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Viagra for brakes?

speed-itch2010-06-30 06:39:28 +0000 #1
My front brake needs Viagra or something. It softens over about 2 weeks after bleeding it. I have used a zap strap to keep the lever fully depressed while parked in the garage for 48 hours, and I can find no leaks of fluid. What is happening? Is this normal that the brake needs bleeding this often?


KillahK2010-06-30 06:53:21 +0000 #2
what kinda bike.. how old is it? how old are the lines and master?

sure doesn't sound like any normally functioning enclosed brake system would/should do....

im no expert, but i would definately get it checked and spend the money it takes to KNOW that your brakes aren't going to let you down...
NFG2010-06-30 06:57:01 +0000 #3
Air leak somewhere would be my guess. Look harder. Check your lines as well as the banjo bolts.

Also how are you bleeding them? More info please.....
rawdonflyer2010-06-30 07:16:08 +0000 #4
your brakes have an internal hemmerage. the master cylinder is most likely is bypassing(leaking pressure past the 'o' rings on the piston.) rebuild the master or replace it.
PRSmechanic2010-06-30 08:26:06 +0000 #5
Just for your reference, I have the same problem with my '83 KZ750. I did put in a rebuild kit, and it made it better, but not like new. I think I will have to get a new master cyclinder. They work, I can pumop them up, but they come too close to the bars for braided line, and shouldn't be soft or require pumping up as they are air free

Sigh, old bikes, obsolete parts...

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