheel want turn....
You may need to bleed the brake system.

 

The hose is probably collapsing. Replace the hose. I had the same issue on my 1985 flhtc

 

Yes.It is flat. I replaced

 

I bleeded few times

 

Original caliper was installed with new hoses

 

Remove the rear caliper again, keep everything else in place and try to push back the piston into the barrel. If you can't, loosen the hose at the master cylinder and try again. If you are able to push it back now, the piston in the master cylinder doesn't travel backwards enough to release the compensation hole in the master barrel.

 

Crimp in line or hose and very well could be what Daedalus mentioned

WP

 

If you open the bleeder will it release? Is the rotor properly aligned with the caliper? Have you ever mixed Dot4 & Dot5?
Brakes are not difficult, thoroughly clean or rebuild, and exercise pistons, check seals, bleed properly. and test. If it doesn't work repeat. If there is any indication of corrosion or contamination replace the parts in question.