How do I remove the air in the tube on my front brake on a motorbike

If the master cylinder is replaced, care must be taken to prime the new master cylinder by removing all of the air and completely filling it with brake fluid. The spongy feeling is air that is still in the circuits. You will need to bleed the back brakes as well as the front ones again. The order that you bled them seems correct, but perhaps there remained some air in the main trunk lines.

For the best results 2 people are needed. Start at the further distance wheel cylinder and bleed at least three (3) master cylinder reservoir volumes of fluid (back brakes). Bleed the fluid with use of a piece of tubing attached to the bleed port that is long enough to reach almost to the bottom of a long neck or tall clear jar (clear drink bottle works well). When the bleeding begins, after one or two brake pedal pushes, make sure that the end of the tubing is below the surface of the fluid and keep it under. It best to have a clear bleed line (to observe air). Keep pumping the brake pedal while being careful to not completely empty the master cylinder reservoir (leave 1/4 full always). Repeat the same technique for each wheel cylinder with at least two (2) reservoirs full for front brakes. Partially close the bleed ports when almost finished (at least 5 pedal strokes without exit of any air). Completely close the ports during the down stroke of the brake pedal, with the tubing still attached. Be sure each bleed port is closed snuggly.
Most of the brake fluid can be reused, but not the darker portion at the bottom of the jar.

you will need the manual on this one , it has to be done right so as to not get air in thelines when completed

Same as the last 100 years on any vehicle

Start at the farthest point-- back right,left rear,
right front, left front

Every 2 years your flush all vehicles all brakes

You have air in your brake lines. Try inspecting the system for brake fluid leaks. Replace any worn out brake pads, scored discs, leaking brake piston seals, etc.Now place a clear tube on the bleeder screws, one at a time , and bleed the air out of the system with the help of a friend to push the brake pedal. Start at the rear wheel cylinders and finish with the front calipers. Once the air is out of the lines the pedal should firm back up.

This is a bleeding process which i have used for over 10 years on everything from motorbikes, cars, trucks and rally cars.

It is as follows : ------

Use 2 people....i know this may be hard to arrange but i have even used my mom.

Use one person to sit in the vehicle, engine off. Now firstly go to the furthest brake bleed nipple from the reservoir. If the reservoir is located on the left hand front of the vehicle, then go to the right hand rear nipple (with wheels off, preferably). And vice-versa.

Next, with the nipple CLOSED, get the assistant to pump the brakes slowly (do not go fast, it is not a race....lol). Down, as far as it will go, and all the way up....repeat 2-3 times.

Next, get them to hold the brake pedal down, now OPEN the bleed nipple, and ask them to repeat, all the way down, and then up again, 2- 3 times, then CLOSE the nipple. This flushes the system out. Again, sloooowly.

Next, with the NIPPLE closed, get assistant to pump the pedal again SLOWLY 2-3 times, this action forces the remaining air in the system to the nipple end of the brake lines.

Next, have your assistant hold the pedal down, gently OPEN the nipple slowly until the fluid comes out...as the fluid is still coming, CLOSE the bleed nipple. DO NOT let them get to the bottom of the stroke.
What happenes if they reach the floor, and you still have the nipple OPEN, is that a small amount of air leaks into the system, and after a couple of days driving with heat expansion, your brakes are spongy again.

Repeat this 2-3 times on that wheel.

Go to the opposite side of the vehilce now, the left hand rear wheel and perform the same action.

Then the right front wheel.

And finally the left front wheel, the closest to the brake master cylinder reservoir.

Remember to use fresh, new up to date brake fluid.

And use a clear tube or straight into a bucket, so that you can see successfully the air coming out of the system.

Failing this, if you have bled the sytem properly, and this still occurs, and you have no leaks, it is time for a brake master cylinder replacement. As there is a number of rubber seals that keep each brake sytem seperate, within the master cylinder as a safety precaution. If one sytem fails...ie left front brake hose leaks, then that side of the sytem (the left front and right rear, in a opposite system) will leak out, BUT the right front system(which includes the left rear as well)will still maintain pressure to be able to slow the vehicle down to a stop (obviously with increased pedal travel)

REMEMBER not to get any brake fluid on the paintwork, as it is a great paint remover (over time). If you do get it on the paintwork, just wash off with water immediately.

I hope this helps all of those who read this advice.

Please vote if you liked it !!!

And happy motoring.............

right rear,left rear,right front,left front wheels.

i am not sure about the process that you used to bleed the brakes, whether it was a one man bleeding kit, or anything else, but this is a bleeding process which i have used for over 10 years on everything from motorbikes, cars, trucks and rally cars.

It is as follows : ------

Use 2 people....i know this may be hard to arrange but i have even used my mom.

Use one person to sit in the vehicle, engine off. Now firstly go to the furthest brake bleed nipple from the reservoir. If the reservoir is located on the left hand front of the vehicle, then go to the right hand rear nipple (with wheels off, preferably). And vice-versa.

Next, with the nipple CLOSED, get the assistant to pump the brakes slowly (do not go fast, it is not a race....lol). Down, as far as it will go, and all the way up....repeat 2-3 times.

Next, get them to hold the brake pedal down, now OPEN the bleed nipple, and ask them to repeat, all the way down, and then up again, 2- 3 times, then CLOSE the nipple. This flushes the system out. Again, sloooowly.

Next, with the NIPPLE closed, get assistant to pump the pedal again SLOWLY 2-3 times, this action forces the remaining air in the system to the nipple end of the brake lines.

Next, have your assistant hold the pedal down, gently OPEN the nipple slowly until the fluid comes out...as the fluid is still coming, CLOSE the bleed nipple. DO NOT let them get to the bottom of the stroke.
What happenes if they reach the floor, and you still have the nipple OPEN, is that a small amount of air leaks into the system, and after a couple of days driving with heat expansion, your brakes are spongy again.

Repeat this 2-3 times on that wheel.

Go to the opposite side of the vehilce now, the left hand rear wheel and perform the same action.

Then the right front wheel.

And finally the left front wheel, the closest to the brake master cylinder reservoir.

Remember to use fresh, new up to date brake fluid.

And use a clear tube or straight into a bucket, so that you can see successfully the air coming out of the system.

Failing this, if you have bled the sytem properly, and this still occurs, and you have no leaks, it is time for a brake master cylinder replacement. As there is a number of rubber seals that keep each brake sytem seperate, within the master cylinder as a safety precaution. If one sytem fails...ie left front brake hose leaks, then that side of the sytem (the left front and right rear, in a opposite system) will leak out, BUT the right front system(which includes the left rear as well)will still maintain pressure to be able to slow the vehicle down to a stop (obviously with increased pedal travel)

REMEMBER not to get any brake fluid on the paintwork, as it is a great paint remover (over time). If you do get it on the paintwork, just wash off with water immediately.

I hope this helps all of those who read this advice.

Please vote if you liked it !!!

And happy motoring.............

a Master rates about a 5 out of 10 with 10 being the hardest

you may find the hardest part is the actual bench bleeding of the master
and/or
the replacement of the reservoir

These are the instructions from my service manual, but I do not remove the fluid prior to service steps 2-6

1. Disconnect battery ground cable. Disconnect electrical connector from filler cap.
2. Remove fluid reservoir filler cap.
3. Raise and support vehicle.
4. Remove front wheels.
5. Remove dust cap and loosen bleed nipple. Connect a bleed tube to bleed nipple and into a suitable container.
6. Pump brake pedal until all fluid is expelled. Tighten bleed nipple.
7. Lower vehicle. Install brake fluid reservoir cap. Remove air cleaner and air cleaner outlet tube.
8. Disconnect central electrical box electrical connector.
9. Remove central electrical box retaining screw.
10. Remove central electrical box and relocate to air cleaner area.
11. Disconnect brake fluid feed tube. Disconnect brake lines.
12. On models with anti-lock brakes, disconnect brake lines from Hydraulic Control Unit.
13. On all models, remove brake booster vacuum hose.
14. Extract master cylinder from vehicle.
15. On models with manual transaxles, remove clutch hose from brake/clutch reservoir.
16. On all models, remove master cylinder nuts and remove master cylinder.

To install, reverse removal procedure. Bleed brake system.

BLEED BRAKE SYSTEM

Make sure one end of the Jeep is raised (starting with the rear end) and secure on jack stands and the wheels on each side have been removed. If you have been working on the brakes, this should already be done.

Connect a clear rubber tube to the bleeder valve on the right rear brake caliper. Start with this end and side because it is farthest from the master cylinder.Place the tube's other end into a container partially filled with brake fluid.

Open the bleeder valve on the caliper and have an assistant press on the brake pedal inside the Jeep. Look for a mixture of air and fluid to come out of the valve. Once all the air is purged and the fluid runs cleanly from the valve, close the screw and remove the tube.

Repeat the process for all four brakes. Move to the left rear next, followed by the right front and the left front. If you need to, reconnect the Jeep's rear wheels and lower the rear end before raising the front end and removing those wheels.

Check the level of fluid in the master cylinder periodically as you bleed the brakes. If the level drops below the needed fill line, add more fluid. Use fresh fluid, not any that you have bled from the brakes.

Start the Jeep's engine after bleeding all the brakes and press on the brake pedal. You might need to do this repeatedly to seat new brake pads you just installed. Turn off the engine and hold down on the pedal. Bleed the brakes again if the pedal sink within 15 to 20 seconds.