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bleed brakes, brake fluid, master cylinder

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  #1  
Old 20th February 2013
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Default Spurt in Rear Brake Master Cylinder?

In the HD workshop manual it states that when everything is working correctly, that a spurt will break the brake master cylinder DOT5 surface. Has anyone witnessed this to happen with the Rear Brake Master Cylinder?

I have followed all of the advice in the manual plus as I found in this forum, thank you all, but even with a firm pedal the brake fluid surface in the master cylinder remains undisturbed at all times! Am I looking for something that does not happen?
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Old 20th February 2013
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you can make it spurt.. Open the cover, and push down on the pedal, Then let the pedal come back quickly. usually will create a little bubble in the M/c
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Old 21st February 2013
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Thank you for confirming that the rear master cylinder can spurt when the brake is applied.

I have tried this many times, but there is no spurt and the bubbles stopped appearing before I achieved a firm pedal. The rear wheel is free to rotate and locks quickly with brake application, so other than no spurt it seems that everything is OK. On the front master cylinder it definitely spurts, its just that the rear stays like a mill pond.

I have now cleaned out the rear caliper, the brake line and fitted a rebuild kit to the master cylinder. The brake action feels sharper, but no spurt as defined by the HD manual. All suggestions will be investigated.
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Old 21st February 2013
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IF you got good brakes with no air in lines, don't worry about it spurting..

lots of girls can't spurt, even though they're supposed to be able to.. LMAO 11
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Old 22nd February 2013
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Quote:
Originally Posted by ReddTigger View Post
IF you got good brakes with no air in lines, don't worry about it spurting..

lots of girls can't spurt, even though they're supposed to be able to.. LMAO 11
Haha! Back to brakes, mine wouldn't because the piston wasn't going back all the way. I rebuilt it, spurts there now. It's a weak spring
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Old 22nd February 2013
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Another thing is that if the piston isn't going back all the way, your brake pedal will travel further down as the shoes wear thin because your not adding fluid to the pressure side of the piston your just pushing the same fluid back and fourth
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Old 22nd February 2013
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I've read that in the manual as well, but never bothered to check it. I just make sure there's fluid, put cap on, and bleed like my truck. I then might double check the fluid level.

I never really figured out what the "spurt" was supposed to signify. Brake orgasm?

John
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Old 22nd February 2013
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It's the little hole that feeds the pressure side of the piston being closed off. Not really like an orgasm but a prostate clenching, stopping pee.
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Old 23rd February 2013
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Thank you for the information and knowledge. I suspect many of us could do with a more detailed understanding of exactly how the master cylinder works.

I will now have to strip the rear master cylinder to find out why that new rebuild kit (Drag Specialties) is not operating correctly. Tested the original spring in with its original cylinder and piston on the bench and that operates fine dry, apart from the wear scoring where the plating has pealed of the piston.

I will report the outcome here in case it is of help to others.
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Old 23rd February 2013
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Stretching the spring out a little has helped me. I figured mine wasn't returning when I hooked up a mighty vac to bleed and got nothing coming out.
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