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Brake pistons 38mm from which model?

  • Thread starter Thread starter ed56
  • Start date Start date
E

ed56

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I found my GS750 has ~38mm pistons in the front calipers, when the manual says it should be 42,8 mm.

So these calipers seem to come from another model - any idea which?
 
GS calipers came in various types. If you posted up some photos, including some of the pads, that will help us point you in the right direction. Failing that, the OEM parts fishe shows the different calipers, and pads, so you can search out an answer yourself that way. Sounds like you have some later model calipers installed.
 
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@Sharpy, it's the genuine Suzuki workshop manual, see the picture.
 

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This picture shows my calipers, they look precisely like the ones in the manual (and various other sources).

The smaller pistons could have been used in the GS 550 or 400 model.
Unfortunately the workshop manuals of these do not mention the piston diameter as for the 750.

GS_calipers_184023.jpg
 
42.8 mm pistons were fitted in the single disc models and 38 mm pistons in the twin disc models.
 
Cool, thanx.
Makes sense also in terms of hydraulic ratio.

You do not happen to have the part no. of the seal ring (#5 in the sketch)?
 

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Part number is right next to the photo no?

caliper seals.jpg
 
Yes, but the resolution on your pic is a bit too low.
 
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Yes, but the resolution on your pic is a bit to low.

Sorry about that. The photo I tried to post came from the OEM parts fishe from Alpha Sports. There are numerous parts fishe hosts such as Partzilla, Parts Outlaw, Alpha Sports, etc., all of which have the same information. Dual disc model 750 is the 750E model so look up the part information for that model.
 
Ok, that is 69107-05CF0 which supersedes 59107-18410.
Partzilla even shows the size, and it seems to be right: http://ogy.de/gw0q
I'll order this and report again.
 
That' s the right one.

By the way, the rear (double piston) caliper has the same rings, so for an overhaul of all calipers one needs four of them.
 
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