front master cylinder rebuild

[scubasteve]

Hello everyone!! I am a newbee to this web site and a proud owner of a 1979 GS750L with only 10,000 miles on it. My problem is how to get the front master cylinder piston out of the master cylinder cup set. It apears that it should just pull right out. So, before I force and break something I thought I would see if anyone has done this before.Many thanks!!:grin:

 

[relic-rider]

With the caliper removed, you can get the piston out by using an air blow attachment on an air compressor. First put a rag in between the piston and caliper body and put on your safety glasses. Apply air pressure to the main inlet hole where the banjo bolt goes. It should "pop" out under about 50-60 psi or so, but you may have to go higher with the pressure if it is stuck. It is very unlikely that you could pull it out by hand. Once every thing is cleaned up, putting it back in by hand is easy. Make sure the dust boot is seated properly, though. It can be a bit tricky.

 

[relic-rider]

Oh, yeah. I forgot my manners, Welcome to the site!

 

[frosty5011]

Hello everyone!! I am a newbee to this web site and a proud owner of a 1979 GS750L with only 10,000 miles on it. My problem is how to get the front master cylinder piston out of the master cylinder cup set. It apears that it should just pull right out. So, before I force and break something I thought I would see if anyone has done this before.Many thanks!!:grin:

There's a little circlip under the rubber boot, you'll have to remove that first. It's probably hidden under a bunch of crud and can't be seen. Clean the area up first with liberal amounts of WD-40 and try to remove the built up crud....you should be able to see it then.

 

[relic-rider]

Well dummy me. I need to read the title first. Master cylinder, not caliper! Sorry.

 

[SabreJim]

When you clean that master cylinder, pay close attention to the small pin size return hole in the resevour. It gets clogged up with rust and gunk causing the caliper to sieze.

 

[frosty5011]

Quote:
Originally Posted by prxbadger

its a little hypocritical tho when you live in a country which you ancestors migrated to. American is not a race in this sense, it is an agreeable collection of foreigners
as satchmo says, isnt this why the natives were shooting arrows at you not so long ago?
so why not ask the indian population how THEY feel about mexicans

Quote:
Originally Posted by prxbadger

doesnt your precious constitution give you the right to bear arms in a situation like this?

This must be a first....a master cylinder tech thread turned political............:shock::-D

(I know...it's part of your signature..lol)

 

[scubasteve]

First, thanks for all the reply's!! Second,I saw the boot and the metal clip that Frosty5011 talked about. Is the boot tucked under the clip or could it be slipped off the end of the piston? And what is the best way to pop the clip off? Thanks again for the quick responses!!!

 

[SabreJim]

The boot will just slip off the end (carefully). the circlip under it, I have removed with 2 very small screw drivers but there is a tool that compresses the cerclip

if its like this
The screwdrivers I used are like the ones you use on glasses and they brake easily but are cheaper then that tool :-D its like using chopstick and carefully getting it out of its grove

 

[ptm]

The right tool for the job...

Right Angled Snap ring Plier Set
http://www.mikesxs.net/mikesxs-tools.php?category_id=7.1 scroll 3/4 of the way down.

 

[SabreJim]

ptm is absolutely right, the way I did it was a pain in the ---