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Discussion Starter · #1 ·
hi wingers

I've serviced and
painted all the brake calipers today.
i expected to see the same size
pistons in the two front calipers.
the two on the left front are different
sizes to the ones on the right front?
is this correct?

I've never seen this before?
I think the po's might of changed
them?

What worries me is this. When
i brake the caliper with the bigger
pistons will brake harder on one
side. This is dangerous!

Please see the attached photo
of the project bikes front calipers.

Many thanks for your advice brothers!

Regards

Angel
 

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Other side of the pond
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Yes that is the way they should be, because of the linked brake system.
 

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I'm not quite sure, but I think different size pistons is correct, it is to compensate, for the linked brake system.

a manual should be able to help.
 

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Discussion Starter · #4 ·
gl1200 i/state '84 caliper pistons query

hi Ted, OldE

cool bikes you've there.

Ted, I've never seen a wing that
color before. it looks pink to me?
:) what is the color name buddy?


I've never bled a linked brake system
before, is there a logical sequence
to bleeding the calipers?
left first, followed by right, then rear?
there are a few variables? :-(

many thanks for your help!

Angel x
 

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Yes the left caliper is larger, it is controlled by the lever on the handle bar. The right caliper is controlled by the foot brake. Which also controls the rear. No it is not dangerous that is the way it was designed. I myself use the front brake more than the foot. Maybe not to hot on loose stones. R front/ Rear are linked.
The right front is totally separate system used only by the handlebar lever. Speed bleeders are the way to go when I did the 85 I did the rear then the right front. Finished with the left front.
 

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The left front caliper is the front brake and the right front caliper is the rear brake and works in conjunction with the left (the only) rear caliper. Many bikes only have one caliper/rotor on the front wheel, just like your bike only has one caliper on the one side of the rear wheel. There is nothing dangerous about this it is quite normal. If you only use the brake lever only the front left caliper is closed, likewise if you only use the brake pedal then only the front right and rear left calipers are closed.

To bleed the front brakes bleed the front left caliper only. To bleed the clutch bleed the clutch slave cylinder only. To bleed the rear brakes bleed the front right caliper first, then the rear caliper, you do this because the highest part of the rear brake system is the line going to the front right caliper, plus it is also the longest line.
 

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Discussion Starter · #7 ·
gl1200 i/state '84 calipers query

hi wingers!

thanks for your help and advice!

off i go to the garage to bleed
the little critters!

many thanks

Angel
 
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