Brake and shake

I have a problem with my 83 GPz 1100 A1.
When I`m using my front brake, the fork and front wheel starts moving in the length direction.
The front wheel moves about one half inch when guite hard braking.

I have changed the master pump piston and gaskets after the brake pads was "hanging on" the
rotors last summer. Master pump and calipers seems to work properly.
Rotors cleaned with brake cleaner, and the wheel is easy to spin by hand.

There is still å very little slack in the fork after changing the seals and bushings last year.
Bearings at steering stem are ok and tight.

New sintered brake pads last summer, new brake fluid, new wheel bearings.
Can`t feel any vibration im the brake handle.

Anyone who has a good idea about this "braking and shaking" ??

Did you replace the fluid seals and dust seals in the calipers ?

No, did nothing else with the calipers than replace the dust sealing and friction rubber on the bolt, after cleaning and
lubricate the bolts. Pistons move easily. Same does the calipers sideways.

did you put the speedometer drive behind the circlip for the wheel bearing?

donthaveakawman wrote: did you put the speedometer drive behind the circlip for the wheel bearing?

Can,t remember, but suppose I put it on the right side of the circlip, how would that make any matter when braking ?

the wheel bearing may be offset or the axle may be bent. If take the axle to a shop and have them see if it is straight, even a slight offset could cause a problem.

The brake discs are drilled in an assymetric pattern, is there a special relation between the two discs ?
I had them off last year and did'nt see how they were assembled, except from left /right and inside/outsie.

I don't know how your caliper is set up but on a 78 kz1000 this is what it looks like



I rebuilt just about everything on my chassis last year except the front caliper and it gave me a little trouble for a while shuttering kind of like what you are talking about when I used the front brake .

My fork seals,brake pads and wheel bearings have been replaced so all that is left to change is the old rubber brake parts, inexpensive stuff.

# 3 - O rings (4)
# 4 - dust covers (4)
# 13 - dust seal (1)
# 14 - fluid seal (1)

The problem went away but I am sure it was related to these parts being original and they need to be replaced, parts ordered.

take out the caliper pins and put some synthetic caliper grease under the pins just a little under the ones with the rubber stoppers.

If fork is moving front-rear when you brake Id jack up front of bike and check steering head bearings first with weight off front end

I've found wats wrong, the left caliper was loose in both of the fasten bolts... :blush: :blush: :blush:

Tightened the bolts and problem fixed.

And that's how you fix your bike.Look for loose parts first before tearing the whole thing appart.