thetony
member
Reged: 12/02/2009
Posts: 149
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My '02 Mille's front brakes (pad per piston type brembo)are binding badly (I've crashed coz of this,First time i noticed problem the front locked up on a slippery road and put me on my arse,ouch,now rest of bike sorted)they were filthy as i use the bike every day. After a complete strip down where i'd found some crap behind the dust seals and a little in the fluid seal of 2 r/h pots i've put it all together and the problem persists! No warp on discs, Pads/pistons ok, Bled to perfection. pistons aint retracting enough so after a very short ride the disc expands and locks up wheel-Gotta be old seals? Brembo don't sell seal kits anymore(!?wtf) and i hear they've got importer probs. Dealers so far have been great but come to same dead end-buy new caliper @ £250. PLEASE HELP, We're talking about some bloody o-rings here! Why such an issue? I feel like torching the fucking thing at the moment. Losing faith in Aprilia, not what they need with rsv4 coming soon - I want one but even the dealers say they are in limbo with the factory. Again: HELP
Edited by thetony (12/02/2009 17:53)
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xxrider
Carpal \'Tunnel
Reged: 07/11/2006
Posts: 2561
Loc: Somewhere over the rainbow.......
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Clutching at straws, this, but might save a few quid......
I had the same problem on a Kawasaki many years ago. Front brakes binding so badly that bike was unrideable. I'd manage about half a mile, then the constant friction between pads and disc would cause so much heat that the whole lot would bind SOLID, and the bike would be immovable.
Strip down & clean - no good.
Complete seals and O-ring set - no good.
New discs, new pistons, new calipers - no good.
Several hundred pounds later, I found a peice of tarmac wedged between the brake lever and the master cyclinder piston. Removed, and all OK.
Doh!
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Remember - there are people in the world who are only alive because it's illegal to shoot them.
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thetony
member
Reged: 12/02/2009
Posts: 149
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Yer dead right about 'locking solid' and i will look again at the lever end of the system, although i've had to change the lever since the crash and it seemed spotless in there. Thanks for reply. I've been thinking (getting more pissed off) about the bremo situation though - how the hell can they just stop selling the seal kit!? As it is made of rubber parts, which have a shelf life so therefore are considered perishable. This makes the calliper assembly now a (very expensive)disposable unit unneccessarily. Consumers are not expected to get a new fridge/freezer just because the milk went sour (dramatic generalisation i know)so I am gonna have to start barking up brembos tree. A dealer tells me brembo america nearly went bust when they were held accountabe for selling a seal kit to a guy who fitted it wrongly and was in a bad accident, because of this they have been withdrawn! WTF indeed! Bloody american system fucking it up for the rest of us again. I'd sign a disclaimer happily for a set. Similarly it should be made clear that a brembo system is now technically a sealed unit and throwaway item as such...Any one with a Ducati/Aprilia/BMW/Loads of apparently high end bike TAKE NOTE as this will affect you all at some stage. What a pisser.
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Biggles
Carpal \'Tunnel
Reged: 05/05/2007
Posts: 2939
Loc: Orion arm of the milky way
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Admittedly a long time back, I stripped the brakes on LC350.
The seals were shot. Replacement seals cost £20+ (!!), but wierdly a set of beautifully machines pistons (that included the seals) were just £14.50. Yamaha have a sense of humour in their pricing sometimes.
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Quote me as saying I was miss-quoted.
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thetony
member
Reged: 12/02/2009
Posts: 149
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Here's the latest: Brembo website directed me to AP (the guys that make all that lovely kit and are OWNED by brembo but have nowt to do with them)then to Grand Prix Raceware (not brembos distributer anymore) whom i'd been told should be able to have my calipers reconditioned by brembo as the seals CAN'T be fitted by the general public! - I'm a fucking aircraft mechanic, to put this in some perspective. Eventually spoke to the right distributer who tells me i COULD buy the seal kit,possibly, but only a minimum order of A BLOODY HUNDRED of them! Once again W T F ! Not a realistic option, funnily enough 2 new calipers would be cheaper. He said bugger all about the fantastic reconditioning service.
In Short-the world has now gone mad. Rant over.
Anyway what i'm asking now is... How much free play should there be on the lever? There aint any on mine and someone tells me there should be a little and this could cause the drag. I think the span adjuster is all i've got, so how do you add free play? How much do brake pistons retract (as in mine probably aren't)? What size gap is there meant to be between disc and pad when healthy?
Thanks in advance folks for letting me pick yer collective brains. These forum thingys are well helpful. I'm off to check ebay again just in case it's not the lever end that is the culprit...T
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