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Brakes locked

M

motoguzziv50

Just got it firing!
Joined
Nov 20, 2011
Messages
3
Location
ruidoso, NM
I'm stuck, my V50 rear and left front brakes lockup when the temp go up during the day. They release when the temp goes down, The problem started without any assistance from me. I ride the frequently, replaceing the fluid about once a year. After the problem srarted I removed dis-assemled/re-assembled the rear master, did not see anything wrong with it. bleed the lines, etc. Any ideas?
 
Make sure the M/C piston is returning fully. If not the seals may have swelled due to differing brake fluids.

Pressure is building up so there is air in there somewhere. Bleed throughly by cracking all the joints from the M/C to the calipers.

Ensure the 2nd feed hole in the M/C is clear.

Just a few suggestions.
 
Fairly common in automotive applications. Brake hose may be swelling and pinching on the inside acting like a check valve, hose will look great from the outside. Next time they are locked up try breaking the hose connection closest to the master cylinder or splitter first. If the hose is collapsed on the inside the brake will stay locked because the hose is not allowing the fluid to flow back. Next brake the connection at the caliper. If it is still locked then the problem is in the caliper.

It actually may not be heat related but more "use related". How often do you sit on a "cold" bike & pump the brakes? However when you are riding you are constantly using them without thinking about it. For instance the next time you leave the house count how many times you have hit the brakes before the first stop sign at the end of the street. A collapsed brake hose will not close up all the way so as the bike "cools" down the fluid slowly seeps back into the master cylinder so it appears as though temperature is playing a part. I have seen hoses that would stay locked up over night.

So before the next ride just try sitting on the bike and pumping the brakes a lot to see if they will lock up. If they do follow the steps above.

I would appreciate you posting what you find out so others can benefit.
 
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