HELP; my rear brake is grabbing.

[imdying]

This is Gisborne.....the parts with take around a week to get here.

No freakin way, NZC overnight, for two seals, from Christchurch, would be <$3.

[kneescraper]

Where is CHCH can I get parts for a RF400...it might be a shit load easer to deal with some one that already knows the parts and where to get them from

[imdying]

There are no parts listings for motorcycle seals, so we work off size. All you need is to measure the outside diameter of the piston. Don't try doing it with the piston in the caliper, it never works out too good. Best way is with some vernier calipers, even if they're $5 plastic ones

The seals will be about $5 each.

[kneescraper]

Oh awesome! I have mitutoyo (sp) cailpers so they should do the job.

[imdying]

If you have a local BNT, they might have them in stock, if you can tell them the sizes.

[kneescraper]

We do have a BNT so I'll check em out!

[kneescraper]

Well I popped the pistons out today, used a air compressor when the calipers were off the bike. So easy to do...had the cailper apart and pistons popped out in 5mins. Im so glad I did this, there was this sticky bright orange crap behind the pistons..I've cleaned that out and at the moment they are sitting in warm soapy water. I will get the new seals on Money...I'll up date once they are back in.

[kneescraper]

After fitting new seals its still doing it, its like the brake fluid isnt retracting from behind the pistons.

Any other suggestions?

[imdying]

Did you clean the master cylinder with anything?

Can you jiggle the rear brake lever at rest? i.e. Has it got obvious play between it and the mcyl pushrod?

Suspend the rear wheel off of the ground. I assume it doesn't spin at all? If that is the case, what happens if you crack the bleeder? Is there any evidence that the system is under pressure? (i.e. fluid comes out at any rate above a dribble) If there is pressure there, by cracking the bleeder open, does that let the wheel spin more freely?

Does is have a constant binding, or does it appear to have particular places it binds?

Is there more to the story that what you've told us? What was your motivation to rebleed it in the first place?

Was the fluid new from a sealed bottle? Any chance you've recontaminated it with something like auto trans fluid?

Went to bleed a friends brakes the other day, he couldn't get a lever no matter how he tried. Looked to me that the caliper mounts were bent... the lever travel was taking the flex is in the system... it was fled, it just would never have worked

[accel_unlimited]

Hey all,


I rode the bike down the road for 5mtrs and the brake disc was so hot you could cook ya dinner on it.

Any suggestions.

Dude, my ovens stuffed. Could i come round and fry up some sausages or something?

[moT]

Hey all,

After a quick clean and rebuild-ish, my rear caliper seems to be grabbing the disc at all times. I did bleed the system with new DOT 4 fluid.

I rode the bike down the road for 5mtrs and the brake disc was so hot you could cook ya dinner on it.

Any suggestions.

yell abuse at it! if that fails attack it with an axe