brakes fade after parking in the sun

kiai · 05-17-2008, 9:50 AM

Hello,

have anyone noticed thier front brake pressure to seem funny after parking the bike in the sun for a while kinda like its losing pressure and feels really spongy, weird thing the feeling goes away after riding the bike fast for a while. not sure what is it any explanations ?

ghbzorro · 05-17-2008, 10:10 AM

Is the master cylinder reservoir full? Just how old are the brake lines?

bignibb · 05-17-2008, 10:26 AM

brake fluid could be getting baked in the sun?

Knee Slider · 05-17-2008, 12:56 PM

Quote:

Originally Posted by ghbzorro

Is the master cylinder reservoir full? Just how old are the brake lines?

Fit Braded hoses.....

machinehead · 05-17-2008, 6:45 PM

and fresh fluid - when was it last changed? Mines done yearly as a minimum, sometimes more often if I'm doing a lot of miles and/or a lot of track days

slickwill · 05-17-2008, 10:13 PM

Quote:

Originally Posted by kiai

Hello,

have anyone noticed thier front brake pressure to seem funny after parking the bike in the sun for a while kinda like its losing pressure and feels really spongy, weird thing the feeling goes away after riding the bike fast for a while. not sure what is it any explanations ?

Hot spongy rubber hoses would be my guess.

rokitt51 · 05-18-2008, 1:28 AM

Quote:

Originally Posted by slickwill

Hot spongy rubber hoses would be my guess.

Abjatrer · 05-19-2008, 3:59 AM

Quote:

Originally Posted by slickwill

Hot spongy rubber hoses would be my guess.

Bearing in mind, he is located in Egypt. A hot country most of the times.

JariCBR900RR · 05-19-2008, 5:25 AM

Please do change brake fluid soon, it's an easy and quick job, and report did it change anything.

if your brake lines are still original it could be a good idea to change them.

-J-

kiai · 05-19-2008, 5:49 AM

I've braided hoses, and I've just replaced my fluid few weeks ago the reservoir is just on the top line I've fit new ebc HH pads in.

sun is very strong in here UV index is always 10+ in the summer

I've never felt these issues in the winter sun where UV index is around 3-4

JariCBR900RR · 05-20-2008, 1:35 AM

Did you have this problem before new ebc HH-pads?

Just wondering if they would not grip as well as you expected before properly heated up?

-J-

Quote:

Originally Posted by kiai

I've braided hoses, and I've just replaced my fluid few weeks ago the reservoir is just on the top line I've fit new ebc HH pads in.
..

kiai · 05-20-2008, 3:29 AM

it's not the pads they EBC HH are great, this issue been happening to me on several bikes even

HondaGalToo · 05-20-2008, 7:39 AM

If you've recently changed your fluid, I'd guess you just need to bleed more. Do you have a bleeder nipple at the master cylinder? That helps a lot.

kiai · 05-21-2008, 11:34 AM

no bleed nipple at the mc but I just work with the banjoo bolts speaking of which know any place to get them ? anyway you sure this is air in the system thing ?

JariCBR900RR · 05-22-2008, 12:35 AM

Quote:

Originally Posted by kiai

no bleed nipple at the mc but I just work with the banjoo bolts speaking of which know any place to get them ? anyway you sure this is air in the system thing ?

If there were air left is the system it you would notice it even if not parked in the sun.

If there were moisture (ie.water) in the brake fluid it would boil if heated (evaporate to gas) and cause brake feel spongy.

-J-

kiai · 05-22-2008, 3:30 AM

when I worked my brakes they were solid it's just that when I park the bike in the sun it always feels spongy again and gets better as I ride but the first gew grips on the brakes feels very strange and after a month or so the brakes feels like it have air all the time bleeding them again usually fixs the problem.

machinehead · 05-22-2008, 8:06 AM

it does sound like air in the system - I had trouble with bleeding the 954 brakes, but speedbleeders are teh way forward and not had any problems now.