Air bubbles floating up my brake reservoir.....Please Help

Question

Ok my brakes worked fine before.

I took the front brakes off and put them back on.

When i went to bleed the brakes the rears came good and the fronts would not get all the air out.

Ive checked for leaks 5 times and i can be sure that there are no leaks at the brakes and the brake lines.

Now every time i pump the brakes it starts to get tiny bubbles up through the reservoir.

I think something in the brake booster is stuffed. But I'm not sure what.

I have no front brakes at all only rears.

Also when i bled the rears i got it so i had brakes but very spongy. then when i turned on the car all the brake feel went to the floor and had nothing

Answer 1

First of all never loosen the bleeding plug nut to change your brakes. Use a flat head or jack handle to pry the brake caliber back in away from the roller. But let solve your problem you cause when you did your steps taken. Find you a friend this will take 2 people. Fill up the brake cyclinder.2 with the car off have your friend pump the brakes 50 to 60 times then hold them down.3rd you loosen one brake plug nut till you get a steady stream of fluid coming out of the line/ then thighten the plug nut. Then your friend can let go the brake petol. 4 check your fluid and refil it make sure its filled up/ then repeat the same steps pur wheel brake side do all 4 in these step and it will solve your mishap.  

Answer 2

the brake booster won't do that- its air in the lines.

to get the air out get a bottle or jar with hose and a spanner.  start at the wheel furthest away from the master cylinder, get someone in the car to push on pedal, crack the bleeder until the fluid stops and tighten the bleeder all while the pedal is down.  don't bring the pedal up with the bleeder open or it will suck air in-  you only need to pump it heaps if you are flushing the fluid.  to get the air out you will probably only need to do the proceedure about 3 times per wheel.  if you have clear hose you should be able to see the bubbles while you bleed it.

don't let the master cylinder go empty or you have to start again.

Answer 3

Bleed your master cylinder.  Go to Advance or Autozone.  Get a bleeder bottle for a one person bleed.  Follow the directions on the package.  

Answer 4

bleeding sequence is different on all vehicles, next time you want an accurate answer, you might want to consider the make and year of the vehicle, some vehicles need to be bled with a scanner

Answer 5

dependent on cars then try the following

check all pipes tight..

run the engine and pump brake..hold down,the get someone to open bleed nipple.do this on all wheels makeing sure that the nipples are tight.some cars self bleed to a certain extent.my frontera had its brakes done at a garage,and they spent ages bleeding tham,in the end they were a bit spongey,so i drove very slowly,within a few miles they came back perfect

Answer 6

I had a neighbour once, who decided to repair his front brakes cylinders. Although he was a very long time cab owner and knew what he was doing,and did them in a proper manner, he approaced me when he found it impossible to bleed the brakes.

A quick inspection revealed he had replaced the calipers on the opposite sides he had removed them from.Thus the bleed nipples were lower than the cylinders. Did you do something similar?

The best way to bleed brakes is with a pressure bleeder. Pedal pumping sends the master cylinder piston(s) into areas of the bore they don't normally travel. Depending on the condition of the bore there, damage may be done to the master cylinder rubbers.

Check you have the bleed nipples to the TOP of the wheel cylinder(s), if you have removed the calipers.

Small amounts of air can sometimes be expelled by pumping until you have a firm pedal, and then releasing the pedal rapidly. If the bubbling continues, I think you might be up for a master cylinder overhaul.

The brake booster is not a likely suspect. Just the recoup seals in the master.  

Answer 7

"Master Cylinder is Leaking, Sucking air on the return stroke "Rebuild It!"

Answer 8

Depends on the kind of car, but my guess would be that you ran the master cylinder dry while bleeding.  This will get air in the master cylinder that is hard to get out at the wheels.  It takes two people to bleed at the master cylinder. Have someone push the pedal while you crack the lines at the master cylinder.  Put some rags or paper towels under the lines so they don't get too messy.  If there is air in the master cylinder, it will spit bubbles when you push the pedal down with the line cracked.  You will have to do each line a few times to get it all out.  Then re-bleed the fronts.

Answer 9

If you pump it up too much you break the bubbles up into bubbles that are really hard to bleed out. The easiest thing to do is rent a power bleeder from a tool rental store and bleed those brakes the way we do in a shop. But if thats out of the question then get a friend a length of clear hose (you can see the bubbles better) and a jar (like a mason jar).

Heres a link that explains it better, its not really that hard. And I always open the bleed valve when retracting the pistons for new pads. Some ABS systems dont like fluid flowing the wrong way, besides if you do it right you wont introduce air into the system anyways.