Question about Motorcycles
My bike had been sitting for a while and when I was gonna ride i had no rear brakes the resivoir was full of fluid. I tried to bleed the breaks and still no pedal. I checked to make sure I was getting fluid to the cylinder from the resivoir which I was, but i cant get fluid flow from the cylinder to the caliper. No fluid will flow through the cylinder. I took it apart and it seems to be fine cup is good spring is good rear seal good, but no fluid flow.
A master cylinder bore has two small holes in it. One is the supply hole the other is the bypass port. Typically master cylinder issues are created after long periods of sitting when one or both of these holes are plugged. Be sure you can visually verify with a brake cleaner spray that they are both open and clear when you dissassemble the cylinder. Also be sure to use the correct type of brake fluid and do not mix DOT 3/4 with DOT5. Begin your bleeding process at the m/cyl banjo bolt and work your way back bleeding at all the banjo bolts and the bleeder screw last. Good Luck
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Posted on Jan 02, 2017
Are you bleeding it by gravity (flowing down from resevior thru caliper) or forcing the fluid up thru the caliper to the resevior. The latter will get more air out in less time. Simple cheap pump kits are available at you auto dealer and u can use it on your other vehicles.
Posted on May 14, 2009
SOURCE: Rear brake cylinder and bleeding
Relax....KTM's are delicate in this procedure.
First of all make sure that you are using DOT 5.1 brake fluid and not 4 as we use in the Japan models.
Then take the rear caliper in your hands and push the piston all the way in.Then bolt it on its position.
Bolt on the brake hose to the rear caliper tight and leave it loose on the rear master cylinder side (loose but ready to tight it on like half circle loose) and clean up the reservoir completely.
Take a syringe from a pharmacy and a piece of 3mm clear tube.
Start pushing brake fluid in the caliper's loose bleeder until you see fluid coming out fron the hose's loose end on the master cylinder.
The tight the cylinder's bolt and keep pushing fluid until you see it filling up the reservoir.
When you see the reservoir fully filled up, tight the bleeder, take out the syringe and start pressing the brake pedal 15-20 times and the last one keep it down and loose the bleeder (with a tube attached to it and to a bottle) for a sec to relieve the pressure along with any air bubbles.DON'T LIFT THE PEDAL UNTIL YOU HAVE TIGHT BACK THE BLEEDER or the system will **** air in.FIRST tight the bleeder and THEN loose the pedal.
Keep doing that until NO air comes out of the system.
While you are doing this second stage keep filling up the reservoir and do not let the master cylinder **** air in.
Posted on Jun 15, 2009
you need to bleed the brake, attach a hose into a small can of brake fluid, the other end to caliper bleed valve (5/16), its covered with a little rubber boot on the caliper. pump brake pedal, hold it down, open the valve ( turn left) flluid and air comes out, then close valve.repeat untill no more air comes out and brake pedal becomes stiff, about 10 times
Posted on Jul 12, 2009
your brake fluid is shot ...no good, must be drained and Reserviced and bled.... use dot4 and insure all your brake lines are clean and in good shape.
Posted on Oct 05, 2009
Hi, If there is excessive air in your system after reassembly of master cylinder, the lever will have a spongy feeling about it and possible inconsistency or will have travel, bleeding the hydraulic system is best carried out by two people, remove the reservoir lid, top up over half and replace lightly to keep out dust, get a old glass jar, and a clear pipe that pushes down into the top of the bleeder valve, which is on top of the caliper block, and sink pipes other end into a little brake fluid in the glass, ensure there is always sufficient brake fluid in the reservoir tank, top up later if needed, use open spanner for bleeder valve, unscrew the bleeder valve one half turn and squeeze the brake lever as far as it will go, but do not release it until the bleeder valve is tightened again, repeat this a few times until a no more air bubbles come from the plastic pipe. Also, ensure all other joints are secured in this brake system, When all the bubbles disappear, close the bleeder valve, remove the pipe and install the bleeder valve dust cap. Check the fluid level in the reservoir, after the bleeding operation has been complete. Reinstall the Diaphragm, and the cap. Do not use the brake fluid drained from system as it contains minute air bubbles. There was the question of the locking pads, after the air is removed from the calipers, and there is still a prob, I might have the answer
Posted on Jul 05, 2010
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