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And you thought your back brake was bad...

Joined May 2008
379 Posts | 0+
Norfolk
Everyone is always complaining about how crappy the rear brake is on these bikes...

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fastest i ever stopped on the back brake!!! :biggrin

thats the story behind my galfer wave disc, it was not much more expensive than getting a stock replacement disc, just for the record, putting sintered pads in made a huge difference i found, not sure but i dont think the standard pads are sintered material

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and dont worry, yours probably wont do that, unless you're a complete **** and mess around with stuff you shouldn't :doh
 
Forgive me I am a complete **** and messed around with stuff. I have a rotor and set of rear pads that look just like yours. I bet I know which part you mis-adjusted.

I have new Brembo Sintered HH pads on order from Yoyodyne. I am going to try to use the old rotor and hope the sintered pads clean the mess. I will break the glaze and should be good
 
:wow im not alone then..

bad luck m8, hope you stayed upright like me, i keep the rainbow disc on display in the garage.. i tried everything to get the crap off the disc but nothing was sorting it, honestly i wouldnt expect using new pads on a disc like that will work very well. someone did tell me its possible to get a disc re-shimmed or something, but it would have cost almost as much as a replacement disc.

we live and learn eh :thumbup
 
wonder if you guys did what i did yesterday and wind out that threaded pin which goes into the rear brake piston, and yippie a decent back brake.
then on the way to the thundersprint today i felt the bike slowing up on its own then before i had chance to do anything the back wheel completly locked up putting about £50 worth of rubber onto the road after a bit of a thinking i realized what had happened and reset the pin thingy then after cleaning up all the red hot fluid that had pissed everywhere i was on my way again,what was really anoying i did not have all the tools in my aprilia tool kit.....But my mate on his Honda did,which he has not shut up about since...:jack
 
ding! ding! ding! We have a winner. I did exactly that, but I only made it a little ways down the street and then it didn't lock but it was hard to roll. I could not leave the litle adjuster alone. I don't have the glaze on my rotor, just got it hot. I adjusted the little screw on the clutch lever yesterday, seems to have done no harm, just let me set the release point.
 
rear brake

What has probably happened is this: You had air in the line (they all have) and when you adjusted the rear brake in order to make it work it was in effect dragging only very slightly, but enough to built-up heat in the system. What happens next is the heat makes the air expand witch in turn apply pressure on the disc via the pads and soon after you either have a severely dragging rear brake or a complete locking of the rear wheel. So, after you will have replace the pads and/or the disc, you will need to bleed the rear caliper witch is very easy but a bit long. Notice the bleeder on the rear caliper is down witch is impossible to properly bleed right as is. What needs to be done is, removing the caliper from is mounting bracket (2 bolts) and pass it in such a way as to have the bleeder higher than the rest of the rear brake line, then wait 10 min or so. The little bubbles of air will slowly migrate to the highest point... then you can just open the bleeder and let the air out, do it 2-3 times to make sure there all out, best to put a piece of flat bar to prevent the pads out and having to pry them apart after the bleeding. Reassemble with loctite (one drop) and end of story no more probs. If I was unclear feel free to ask anything. :thumbup
 
well i already knew what happened which caused my stupid adjustment to burn out the rear brake, didnt use loctite after bleeding though and i tend to prefer 'reverse bleeding' or whatever you want to call it, where you force fluid up through the bottom and it seems to get the lil bubbles out easier (probably as the fluid moves the same way bubbles wanting to go..) though you still have to bleed the calliper in similar fashion to that mentioned above...

doug, i have tried messing with the clutch lever span to (it doesnt work in the same way as the rear push rod we seemed to have too much fun adjusting) and found it was a bloody nightmare in heavy traffic at slow speeds! This bike just doesnt like to slowly slip the clutch all the way out... not to me anyway, the clutch sucks compared to the one on my lil 50 which happily slips all the way out at full throttle

when i discovered my adjustment gave me not just a functional rear brake but a really sharp one i went for a good long ride in the hot summers sun, even managed a wheelie, though it did come down a bit harder than normal hehe :biggrin then about a mile later on a big fast road (one of the main routes into lincoln actually..) i had to slow for a truck infront waiting to turn right, made an awful noise and wouldnt stop slowing down, then i was stuck... n i mean no matter what i did i could not move the bike off the road (despite being right next to a damn layby) lets just say it took a bit of persauding and more than a bit of melted skin before i got free, i had all the tools i needed, except i used a cable tie to hold the belly pan together where i had lost a bolt, and of course i didnt think i would need to carry something to cut it with.. stupid me

oh well hopefully others will learn from our mistakes and not over adjust the push rod, for the record there needs to be at least a small amount of movement before the push rod actually applies pressure in the master cylinder (you can move the brake lever with your hand and feel if there is a little freeplay in the rod)
 
Actually managed to get some air out of my back brake the other day by just placing the caliper on top of the disc, after removing the plastic protective strip under the swingarm. Last time I bled it I had to hold the caliper above the seat to get the air out!
 
Note that if you take the spring off of the pedal, you can easily set in the 4mm of free play someone recommended. Then put the spring back and you are golden!
 
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