Help! No brake pressure after pad change.

[SA14]

Until the pros and super experienced come back in with suggestions I'm going to hazard a guess that if you're bleeding fluid out of the nipples and banjos it sounds like your pump is working ok. Have you tried starting all over how I suggested? If everything is working correctly the only thing I can think of is a stuck air bubble somewhere. Let the fluid run out of the banjos then the bleed nipples by gravity as the video suggests. It has to work.

In that video he says that if you get an air sack stuck behind a piston it will be a bugger to bleed and that sounds like what you're experiencing. Treat your system as a totally dry system or even drain it all out again and start fresh. You may even have to pull your calipers apart to make sure nothing's stuck in there or something basic's failed but even if you do that you'll still be up and running within an hour or two like I was and remember, I was clueless to start and it worked for me. So unless you have some sort of mechanical failure in the system it will work and you can still go out on your ride today.

[VladTepes]

OK so there MAY be a weep on one of the inside pistons of the LHS caliper.
So I may give up and take it to a shop as I have neither the time nor inclination to screw up rebuilding it..

I'd have thought a full rebuild seals would last more than 5 years but...

[KiwiCol]

So would I, 5 years isn't a long time in your climate - blighty, yes.

[grog]

Me also, last ages normally.  Still dont think thats your prob, you would still have lever pressure. Also how can seal leak with no pressure on it. When you pump lever, banjo loose, any fluid squirt out? If you crack caliper connection, does fluid leak out? If it does, any more flow squeezing lever? Its either air or piston stuck in Master.

[gsxbarmy]

So if you take the calipers off and take the pads out - are the pistons moving? Take off one caliper at a time to check this. It does sound like there is air still in the system, but I suspect your initial issue was with the pistons (or not all of them) moving properly.

Sometime for bleeding I've found you have to have two people as the bleed nipples can vary as to when they choose to let air out or not - sometimes its a small opening of the nipple, sometime - to get the flow of any air bubbles out - you need to open the nipple 1 or more turns.

[seth]

I trick that might help
If you can pump out the pistons ( yes with no/ little  preasure and get them to go out) then losen the bleed nipples and push them in again re tighten the bleed nipple again .
It can help remove air trapped in am awkward place in the system .
Good luck

[VladTepes]

1 When you pump lever, banjo loose, any fluid squirt out?
2 If you crack caliper connection, does fluid leak out?
3 If it does, any more flow squeezing lever?

1. Do you mean at M/C ? Well it comes out, I dunno about squirt.
2. Brake line banjo at caliper? Yep.
3. Not really.

2&3 actually more flow on the RHS caliper, than the left.
I'm suspecting the master cylinder which is bad coz its the likely most expensive option.... 


/whinge mode on
My missus keeps telling me to sell the bike coz its old and everything is breaking... it's not at 2007, and everything isn't.
Much of it is maintenance but she doesn't see that coz her car just goes to the dealer and gets magically serviced. fixed.
/end whinge

[SA14]

/whinge mode on
My missus keeps telling me to sell the bike coz its old and everything is breaking... it's not at 2007, and everything isn't.
Much of it is maintenance but she doesn't see that coz her car just goes to the dealer and gets magically serviced. fixed.
/end whinge

Just as well we don't apply that logic to how much time they spend on their faces. No offence lol, I'm sure she's lovely. Couldn't resist.

[seth]

@VladTepes
1/ at the calipers at the bleed nipples and the banjo bolts .
I use the same trick in the clutch slave cylinder .

[stick3]

vlad i answered  your question on facebook with the pics of vacumn pumps i dont know if you have braided or rubber hoses fitted  you can get hose clamps or vacumn plugs that fit into the bango fitting and i would suck out as from the m/c leaving some on the bottom so not let air in

filling than after flushing it into a container clamp or plug  than you know there is no air in the m/c try any auto store for clamps or vacumn plugs these  are the vacumn plugs https://www.ebay.com.au/i/184325131107?chn=ps
 

[VladTepes]

Yeah mate cheers I saw that - have a pump on order.

Will try to see if I can get any pressure at the lever by bleeding at the MC banjo - I only tried it a couple of times , this time I'll persist for a lot longer and see if I get anything.

On account of inability to ride to work, I have had to catch the train with the 'great unwashed'. To be fair though , they are probably worse off as they had to catch the train with me! 

[VladTepes]

Will try to see if I can get any pressure at the lever by bleeding at the MC banjo - I only tried it a couple of times , this time I'll persist for a lot longer and see if I get anything.

Well 20 minutes of that was a miserable fail. 

[grog]

Mate, if master wont pump to top join, as in, push fluid out, its not working. Piston stuck maybe.Seals no good.If piston has been pushed out of its normal travel, seals can be torn by unused part of bore, rough because never used. Reason we only ever do tiny moves bleeding, not total travel.

[KiwiCol]

I just had a look at the pic of your bike in the back in black thread.  Do you still have the dual lines off the master?

[KiwiCol]

An idea for you in your struggles, seeing as how bugger all is working for ya.   
Take the calipers off the fork, tie them to the garage ceiling by the bleed nipple with a bit of string, getting them higher than the master.
Leave overnight (or a while at least) The idea is the air will go to the highest point, the bleed nipple.
Next day, open bleeder whilst still up there, give a wee pump n close.
Refit calipers & have a try then.

Weird, by may work for ya.  The air wants to go up, so let it up n bleed that way or do a reverse bleed in situ.