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Old 03-26-2008, 08:39 AM   #1
99eight
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Question for the mechanics out there...

What's the most likely source of air making its way into my brakes?

I have new brake fluid and stainless steel brake lines. I'm having to bleed them every track day. Not sure if you guys have noticed, but my brother is on my these days and I can't be having mushy brakes trying to fend him off!
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Old 03-26-2008, 08:44 AM   #2
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Quote:
Originally Posted by 99eight View Post
What's the most likely source of air making its way into my brakes?

I have new brake fluid and stainless steel brake lines. I'm having to bleed them every track day. Not sure if you guys have noticed, but my brother is on my these days and I can't be having mushy brakes trying to fend him off!
I am going to play doug just for a second...maybe your bor is on your because he is riding a honda? (sorry I couldn't resist)

I would say probably in the connections to master cylinder or at the caliper. But I am sure you inspected those.

Also are you dead sure you got all the air out when you bleed them?
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Old 03-26-2008, 08:45 AM   #3
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I'm not a mechanic, but I would say either a hole in the line, or not a good seal at the reservoir. just my .2
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Old 03-26-2008, 08:48 AM   #4
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What kind of lines? Maybe the crimps aren't good.
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Old 03-26-2008, 08:50 AM   #5
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What kind of lines? Maybe the crimps aren't good.
Crimps that is the word I was looking for not connections. :/:
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Old 03-26-2008, 08:52 AM   #6
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You could be boiling the fluid if you are only riding it on the track. That would cause the need to bleed them. You would need to find a higher temp fluid.
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Old 03-26-2008, 08:54 AM   #7
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I forgot to ask what type of fluid.
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Old 03-26-2008, 09:06 AM   #8
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MT600

Motul RBF 600 Specifications:
DOT Rating - 4
Dry Boiling Point - 594°F
Wet Boiling Point - 421°F
Compatible with other fluids - Yes
Container - 16.9 fluid ounce (500ml) plastic bottles, factory filled with nitrogen to preserve freshness


^^^^ that's good chit right there.

i'm gonna have to go with bdmpastx's theory. sounds like your fluid might be boiling up. what kind of fluid are you using?
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Old 03-26-2008, 09:08 AM   #9
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Quote:
Originally Posted by houseofpain View Post
MT600

Motul RBF 600 Specifications:
DOT Rating - 4
Dry Boiling Point - 594F
Wet Boiling Point - 421F
Compatible with other fluids - Yes
Container - 16.9 fluid ounce (500ml) plastic bottles, factory filled with nitrogen to preserve freshness


^^^^ that's good chit right there.

i'm gonna have to go with bdmpastx's theory. sounds like your fluid might be boiling up. what kind of fluid are you using?
That's the one!
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Old 03-26-2008, 09:29 AM   #10
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You probably need a new master cylinder
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Old 03-26-2008, 09:31 AM   #11
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You just need a good mechanic.
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Old 03-26-2008, 09:32 AM   #12
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You probably need a new master cylinder
+1
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Old 03-26-2008, 09:33 AM   #13
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You just need a good mechanic.
Well that is you. What do you think it is? Also you going to universal today?
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Old 03-26-2008, 09:42 AM   #14
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Well that is you. What do you think it is? Also you going to universal today?
I think I would re-seal the master cylinder (just to get that out of the equation), change the fluid and bleed it, and do the overnight zip tie trick, see how that worked and go from there.

No - it ain't looking good for the Universal rides - Simulator @ 1 again today - don't get our of training till about 9pm this evening.
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Old 03-26-2008, 10:04 AM   #15
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Quote:
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I think I would re-seal the master cylinder (just to get that out of the equation), change the fluid and bleed it, and do the overnight zip tie trick, see how that worked and go from there.
When you say reseal it are you talking about the lid o ring? Also what is the overnight zip tie trick?

Quote:
No - it ain't looking good for the Universal rides - Simulator @ 1 again today - don't get our of training till about 9pm this evening.
Dang, they are putting you through the ringer. If it makes you feel any better, I will feel very safe flying with you in the new plane.
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Old 03-26-2008, 11:58 AM   #16
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The overnight zip tie trick is to see if you are getting bleed down. You put a zip tie around the brake lever and the clipon. It should remain tight overnight. If it doesn't you have some bleed down or a leak.
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Old 03-26-2008, 12:10 PM   #17
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Quote:
Originally Posted by bdmpastx View Post
The overnight zip tie trick is to see if you are getting bleed down. You put a zip tie around the brake lever and the clipon. It should remain tight overnight. If it doesn't you have some bleed down or a leak.
Ding Ding, we have a winner!
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Old 03-26-2008, 12:34 PM   #18
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Are you sure you're tightening the bleeder down enough? You have to get them really effin' tight to make sure they seal right...I had that problem for a bit.
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Old 03-26-2008, 10:34 PM   #19
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Quote:
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When you say reseal it are you talking about the lid o ring? Also what is the overnight zip tie trick?


Dang, they are putting you through the ringer. If it makes you feel any better, I will feel very safe flying with you in the new plane.
I am talking about completely disassembling the master cylinder - measuring the piston and the bore for wear, and if all is well reassemble with all new o-rings and seals. Sounds like a big deal, but it's not.


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Quote:
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The overnight zip tie trick is to see if you are getting bleed down. You put a zip tie around the brake lever and the clipon. It should remain tight overnight. If it doesn't you have some bleed down or a leak.
Well - What you are describing to do is right , but the reason is not why I do it. I do it to load the system - not as a leak check, but to help eliminate / purge the air out of the system. Pressuring the system overnight will help force any entrained air to the top where it will eventually make it's way to the reservoir and end up where air is supposed to be - above the fluid - not in it. In my experience it does seem to help firm up the lever.
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Old 03-27-2008, 06:38 AM   #20
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Quote:
Originally Posted by 99eight View Post
What's the most likely source of air making its way into my brakes?

I have new brake fluid and stainless steel brake lines. I'm having to bleed them every track day. Not sure if you guys have noticed, but my brother is on my these days and I can't be having mushy brakes trying to fend him off!
check all connections, when the master cylinder is on the return, it creates vacuum, which in turn could pull air on the system, anywhere from the seal around the caliper piston to each banjo fitting. You need to check everything and because its "new" items does not mean "free of problems or perfect"
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