Rebuild Master Cylinder or just buy a new one?

edmond

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I have a '78 XS650, and the front brake master cylinder is all corroded from sitting for 10+ years. The reservoir has leaked the fluid around the brake lever and master cylinder area, and as such do not work. I think the caliper is good, but I am planning to rebuild it. The question is, should I rebuild my master cylinder and possibly take 2-4 hrs away, or just order something like this: ebay and spend the $30 for new levers?

Can someone check if that eBay lever set is good/compatible for the XS with the mirror mount and brake light? Will I need any extra wiring modifications if I use this product?

Thanks,
Eddie
 

jpdevol

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The mirror mounts should be ok. The current asian-sourced master cylinders vary batch to batch (esp. $30 variety) and lever fitment with anything other than what it comes with is problematic. Typical chinese-produced scenario; might look the same, but it ain't. Brake switch connection will be two flat male spade posts (5mm IIRC)
 

gggGary

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Couple points.
The front brake as delivered didn't have very good feel, it took a lot of squeeze to get a hard stop.
I and many on here have replaced the 14mm stock master cylinder with a 10 or 11mm master cylinder for better (and more in step with modern) brake feel. A stainless brake line must be part of that change but a new brake line is always needed anyways.
 

BluzPlayer

My CryBaby Pedal is my Favorite...
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Welcome to the forum @edmond !
This is the best spot on the web for all things xs650. There are members here that know more about these bikes than those that built them. It is always a good idea to ask the forum to help resolve issues or modifications for your bike. They can usually save you time and money. I would recommend reaching out before purchasing any parts as well. Some vendors sell better products and some sell inferior products depending on what the parts are. The forum can give you great advice based on community experience to aid your decision making. There is also a fantastic amount of knowledge in the technical section of the site that can be very informative and includes tutorials by members to walk you through many common issues. Lastly the community LOVES pics. There are several eagle eyed members that can spot potential problems and suggest solutions from the pictures alone.
Don't be shy. Most all here are more than willing to help. It is also helpful to tell us a little bit about yourself and your experience with wrenching. Welcome to the madhouse!!!
 
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