Rebuild or buy used?

[wymple]

Apparently my rear master cylinder on my 81 850G is being a problem. I'm wondering if the rebuild kits are worth the trouble. I can buy a used replacement easy enough.

[Nessism]

I'd look inside the bore to see if there is any pitting. If no, I'd order up a factory Suzuki (NOT K&L) master cylinder plunger kit and replace the brake line. If the master cylinder is pitted, I'd buy a used one with a good bore, it may take more than one purchase to find a good one, and then order the new kit for the inside. Last thing I'd do is purchase some used brake master and just blindly install it.

[wymple]

I wan't afraid of a used one because, quite frankly, I've never, ever had a bad rear master on anything. I like the rebuild idea because I like new parts. I will take your advise, tho, for sure. Over at BikeBandit the thing I want listed under OEM would be the cup set?

[Nessism]

Part# 69600-45820 Piston and cup set.

Bike Bandit is expensive. Part Outlaw is cheaper although slower.

[mustangflyr]

Just overhauled my front master cylinder. Found the bore was pitted so I had a brass sleeve put in it. Works great and a permanent fix.

[Sandman900ss]

I'd look inside the bore to see if there is any pitting. If no, I'd order up a factory Suzuki (NOT K&L) master cylinder plunger kit and...

Uh oh. I have one of those kits. You mean it's 2016 and K&L brake kit parts aren't acceptable, don't fit or work? What's the deal? Wouldn't this be known safety issue to them by now? Would appreciate hearing your experience and opinion.

[Nessism]

On two different occasions I've experienced K&L brake caliper piston seals that fit so poorly (too tight) the piston wouldn't move like it should. Also, I had a master cylinder kit where the metal plunger would scrape inside the bore creating drag and create a squeak noise. I was able to save it by chucking up the plunger in my drill press and truing up the plunger and remove some runout using a file but why should anyone have to deal with that? The OEM Suzuki parts are the same price or sometimes cheaper than K&L brake parts anyway.

[chuck hahn]

There is a hole in the bore behind the brass nipple the fluid line from the reivoir hooks to. Take off the nipple and be sure that bleeder hole isnt clogged too.

[Sandman900ss]

Seems like K&L is using a higher quality supplier for their brake master cylinder kits. I just rebuilt my rear master cylinder with the K&L parts kit, and it works smoothly. Parts looked oem, and different than how I remember the old kit parts. Qualified recommendation here...