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Whats inside my master cylinder?

  • Thread starter Thread starter Derrick_numbers
  • Start date Start date
D

Derrick_numbers

Guest
I just opened the master cylinder up and it was pretty much bone dry. There is also a gunk kinda like Gum all on the bottom. Is there anything inside ths thing besides the fluid or am i missing parts? can i just clean this out and fill it up with brake fluid? Thanks for the info guys!
P1020516.jpg
 
That grey stuff is epoxy putty and likely its stopping a leak. I think you might want to find another master cylinder. It looks a little worse for wear. The fluid is not clean either.

You should also clean you lines and calipers as I'll bet they are nasty too.

Brakes are important, duh, so you need to keep them serviced. Make sure your fluids are changed at least every 2 years, keep the fluid levels up, make sure your calipers are working correctly and your pads are in spec. You never know when you'll really need them.

Clean things up and keep yourself safe.

Cheers,
Spyug
 
Last edited:
Never seen a Suzuki with a screw on cap like that ? Check ebay for a replacement
 
doesnt look good..and did you notice the crack in the cover?? that will let moisture in and brake fluid is like salt in the fact that it actually draws moisture to itself...might be time to lookfor a whole new setup..at least i think i would ..
 
Ditto Spyug. That looks a bit bodged and if I were you I'd find a replacement. What bike by the way - I don't recognise that MC?
 
Its a 79 GS1000 I picked it up for 700 bucks about 2 days ago. Im pretty sure it was rigged up, Im not riding until the brakes are fixed it but it does run pretty decently. Im not sure if that MC is even original. Whats a good price for a new one?
 
Derrick_numbers said:
Its a 79 GS1000 I picked it up for 700 bucks about 2 days ago. Im pretty sure it was rigged up, Im not riding until the brakes are fixed it but it does run pretty decently. Im not sure if that MC is even original. Whats a good price for a new one?
Click to expand...

That's nothing like the original MC, though it's not unusual for people to change them. I can't help you with a price as I'm the other side of the pond and we talk in ?s not $s (and I think we're even tighter than you guys - that's saying something knowing some of the members on this site:D). Original Suzuki won't be cheap though - Ebay might be a good bet for a decent secondhand one (post details up here and the guys will be able to help you). Plus there are several pattern ones around new which look ok - again the guys in the US will have more knowledge about what's available over there.
 
Derrick_numbers said:
Its a 79 GS1000 I picked it up for 700 bucks about 2 days ago. Im pretty sure it was rigged up, Im not riding until the brakes are fixed it but it does run pretty decently. Im not sure if that MC is even original. Whats a good price for a new one?
Click to expand...

You should be able to find a new used one off ebay for $50 or less. It isn't critical to get the same master cylinder as stock since they are basically the same. It is easier to get a similar vintage suzuki so brake light switch works. You need to make sure they fit your handlebar, most likely 7/8 inch and match up number of disks, not sure if your 1000 has twin disks. You can also use modern master cylinders, but be ready to wire in newer style brake switches. Whichever you get, make sure lever that comes with it is in good shape, too often they are selling beat up units that have kissed pavement.
 
Take that POS master off your bike and depost in the nearest trash can. If your bike has dual disc brakes look for a 5/8" (16mm) master, or a 14mm master for a single disc brake.

Used masters are a crap shoot since the aluminum bore is often corroded which means the master is junk. Partsnmore.com sells a couple of different new masters but some of them come with different mirror threading so that can be a pain.

Good luck
 
I see fifty and eighty dollar new M/Cs on Ebay all the time.
Used ones go for nine to twenty dollars.
 
Derek,

What did you and Tom TKENT02 find was going on with that?

.
 
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