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Author Topic: Front Brakes  (Read 1487 times)

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Offline Staz

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Front Brakes
« on: April 12, 2011, 07:32:55 PM »
Hi everyone. I am looking for front brakes for my 350f. The ones I have are one time use then they lock up/freeze. I have flushed the system a few times, there's no clogs in the lines. The piston just seems to get stuck because it wants to. I got it unstuck, pulled it out and cleaned it and put it back together and it does the same repeatedly. So I feel like replacing it entirely; I don't really want to mess with it any more right now. This is just a thought that has popped in my head right now, could it be something to do with the master cylinder up on the bars?  Any ways to fix the sticking problem? Also where can I buy parts for my brakes, ebay only had the pads when I looked yesterday.
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Offline ddanz27

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Re: Front Brakes
« Reply #1 on: April 12, 2011, 10:16:19 PM »
Hey Staz! I just rebuilt my front brakes from the ground up. Heres a little check list for you if you want to have some really up to date performance from your brakes...

Master cylinder rebuild kit. I would suggest OEM, just peace of mind IMO
Stainless lines. I got mine from slingshot cycles along with new banjo bolts
Lead brake line. Got an OEM one off of Ebay for about 12 dollars
Caliper piston seal. OEM
New phenolic piston from Kevin400f a member on here. Your piston may be serviceable but I figured why not start with a clean slate.
I also went with a new speedbleeder and man I am just good to go now. It works like a charm. If you do all of this it will set you back about 180 dollars including replacing some nuts and bolts here and there and then your fluids and stuff. Good luck with your project. Take your time and do it right. Try and be as surgical as possible with hydrolic brakes.
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1974 Honda CB350F

Offline westondc

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Re: Front Brakes
« Reply #2 on: April 12, 2011, 11:15:07 PM »
sombody correct me if i'm wrong, but i think you might need to grease the brake piston when putting it back in. this would keep it from stickin
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Offline Kevin400F

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Re: Front Brakes
« Reply #3 on: April 13, 2011, 01:02:25 AM »
The lockup could be the result of the small "bleed hole" in the floor of the master cylinder reservoir being plugged.  There are two holes, the smaller of the two, closest to the outlet/hose connection, is the one that can cause a lockup issue.  It is quite tiny...you may have to use something like a high e electric guitar string to bore through it.

Kevin
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Offline Lars

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Re: Front Brakes
« Reply #4 on: April 13, 2011, 04:23:16 AM »
The square piston seal is twisted as you brake. When you release the lever, the elasticity of the twisted seal will force back the piston. An old stiff seal does not work very well. Of course, everything else has to be clean and no major rustpits on the side of the piston. Before installing the piston, simply give the piston sides a layer of brake fluid.

+1 on Kevins comment on the tiny hole in the master cylinder, a hair from a clean steelbrush works fine, too.

Steel houses is not a must, but old eubber becomes soft and absorbes some of the brake force. A new pair of rubber houses works fine.

Good luck.
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KingCustomCycles.com

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Re: Front Brakes
« Reply #5 on: April 13, 2011, 04:44:32 AM »
Most commonly, the groove the caliper piston seal is inserted into has corrosion build-up behind the seal.  This binds the piston.
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Offline Staz

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Re: Front Brakes
« Reply #6 on: April 13, 2011, 02:28:09 PM »
Quote from: Kevin400F on April 13, 2011, 01:02:25 AM
The lockup could be the result of the small "bleed hole" in the floor of the master cylinder reservoir being plugged.  There are two holes, the smaller of the two, closest to the outlet/hose connection, is the one that can cause a lockup issue.  It is quite tiny...you may have to use something like a high e electric guitar string to bore through it.

Kevin

Thanks everyone, and I'll try this Kevin, I have plenty high e guitar strings cause they are most prone to breaking when I play lol. I'll root for a used one.  I think that actually is the problem and this is kinda what I meant by the master cylinder being part of the problem, a clog somewhere in it I didn't see. I'll also take a closer look to see if my caliper piston is corroded before I put my brakes back on. New hoses are going on too once I get the money for everything, My bike needs all of these little things here and there and the price is adding up quick and not having a job makes it a little difficult. And I read that you can get me a new piston Kevin? Do you make them, I'm wondering because I am a machinist and I think I could make it and if you do make them could I have some feedback if I try to make one?
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