Hello,

Ive been reconnecting my brakes over the weekend/tonight and have a small issue with them.

I have connected all the pipes and blead all 4 corners serveral times, the fuid is now comming out without even the smallest bubble but the peddle will push to the floor on first push, give it a couple of pumps and it would go hard as you would expect leave it a couple of of seconds and it goes soft again!!!

Any ideas? been scratching my head 4 a couple of days with no joy now!

Thanks in advance

paul

How old is the M/C and has it been stood a while with no fluid in it ?

Still air in the system. I would suspect a high spot in the system somewhere. How are you bleeding. I've used an eezy bleed before with a reasonably high pressure and therefore volume of fluid with good effect.

Thanks

Its been stood all winter but has had fluid in nearly all the time.

As for bleeding i have just been using a bottle with a one way valve on the end (off the shelf halfraud jobbie)

either your MC is nacked or you have a connection not as tight as it should be

Sounds like a MC problem to me. Had a similar problem some years ago and it was the MC.

Does your car have the rear brake compensator thingy as i have heard they can be a problem when bleading brakes.

Put the pedal under compression and leave for a couple of days. The Air will be forced out of the system.

Are you using Sierra calipers upside down on the rear? If so you need to whip them off while bleeding.

Common problem, get an assistant to pump up the system and hold the pressure (as much as they can give!). Open the nipple furthest away from the M/C for a split second, repressurise and repeat, work around the car with the same technique, never known it to fail unless there is a fault in the system.

cheers Guys

Got drums on the back still so they shouldnt be causing any problems

Check your rear brake adjustment and make sure the pistons in the rear cylinders are not going back on their own, we found this on some 2cvs just by chance, kept us amused for some time till we spotted it

Is the handbrake properly adjusted? It is possible for the shoes to retract far enough that it takes a couple of pumps to push them back out to the drums, and then when you take your foot off the pedal the return springs push all the fluid back into the reservoir.

Just a thought

Does it still happen if you leave the handbrake on ? if so then the adjusters on the rear drums need adjusting out because the rear shoes are closing in.

Regards Mark

Hi, I use an eeze bleed connected to the wheeh cylinders and bleed back to the M/C. You need to keep an eye on your levels though as it soon fills up. This was most successful on my Alfa which had a floating piston M/C which had bottomed out and caused the same problem that you have.

regards

Steve

No, the air will be forced into the fluid to reappear when the brakes get hot. It does work to firm up the pedal though.

Hi, I use an eeze bleed connected to the wheel cylinders and bleed back to the M/C.

How does this work? I have heard of devices that suck through from the wheel end but nothing that pushes fluid back to the master cylinder. Does someone have to hold the pedal down while you perform the operation?

[Edited on 24/4/07 by Peteff]

After much dicking about i think it is the uion between the braided hoses at the front and the copper pipe as the back brake bite and skid and the fronts have started to bite a bit.

I think if i replace the copper going from the MC to the union all will be ok.

Just need to get some pipe and a means of fairing it now :-)

You could try to bleed them from the wheelcilinders by pushing the brakefluid from there.

Take a small oil-can fill it up, mount a small hose which fits on the nipple and can, pump the fluid into the wheelcilinder. the air will come out on the MC.

If you have done the four corners, bleed ones normal.
Let someone push the brake-pedal then unscrew the nipple which is connected to a small hose hanging in brake-fluid. The pedal will drop. close nipple, push pedal, unscrew...etc

[Edited on 27/4/07 by t.j.]

Ill give that a go Ive been trying to work out somthing like that