I changed hub on my 02 Toyota avensis and connect brakes bled them also but brakes are still very spongy and working very badly

[Davidm14]

My brakes in my 02 Toyota avensis are not working after back hub replacement any ideas How to fix this problem 

[Greydog]

Maybe "teaching Granny" but when you bled your brakes did you make sure the Master cylinder was topped up? If air got in that side it can be a major pain to get the air out. I know some makes need the abs cycling with software to bleed them.

Assuming that no air got in at the Master cylinder did you have the engine running while bleeding again some systems need to be energised to clear any air.

[gazza1286]

I've never had to have the engine running for the Avensis (or any Toyota) to bleed the brakes - so you're lucky there.  

If as suggested the master was low air could have entered the system. When you removed the hub did you put a bung on the pipe? If not then it may have drained (and siphoned) fluid from pipes supplying other wheels. I think you're going to have to bleed all four wheels. 

[Konrad C]

I always pressure bleed using Gunson's system. I use a pressure of about 25 psi or higher. This gives a good chance to force the new fluid throughout the brakes and speeds up the time to complete the job. One complete cycle should be enough, but I do two and watch the level of the top up bottle.

Pumping the pedal does not cut it.

[Attarren]

 + 1

There's air in the system somewhere. You need to bleed it again to get it out.

[TomdeGuerre]

I'm with Greydog here, I've had numerous cases with cars - and light trucks with hydraulic boosted brakes as against air brakes - where I've had to have the engine running to get the system bled properly. Depends for one thing on whether the servo brake booster valve is over sensitised.

Of those who bleed the brakes manually, some pump the pedal up furiously, hold it tight then get someone to open the bleed valve and slam it to the floor (idiots) some do it with the bleeder valve fully open all the time but forget to keep it immersed in the fluid so they get a nice little stream of bubbles shunting back and forth..... to each their own.

My faith in pressure bleeders diminished a little when I turned the master cylinder seals inside out due to using a skinny spare with 65 psi as the pressure source. 

Myself, I prefer the "wife system" where I sit in the car to pump the pedal while she checks the master cylinder level, goes round each wheel and bleeds them, shouts me to push the pedal down, let the pedal up etc and I've never had any problems that way!   

[Davidm14]

12 hours ago, gazza1286 said:

I've never had to have the engine running for the Avensis (or any Toyota) to bleed the brakes - so you're lucky there.  

If as suggested the master was low air could have entered the system. When you removed the hub did you put a bung on the pipe? If not then it may have drained (and siphoned) fluid from pipes supplying other wheels. I think you're going to have to bleed all four wheels. 

I bled all four wheels and the brakes are still spongy ,but I never looked at the master cylinder maybe that could be it when I disconnected brakes from the hub I just screwed off that's all the brakes are terrible now not even dmsake to drive the car if it is not the master cylinder what other problems do I face 

[Greydog]

After reading the above if you didn't check the Master cylinder that is where your issue is. Your Master cylinder is probably empty now so all you are doing is pushing air around fingers crossed there is no damage to the seals. Make sure you have enough fresh brake fluid to hand I would also put some paper towel around and under the master cylinder to catch spills brake fluid is aggressive stuff if it gets onto paint.

Start by refilling the master cylinder and gently pumping the pedal to pre-load the servo check the master cylinder because it doesn't take much action to empty it, keep it topped up. Then start the bleeding process one wheel at a time, several others have described the process just remember to keep an eye on the master cylinder and keep it topped up. Personally I would never re-use old brake fluid as your putting new in. Just make sure you dispose of the old fluid safely at your local tip they all have an oil container these days.

Good Luck

[TomdeGuerre]

So someone wit enough savvy to strip the braking system and change a hub didn't know enough to replenish a master cylinder and how to bleed the brakes hmmmmmmmmm - as we say in Scotland aye, right.

Still and all, cutting you a bit of slack (about 50 metres) just be sure you don't buy DOT 5 fluid to put in otherwise you'll be back on here.