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Tips On Rebuilding a Typical Master Cylinder


This is a basic guide on how the typical master cylinder comes apart and how to properly rebuild it. Read the entire section before attempting to do a rebuild as it is not set up as a step-by-step instruction manual. It is also based on a Honda GL1100 '83 master cylinder and your actual parts and order of installation may differ slightly for other makes, models, and years. It is meant to show you how this is done so you can determine yourself if you have the skill and/or tools to do this sort of job yourself. We hope you can gain some useful information and ultimately save some money!

1- Tools Needed

Basic tools needed are:

Good quality, long reach snap ring pliers.

#2 Phillips and med size regular screwdrivers

A scribe or ice pic style tool.

Needle Nose Pliers

Silicone spray lube

Brake cleaner or carb cleaner

Various hard bristled round and regular brushes


2- Next familiarize yourself with the master cylinder. Master cylinders consist of two basic parts. The main master cylinder piston workings that could also be called the pump, and the reservoir where the fluid is held. This info can be used for almost any brand of master cylinder and for front or rear styles. Some have remote reservoirs and some have solid reservoirs that are part of the pump body. For our purposes we will be rebuilding a master cylinder from a '83 GL1100. This was chosen due to having the removable reservoir so we could also cover replacing the reservoir too.

3 - Dissasembly

Next we will take the master cylinder apart. It is important in this step to make sure to lay out ALL the parts just as they were removed. Most rebuild kits do not come with any sort of instructions. If the parts are layed out in the order and the direction they were pulled, it will be much easier for the final installation of the new parts.

First thing to remove will be a soft rubber boot that covers the outer part of the pump piston. On our example model it was missing so we added a picture of the new one that will be installed in one of the last steps. Typically it can be just pulled out with your fingers of a pair if needle nose pliers and set aside as the first removed part. That will leave the exposed piston end and then you can see the snap ring that needs to be removed next.

Exposed piston end showing snap ring that holds it in.


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