Topic: front caliper swing adjustment

[evinrude7]

can't seem to get the front caliper to swing away from having the static pad rub on the rotor.  i had the front end apart last week to service the forks and change out some fork boots.  when i loosen the adjuster screw that has the spring and nut on it, the screw comes loose from it's place without the caliper adjusting/swinging.  the little swing arm is lubed.   

[BomberMann650]

The big bolt thru the armature is slotted.  Turn that.

[evinrude7]

The big bolt thru the armature is slotted.  Turn that.

Big bolt thru the armature? Isn't that what I'm referring to?

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[BomberMann650]

my 550 had a little slot under the exterior locknut.  Couldn't budge it.  The slot on the interior did turn.
If you have tried that already, and you're still SOL.  I'm 'fraid its time for pics.

[evinrude7]

my 550 had a little slot under the exterior locknut.  Couldn't budge it.  The slot on the interior did turn.
If you have tried that already, and you're still SOL.  I'm 'fraid its time for pics.

pics.  pointing to both sides of same bolt/screw.  caliper won't swing away from rotor towards spokes.  static pad rubs and squeaks.  do i need to completely remove the screw.  set the caliper in the right place.  run the screw thru both making sure to keep the proper distance?  are both holes threaded? 

[TwoTired]

Step one is to get the caliper piston retracted a little bit  Turn the adjuster screw to allow that when you push with the palm of your hand on the caliper body.  Should see the gap between piston pad and disc.
Next adjust the screw so that you have 6 thou clearance between disk and stationary pad, and then use jam nut to lock the setting.
The front wheel should now spin freely.
Press the brake lever to push the piston pad back into contact, and release.

The wheel should again turn freely.  If not, you have piston retraction issues usually associated with the piston seal (it also provides piston retraction force).

Pitted piston, improper seal lube, or caliper grove is not cleaned properly.  That square section seal is forced into an angled shape.  Its attempt to return to square is what retracts the piston and then allows the stationary pad spring to pull its pad back, too.

Cheers,

[evinrude7]

Step one is to get the caliper piston retracted a little bit  Turn the adjuster screw to allow that when you push with the palm of your hand on the caliper body.  Should see the gap between piston pad and disc.
Next adjust the screw so that you have 6 thou clearance between disk and stationary pad, and then use jam nut to lock the setting.
The front wheel should now spin freely.
Press the brake lever to push the piston pad back into contact, and release.

The wheel should again turn freely.  If not, you have piston retraction issues usually associated with the piston seal (it also provides piston retraction force).

Pitted piston, improper seal lube, or caliper grove is not cleaned properly.  That square section seal is forced into an angled shape.  Its attempt to return to square is what retracts the piston and then allows the stationary pad spring to pull its pad back, too.

Cheers,

Thanks for the reminder about sticking the feeler gauge in there TT.  Working fine now. I thought I forgot a step.

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