Tried to fix the GPZ today and made a hash of things....

[c_dug]

Firstly a nice simple one, any tips for fitting a split link o-ring chain, im having alot of trouble with the o-rings and getting the whole lot squished enough to get the split link on, ive just borrowed a G clamp to give that ago but other than that im all out of ideas, any suggestions/tips?

Secondly, my breaks siezed up from sitting outside and not being used much, I've never worked on sliding caliper brakes before and managed to get in a bit of a muddle with the re-assembly, i spent the best part of an hour getting the damn things back together, there was some type of metal clip/bracket in the bottom that was a pain to get seated (i doubt that makes sence without seeing it)

Anyway now ive lost all break pressure completely which is quite a worry, i havent lost all the fluid so im at a loss as to whats gone wrong, my only guess is that ive gone badly wrong on the re-assembly, unfortunalty my haynes is a little sketchy on the front brake, well either that or the more likely thing, im an idiot

So any suggestions/thoughts on what may have caused the loss in pressure?

cheers

c_dug
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I am a bellend, I am a man of constant sorrow, I am a gummy bear, I am a rock.

[SoND]

[stinkwheel]

[c_dug]

My brakes wern't pumped whiles't off so i cant figure out why the loss in preassure, it's the anti rattle spring that i think i've got wrong, i think.

Basicly i think i got it all back together alright, I couldnt work out what was supposed to be keeping the pad that sits against the pistons in, there didn't appear to be any sort of pins or anything, the anti rattle spring looked as though it had two tabs which extended round onto the edge of the pad to secure it, is this right do you know?

Oh and im definetly not trying to fit the split link over rivots, im not that bad

c_dug
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I am a bellend, I am a man of constant sorrow, I am a gummy bear, I am a rock.

[stinkwheel]

Are the pistons moving when you pump the lever?

[Cigaro]

Just bleed your brakes and they should be fine.

As stinkwheel says, there are no pins or anything to hold the pads in. When the calliper is on the disc, it is held in place by those two little metal retaining clips, and can't fall out because the disc is in the way.

The 'anti rattle spring' is the small metal plate (never knew that's what it does, though, but I assumed it was important ), on mine (looks like the same calliper design except mine is single piston) there's a little tab that sits against the bottom of the outside pad.

Attached paint diagram might make more sense. Anti rattle spring shown in blue.

[Cigaro]

A better one showing the other pad, disc (in black) and the 'little metal retaining clips' i was on about.

Note that the tabbed edges of the other pad fit underneath the retaining clips.

[Cigaro]

You'll know when you've got it together right anyway. It doesn't really 'look' right any other way.

[SoND]

Seal in the mastercylinder can go when you push the piston back in.
____________________
Go back to bed - You have no rights - "Streetfighters ~ Mainstream motorcycling's crackwhore sister."

[Cigaro]

Would say it was unlikely to be that, though. Especially if you've not noticed any leaks. As I say, just bleed it up and it should be OK.

[c_dug]

Some brilliant stuff here guys, thanks.

It certainly looked right when i put it together which is why i was puzzled when there was no pressure at all, i guess bleeding the brakes is the next step then.

I'll keep you posted.

thanks again

c_dug
____________________
I am a bellend, I am a man of constant sorrow, I am a gummy bear, I am a rock.

[SoND]

[c_dug]

First things first, this...

[stinkwheel]

[c_dug]

[quote="stinkwheel1) Because it has less friction from the seals compared to its surface area and therefore moves more readily when the fluid pressure increases. The path of least resistance. As long as the small one moves when the big one stops against the disc, that's fine.[/quote]

With a clamp on the bigger of the two pistons the smaller one did move

Something that i dont understand is that there was plenty of pressure to start with, then i took the calliper apart and cleaned it out however i am certain that no seals were broken at this stage, then i re-assembled the calliper and there is no pressure, how could air of got into the system like that?

My dad suggested that some sort of seal on the master cylinder may have gone, i cant remember which one. Im guessing its easier to clearly describe what im finding over the phone than on here so mayby he's right, any suggestions as to what seal he was on about and any thoughts on the idea?

c_dug
____________________
I am a bellend, I am a man of constant sorrow, I am a gummy bear, I am a rock.