ST1100 front brake master cylinder kit

[jfheath]

OEM parts.

A friend came round with his ST1300 on a trailer a good few years ago. Front brake was locked on solid. First job was to get the bike off the trailer.
We went through everything but found nothing that was casuing the problem.
It was nearly the end of the day when he slipped into the conversation that he had just fitted a new service kit.
We detached the brake lever and the brakes immediately freed up. The service kit he had used was not OEM and the push rod was a fraction longer than it should have been.
My fault. I should have asked - what have you just changed ?

OEM every time. They are expensive, but they save me headaches that can be better put to use for other problems.

 

[Larry Fine]

My fault. I should have asked - what have you just changed ?

Welcome to my world as an electrician on a troubleshooting job.

 

[Corvair]

I ordered an after market rebuild kit for the brake master cylinder, junk. So I ordered an OEM rebuild kit. part # 45330-MA-671. That part # was listed as correct for a 2000 ST1100 NON-ABS. It is not correct. I have owned this bike for at least 10 years and I have to assume I have the original Master Cylinder on the bike. there is no part # stamped on the part. Hoping some one might know the correct part #. Thanks

 

[ST1100Y]

I ordered an after market rebuild kit for the brake master cylinder, junk. So I ordered an OEM rebuild kit. part # 45330-MA-671. That part # was listed as correct for a 2000 ST1100 NON-ABS. It is not correct. I have owned this bike for at least 10 years and I have to assume I have the original Master Cylinder on the bike. there is no part # stamped on the part. Hoping some one might know the correct part #. Thanks

Well, which model do you have?
ST1100Y, '00, non-ABS: P/N 45530-MA4-671
ST1100AY, '00, ABS-II/CBS: P/N 45530-MAJ-G41
You might look it up yourself:

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[Corvair]

Thanks I think I figured it out. Mine is a ST1100 AA. What confused me is that this bike is the Tug for a EZS sidecar and I have to assume the
ABS system was removed when the bike was converted. All three rims were replaced with mag type rims to accommodate 15" steel belted car tires. I also think the brakes may have been linked at one point. Not sure about that but the front calipers are now dedicated to the front wheels. There are independent calipers for the rear wheel and the sidecar wheel. Those two are tied together with the brake pedal. Sorry for the confusion.

 

[ST1100Y]

... EZS sidecar and I have to assume the ABS system was removed when the bike was converted ...

It being a hack leaves the question if/how much of the brake hydraulic are actually still original...

 

[Corvair]

I ordered what I believe is the correct rebuild kit today. I will post if it fits correctly. All ABS components have been removed.

 

[Corvair]

Thanks I think I figured it out. Mine is a ST1100 AA. What confused me is that this bike is the Tug for a EZS sidecar and I have to assume the
ABS system was removed when the bike was converted. All three rims were replaced with mag type rims to accommodate 15" steel belted car tires. I also think the brakes may have been linked at one point. Not sure about that but the front calipers are now dedicated to the front wheels. There are independent calipers for the rear wheel and the sidecar wheel. Those two are tied together with the brake pedal. Sorry for the confusion.

 

[Corvair]

Ok now I am really confused. These are the part numbers I have ordered none of which are correct.
45530MA4-671
45530-MAJ-G41
45530MA4-671
I am going to try to enter a picture of the old piston and seals. There is a possibility this is not the original master cylinder as this bike was converted to a dedicated side car rig. Any help or advice would be greatly appreciated. Thanks Tom

 

[ST1100Y]

There is a possibility this is not the original master cylinder as this bike was converted to a dedicated side car rig.

What I was referring to... the one in the pic does not look like the guts of an ST1100 MC...
Possible that a larger, like a GL1500 MC was installed?
Closeups with the cast numbers on the MC housing, as well as measuring bore and stroke might give some clues (IIRC did one member build a library/spreadsheet about diameter/bore of MC's once...)

 

[Corvair]

What I was referring to... the one in the pic does not look like the guts of an ST1100 MC...
Possible that a larger, like a GL1500 MC was installed?
Closeups with the cast numbers on the MC housing, as well as measuring bore and stroke might give some clues (IIRC did one member build a library/spreadsheet about diameter/bore of MC's once...)

Thanks I’m afraid you might be right. I’ll check the link and post if I can figure this out. Unfortunately EZS has gone out of business. Someone was trying to revive it in Holland but they said no information was available about the previous builders. The calipers are Nisin and the OEM rebuild parts fit as expected. This is a leading link front end and all abs was removed so I assume the master cylinder was replaced at that time. Not familiar with abs. The rear brake and side car are combined and operated solely by the foot pedal. Once again thank you for your help.