Vespa Px front hub Problem (Again)

[fredperrybruce]

Hi all again,

This is a followup on my last thread,, having struggled to take the front of my hub off to change brake shoes I now have no brake movement at all once the covers back on.

It's a little tight getting the cover back on and once it is on I can't get any movement in the lever on the hub its like the brakes already on before I pull the brake lever.

I slacken off the cable (right off) open the hub everything's in the right place and seated properly but soon as cover goes back on, nothing wheel barely turns. ?

If I take the shoes out it it turns nicely and turns true no wobble or warping

I have now smashed my speedo cable and drive due to the front wheel locking up!!!

Any ideas? please

[henri]

with new shoes on does the hub turn or is it tight an binding ,which make of shoes an where did ya get them from ,as not all shoes are good enuff quality to be sure of the fit , i think i'd be taking the shoes back an saying there no good ,are ya sure the clips fitted to end of shoes are seated properly ,or have ya thought of trying them without the metal spring clips til they wear in a bit ,H                                                                                                                              just re-read ya post an you say the speedo drive is now broken , maybe its not engaged the gears properly when youve put hub back on an the speedo drive damage is whats stopping the wheel turning freely . 

[fredperrybruce]

I brought the Piaggio shoes and basic ones they both have the same effect when the covers on,,,, Tight as hell. When you say metal clips are you talking about the clips that come with the brake shoes??

I'm just puzzled why I can move the lever on the hub , there's no movement at all?

[fredperrybruce]

I've taken the speedo drive out now ,, So I will try putting the hub back together tomorrow and see if that has made any difference.. Is it normal to have a tight fit with new brake shoes??

[sbwnik]

Yes, and it's good practice to file the leading edges slightly, but I've never come across a set doing this before.

They are sitting in the cam correctly?

[rab]

take a picture with the shoes in and the hub off. get it in this thread one of us may be able to see the cause its worth a shot

[henri]

agree with nic that feathering the leading edge is a good idea as it helps prevent grab ,tho ive given up diagonal cuts across face we use to do as kids,was supposed to clear water faster in the wet,dont know if it ever worked just was the fashion on moto-crossers back then ,oh to have my CZ ex-works 250 bike now ,engine would fit nice in a bretta frame ,
an agree with rab a few choice piccys might help to spot anything obvious .did old shoes have the clips on them as ive found them missing before on a scoot with a pattern hub an when i put new shoes on with clips the hub wouldnt go over them .a genuine hub should have a piaggio mark on its inside .an ive found pattern shoes coming oversize in the past ,they were meant to be skimmed to be round in situ with a sort of hub that went on shaft with adjustable wood-plane type blades fitted .but that was many many moons ago ,an youve tried genuine an knock-off ones an had same result.vespa brake shoes come in different sizes/shapes ,are ya sure the hub is right 1 for scoot/shoes youve bought,tho i cant think of another hub that would fit .if all else fails file the flats on cam down a tad so shoes sit closer together an hub fits ,then take up slack/distance in the adjustment .only a tiny tad at a time ,put hub on an try it , is there any signs of welding on cam faces as sum people build em up when worn which can give problems when new shoes are bought if over done. H

[sbwnik]

IIRC the cutting of brake shoes was to aid cooling, not water dispersion?

Don't think it made a lot of difference though, they were cr@p when cold!

[henri]

ya might be right there ,was a long time ago ,failing memorys runs in my family ,like other things ,my bottom after a night on the beer or my brother when he see's me coming ,but this is off the thread,
cmon fredperrybruce how about a update/piccys like rab asked n i seconded, your only in pompey an i go past there often ,do like the gypsy asks n cross my palm with silver (petrol money)an i'll come have a gaze at this mystery hub thingy, if silvers to rich for ya blood a strong coffea an a fat roll-up will have to suffice ,i'm curious to see whats wrong ,an a trip to pompey is a gud excuse to go show allstyles the lining of my wallet,where the money use to be before i gave/they extracted it from me. Henri

[fredperrybruce]

Hi, all , Sorry I've not posted on my recent problem ,,, Right here goes!!! Took whole hub/drum off to find that there's washers and seals damaged inside,, the problem now is I don't know what parts go where . I need someone to take a look HENRI.....Please

[henri]

pm sent ,as explained in pm got my family s##t to cover but can put eyes on the weekend ,need to go give allstyles sum more hard earned anyway , this way the "management" will sign off on it an i come out looking like a good guy,lookin good=a brucie bonus, an what that means is between me an my beloved the "management" .if ya really curious pm me an i will explain, when ive got a signed disclaimer that your over 18 an not of a "delicate disposition" countersigned by ya mamma , cheers henri ,

[kru251]

I thought 'we' put diagonal cuts in the shoes to aid dispersion of brake dust!!!! I still do this to disc brake pads on Lammies.
I have found this 'jam' situation before with brakes and certainly always chamfer the two ends nearest the cam to give a progressive bite.
I have also had a set of aftermarket Lammie brake shoes that I had to actually file the shoes over the whole area to allow the drum to fit over them at all. This wasn't though original factory shoes but a better, softer version that actually stopped the thing!!!

[henri]

on disc's i usually do some diagional file marks across the pads before fitting , not for dust dispersion like on inboard lammie discs but on bikes where there out board an dust is dispersed "naturally" ,but have found it beds the pads in super fast ,1 too many new pads in an off on test ride an no braking from caliper for first few uses moments ,not ever had a bump because of it just a few hairy moments . Henri