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Rs125 Master Cylinder

Printed From: rsvr.net Forums
Category: General Chat
Forum Name: Technical info
Forum Description: Part numbers and sources for all Aprilia models.
URL: http://www.rsvr.net/forum_posts.asp?TID=27761
Printed Date: 27 Mar 2026 at 02:26
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Topic: Rs125 Master Cylinder
Posted By: Scotty97
Subject: Rs125 Master Cylinder
Date Posted: 29 Apr 2019 at 21:30
Hi

Looking for some help with my pre 2005 Rs125 front master cylinder.

I removed the lever, as it was snapped, and I could pull out the piston/plunger out of the body of the master cylinder.

There was no circlip holding in in place, and I can’t see a groove for the circlip??

Should one be fitted?

Also, I cannot find a rebuild kit for the master cylinder, is there anywhere I can get replacement seals?

Thanks for any info



Replies:
Posted By: rsvwalt
Date Posted: 30 Apr 2019 at 11:34
Have a glance at the parts pictures on  Fowler or ask AP


Posted By: rsvwalt
Date Posted: 30 Apr 2019 at 11:37
Try this.
https://www.fowlersparts.co.uk/parts/5693227/rs-125-2t-rs-125-2t-rs-125-chassis-number-prefix-zd4sf0-zd4sfa-zd4sff-zd4sfg-zd4mpb-1999-2005-rs-125-chassis-number-prefix-zd4sf/rh-controls" rel="nofollow - https://www.fowlersparts.co.uk/parts/5693227/rs-125-2t-rs-125-2t-rs-125-chassis-number-prefix-zd4sf0-zd4sfa-zd4sff-zd4sfg-zd4mpb-1999-2005-rs-125-chassis-number-prefix-zd4sf/rh-controls


Posted By: Scotty97
Date Posted: 30 Apr 2019 at 12:06
Hi thanks for info

I’ve had a look at this, but it doesn’t show the internal parts of the master cylinder?

And their rebuild kit is no longer available


Posted By: Stevex
Date Posted: 30 Apr 2019 at 18:08
I've rebuilt Brembo MCs before and the piston is sealed to keep the fluid in and the outer rubber dust seal has a metal outer ring that is an interference fit that keeps it in place.
Try these people, if anyone can help you, hopefully these can.
https://www.powerhouse.uk/content/motorcycle-brakes/motorcycle-brake-caliper-services.php" rel="nofollow - https://www.powerhouse.uk/content/motorcycle-brakes/motorcycle-brake-caliper-services.php


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People say I don't know Jack Sh1t; but I do, he lives next door.


Posted By: arran
Date Posted: 30 Apr 2019 at 18:32
+1 for powerhouse


Posted By: Scotty97
Date Posted: 30 Apr 2019 at 20:29
Thanks

I’ll have a closer look tomorrow and check the fit of the dust seal


Posted By: Scotty97
Date Posted: 03 May 2019 at 10:43
Here’s a picture of my master cylinder? Seals seem ok, maybe a little flat, but defo no circlip



Posted By: Scotty97
Date Posted: 03 May 2019 at 10:44


Posted By: Scotty97
Date Posted: 03 May 2019 at 10:44
Sorry, anyone know how to post pics of iphone



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