I just rebuild the front calipers on my 84 650 last summer. Bought new pads and rebuld kits. They wouldn't release the rotor and I couldn't move my bike. They were so stuck, I had to use the brake line and pump the handle to get the pistons out. Too forever and was a real mess. Be prepared for anything when it comes to brakes and rebuilding calipers. I hope I never have to do that again.
On Feb 10, 4:37 pm, stanley/ Randolph <[email protected]> wrote: > Wrong term, I guess. I have a slightly sticking caliper, and noticed that it > was difficult for it to push the pads back. Of course, I perceived it as > slight warpage but it only happened when I first used the front brake on my > 450. After riding a minute or so it the slight squeak of the pad rubbing > stopped, until I applied the front brake again. So the caliper was slow > retracting, I figure, and the slight off-center was, I surmised, to push the > pads back away from the rotor. > It has only 10,000 miles on it, but I think it sat a good while, because the > usual carb problem evidenced itself, only mildly, upon initial cold start. > Acetone took care of most of it, but still a very slight hesitation > before/during warmup if the choke is not at least partially engaged. > I haven't ridden in a while and last time I took it for a spin, just around > the storage complex, the front caliper stuck and wouldn't come loose again, > clamping down more the warmer it got as it dragged. It does release after > it cools down, but acts up again if I use the front brake. > I will have to do some teardown of my own, to clean and re-seal a caliper... > BTW the disc is clean, smooth, and no discoloration. > > Stanley > > > > > --- On Mon, 2/8/10, Dennis Hammerl <[email protected]> wrote: > > From: Dennis Hammerl <[email protected]> > Subject: Re: [Nighthawk Lovers] stuck brake caliper 82 750 > To: [email protected] > Date: Monday, February 8, 2010, 9:48 PM > > Warp on the pads ? Shouldn't be. The rotors have a "wave" of +/-- .005" The > machine that grinds them is a real trip, computer operated and all. The > calipers "float" and will "follow" the wave when the brakes are applied. Once > the brakes are released, the wave bats the pads away and the pads spend very > little time in contact with the spinning rotor. When a bike emits a pulsed > brake squeal, the calipers have gotten stuck and don't float anymore. The > 70's bikes had a pivoted arm for the caliper and used single piston brakes. > Once they started to use longer pads and double piston calipers, they went to > a sliding sleeve setup so the pads would stay parallel. Pivots, sleeves, all > can rust up. > I had a Wing owner give me a ration over his "warped" rotor. (Rear of course, > most Wing owners don't use the front brakes) He went to turn it (scarred from > abuse) and noticed the warp (duh... in a lathe, sure you can) He proceeded to > turn it flat. By the time he had a complete pass on one side, it was below > minimum thickness. I got the last laugh. He had an Aspencade with ventilated > rotors. $270 to replace. Tough darts.. > > From: stanley/ Randolph <[email protected]> > To: [email protected] > Sent: Mon, February 8, 2010 12:25:08 PM > Subject: Re: [Nighthawk Lovers] stuck brake caliper 82 750 > > That is most excellent to know. I noticed the warp on the pads of my 450, > and wondered about it, thinking it might be something like that. > > Stanley > > --- On Sun, 2/7/10, Dennis Hammerl <[email protected]> wrote: > > From: Dennis Hammerl <[email protected]> > Subject: Re: [Nighthawk Lovers] stuck brake caliper 82 750 > To: [email protected] > Date: Sunday, February 7, 2010, 2:07 PM > > Rotors can not be turned(#). Replace only. Rebuild caliper/s as needed. > Aftermarket pads can be better than OEM. Please avoid sintered metallic pads. > The OEM are sintered and cause huge wear. > > # Rotors are not flat, turning them makes them flat and end result is below > minimum spec thickness. Rotors have a deliberate warp to make pads retract > and not drag. Very different from auto think. Calipers "float" and track the > warp without problems. > > From: mongoose22p <[email protected]> > To: Nighthawk Motorcycle Lovers! <[email protected]> > Sent: Sun, February 7, 2010 2:36:20 PM > Subject: [Nighthawk Lovers] stuck brake caliper 82 750 > > yes i need some help with my bike the brake caliper on 750 82 it has > 30.000 miles and it chewed up my right side rotor pretty bad can they > be turned like a car i dont know anything about it is it brake shoes > that have it stuck previous owner must have rode it with it stuck to > tear up rotor i have replacement i bought 2 on ebay should i change > both rotors or just bad one should i change pads if so what kind > should i get is caliper bad or just stuck what usually happens thanks > steve > > -- > You received this message because you are subscribed to the Google Groups > "Nighthawk Motorcycle Lovers!" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group > athttp://groups.google.com/group/nighthawk_lovers?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "Nighthawk Motorcycle Lovers!" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group > athttp://groups.google.com/group/nighthawk_lovers?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "Nighthawk Motorcycle Lovers!" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group > athttp://groups.google.com/group/nighthawk_lovers?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "Nighthawk Motorcycle Lovers!" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group > athttp://groups.google.com/group/nighthawk_lovers?hl=en. -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. 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