20 replies to this topic

[grahama]

Hi all,

 

ok,  new callipers, new rear drum cylinders, rebuilt master cylinder and untouched bias valve.

 

I have no leaks anywhere, hence the new callipers and cylinders.

 

I have been using an Eazi Bleed kit and bleeding furthest to nearest master cylinder in turn.

 

I have bubbles coming out and have repeated the process 4 times now.

 

Here's what I get after each attempt...

 

 

No pedal, hits the stopping point, but then I start to get firmness when pumped.  This is low down the pedal travel and with as much force as I can I can get the pedal to hit the stopping point, but it hard.  After leaving it for a little while I am back to the no pedal situation, as it air is leaking back in !!

 

 

I have checked every joint, all dry, the new callipers and rear drum cylinders after the 4th attempt, all dry.

 

The master cylinder seal is ok and I have tried sealing it with tape to see if that is leaking air, but same problem.

 

 

Where do I go from here???

 

 

Regards,

 

Graham

 

[mini13]

I have never had much luck with the easy bleed's, I always use a long length of aquairum hose ziptied into position so it goes back into the master, then I can jsut keep pumping fluid through and watch it.

[Swift_General]

Are you sure you're using the eezibleed kit correctly? What air pressure are you using? To (at the very least) get fluid at the nipples should be no more difficult than simply opening the relevant nipple. Have you got the calipers on the right way?

[grahama]

Calipers nipple on top.

 

spare wheel pressure at 14PSI and using correctly (air pressure to reservoir, tube to master cylinder, open air pressure, open bleed nipple till no bubbles)

 

I get fluid coming out of each nipple all round no problem.  

 

 

After reading some previous posts I have adjusted the rear drums up correctly and pumped the pedal again to get some pressure as before.  I am leaving it overnight to see what happens.

 

What should happen lol ??

Edited by grahama, 10 October 2018 - 03:47 PM.

[Spider]

Like Mini13, largely, I've not had total success with the Ezibleed, I have found them really good for getting a new and dry system started, but once getting some fluid out of the first wheel cylinder / caliper, I swap over to the old fashioned method of pumping the pedal, with a short hose in to a jar, similiar also to what Mini13 has suggested.

 

The Ezibleed I don't think makes enough pressure and volume to get all the air out.

[motorwise]

increase the tyre pressure to 20psi then go round the car twice if you still have no pedal it could be a master cylinder problem .... another thing you can try is prop the brake pedal down overnight and all being well it'll be rock hard in the morning 

[imack]

Only thing I'd add to the above replies is that I'd bleed the brakes with all the pistons pushed back into the calipers and rear cylinders. This minimises the volume behind the pistons and the risk of trapped air pockets.
I usually push the caliper pistons back and wedge half a wooden clothes peg between the pads and pistons to stop them moving if pumping the pedal. Slave cylinder pistons I generally hold squeezed together with a pair of gland pliers while bleeding.
You also say the calipers are new, probably worth pumping the pistons out a little (not too far or theyll pop out) and lube with a drop of brake fluid on the tip of a screw driver and then push the pistons back into the caliper incase dry sticky seals are causing the pistons to retract too much when lifting off the brake pedal.

[grahama]

Have wedged the pedal so will check tomorrow after work if dry.

Pistons were in as all new but can push back and wedge easily enough to try something new.

Thanks for the replies

[cal844]

Use the old 3 man method, one man to pump the pedal, the second man cracks the nipple and the third tops up the fluid as needed.

Make sure the caliper nipples are at the top. You also may need to crack each union and let the air bleed off then tighten the union again

[Vipernoir]

I've tried Eezi-bleeds, vacuum bleeders and witchcraft over the years...  Can't beat a bloke on the pedal and another on the nipple.

[Spider]

,,,,,,  Can't beat a bloke on the pedal and another on the nipple.

 

Woooooyyyyy ,,,,, I like the sounds of that

[nicklouse]

the good old gravity bleed can sort out many issues.

 

open the bled nipple and just top up the fluid as needed and dont touch a thing.

[Bat]

Hi,

I've never tried gravity bleeding a mini!

I take it you've had plenty of success with it?

Cheers 

[grahama]

Ok,

Checked this morning after leaving brake pedal pressed overnight.

Front hubs are solid with the brake pedal, rear drums I can move by hand.

The drums are adjusted correctly to a drag when turning.

Incidentally the brake pedal when I do have pressure is right at the end of travel.

If I am getting fluid out of all corners without bubbles does it mean I have no air in the system ??

[Spider]

Ok,

Checked this morning after leaving brake pedal pressed overnight.

Front hubs are solid with the brake pedal, rear drums I can move by hand.

The drums are adjusted correctly to a drag when turning.

Incidentally the brake pedal when I do have pressure is right at the end of travel.

If I am getting fluid out of all corners without bubbles does it mean I have no air in the system ??

 

It does sound like your Brakes are working about as they should, but you still have Air in the system.

 

Try the old fashioned way of bleeding, with 2 people.