YBR 125 front brake issue

gingerbeardym... · L Plate Warrior Joined: 26 Jul 2013 Karma :

I can easily pull back the front brake handle all the way to the handlebar despite having bled the brake fluid several times and filling the system up with large amounts of brake fluids and the seals have all been replaced a week ago; is this a normal thing or does the master need an overhaul?

Pigeon · World Chat Champion Joined: 27 Sep 2012 Karma :

If there is no pressure, there must surely still be a truck load of air in the system.....or a leak.

Manual bleeding after replacing seals can take a very long time.

Reverse bleeding using a syringe knocks time taken down by 90%.

tterminus · L Plate Warrior Joined: 19 May 2013 Karma :

No that isn't normal.

My "basket case" YBR 125 the front brake lever pulled all of the way back and I could still move the front wheel. I then replaced the pads and bled/filled the reservoir at which point the front brake worked.

I found the biggest change though to be bleeding the master reservoir (might not be the right term), so with the reservoir lid and seals off I simply pulled the brake back which forced bubbles out. Kept doing this (and occaisionally topping the reservoir up with DOT 4) until no more bubbles appeared.