• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

'77 GS750 brakecomplete rebuild- after market front master cylinder?

  • Thread starter Thread starter Sandman900ss
  • Start date Start date
S

Sandman900ss

Guest
Bike is a 1977 GS750 with the original brake system except for steel lines. I want to rebuild or replace everything: stock single front and rear caliper, and both master cylinders. What are 70's GS owners doing these days? Rebuild kits for the calipers- are oem Suzuki parts the best way to go vs aftermarket (K&L) kits? Don't know if the pistons are good at this point, I have not disassembled the calipers yet.

I realize the rear master cylinder will have to be just rebuilt. The one I'm most concerned with is the front master cylinder- I have had corrosion issues on other 70's bikes and never gotten a good bleed/lever feel after rebuilds with oem parts. There are now a few aftermarket complete master cylinder assemblies available for Honda and Kaws that are less than rebuild kits- are they good, or junk? here's an example: http://4into1.com/replica-kawasaki-complete-brake-master-cylinder-use-on-honda-too-14mm/
 
Disassemble the calipers and masters first to see what needs replaced. If the pistons arent pitted and rusty then all youll need is the new piston seals.

Note that you need to break the bleeders loose to so youre sure they are ok and dont break trying to get them loose. Best be if they seem stuck is to heat the housing area at the bleeders and apply some penetrating oil and let them sit a while and try again.

The seals between the two halves of the rear caliper will need replaced if you break it all the way down. I suggest you do as it makes cleaning the groove the piston seal goes in a lot easier. I use a dremel and one of the brass wire brushes and run that around the groove to remove the scale and crud.

New crush washers are a good idea as well.
As for the masters. If the bores are good and the rubber cups are still supple most times all you need to do is clean the brown scum out and reassemble them. Its usually the scum build up that gets between the cups and the bores and make the masters fail to make pressure.
 
I'm looking for a front MC for the same bike. I'm curious what you decided to go with. Also dealing with a rusty rear MC and planning to rebuild it once I get it opened up. Did you find a part number for the OEM rebuild kit? I've seen a few different part numbers.
 
I picked up a lightly used front MC from a 2008 Kawasaki Ninja 650 for my 1978 GS 750. The bore size is the same as stock, plus it has an adjustable lever. If you don't mind it not looking stock it can be a good low cost option. It does have threads for the mirror too.
Mostly you're looking for a MC with a 5/8" bore, that will fit 7/8" handlebars, there are lots of options out there.

Yes go OEM for brake stuff. If you order from Partsoutlaw and use the BANG code you get free shipping, which is a big plus for ordering OEM stuff. You will need a different banjo to fit if you go with the Kaw MC. Good luck!
 
Last edited:
last we heard the BANG code was no longer in effect. Unless someone knows different but guess you can try it.
 
I just tried it, it took the shipping from $9.99 to $1.00. Not free, but the best shipping deal I know of for any vendor, let alone OEM.
 
Doh! I ordered from PartsOutlaw on Friday night. Called them this morning and said they'd give me free shipping. Better late than never!
 
You must log in or register to reply here.

Similar threads

E
1979 GS850 Front Master Cylinder kits.
Replies
0
Views
35
emlivings
E
LeonAlistar
FYI - Single Caliper MC Rebuild Kit
Replies
0
Views
57
LeonAlistar
LeonAlistar
snoobler
83 GS1100E Front Master Cylinder Options
2
Replies
23
Views
305
mustangflyr!
mustangflyr!
SamLack99
1982 GS750T: Warped Front Disc - Replacement Question...
Replies
17
Views
161
salty_monk
salty_monk
nutz4spd
Front Master Cylinder Replacement
Replies
4
Views
163
Nessism
Nessism
Back
Top