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Rear master cylinder

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Old Sep 8, 2013 | 10:15 PM
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Default Rear master cylinder

Well was going to go for a ride today, thank goodness it was raining. Since it was raining like hell I decided to flush and bleed my brakes, because the rear has been a little mushy. Well come to find out the rear master cylinder is leaking. I am asking if it is recommended to rebuild the original MC or go for new? If new any recommendations and a link if you have one? 1977 FLH disc brakes.
Thanks
 
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Old Sep 9, 2013 | 08:18 AM
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From: la la land jerzey
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in my experence once it starts to leak the wear is in an oval fashion so putting round parts back in is no help -

just buy a new one BUT spend the money for one made in the usa the china $hit will only last a year like your toaster -- jz
 
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Old Sep 9, 2013 | 08:47 PM
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Thank you. I ordered on from the local shop here. Chandler Custom Cycles
 
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Old Sep 12, 2013 | 09:12 PM
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Ok I have the new master cylinder. Right now I have Dot 3 brake fluid. This MC calls for Dot 5. Flush the system with??? Any tips/tricks on the change?
Thanks
 
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Old Sep 13, 2013 | 12:13 AM
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I would disassemble and completely clean out the dot 3 before using dot 5. If you mix them it will turn into goo.
 
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Old Sep 14, 2013 | 07:55 PM
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I wouldn't under-estimate it when he says completely. Once I think it is totally flushed, I go back and do it again. And that's everything, master cylinder, caliper and fittings, brake line, seals. Everything.

After that you should be good to go for a long while with a trust worthy system. If there's one thing I like to be trustworthy it's my brakes.

When I changed from 3 to 5 I even changed brake lines just to be sure.
 

Last edited by RPBrant; Sep 15, 2013 at 03:56 AM. Reason: Typos
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