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Old 04-29-2009, 11:11 AM
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master cylinder rebuild kit

hi guys!
i have a Reybestos master cylinder rebuild kit (precisly: Raybestos MK1737) for my 81 k5 blazer, but i have a doubt about the 3 seals inside the package.
2 of them are similar, the other one is different but before keep out master cylinder, i'd like to know where i must to install them.

i don't know if i must use them to replace old seals on the secondary piston or i must install them between reservoir assembly and master cylinder.

surely i could remove master cylinder and check out the correct position, but maybe it's better to know before ???

someone can help me please?
thanks
Fabio

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Old 04-29-2009, 11:29 AM
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There's an exploded view of a generic M/C HERE. You might want to look at the whole article from the beginning, it's basic but seems to cover everything that's needed.

There's also a section on bench bleeding the M/C- something that is often overlooked, but is necessary- that is also shown in the article, before the page that shows the exploded view.

A section on bleeding follows the diagram, but IIRC, you've already been through all that!

Hope this helps.
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Old 04-29-2009, 11:49 AM
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ehy Cobalt! how's going?! i hope everything is good for you!

great pic! my master cylinder is the second pic
is it possible that I have only primary seal and reservoir grommets? (as in the picture)
2 identical seals and 1 different? the only possible combination
i don't know what usually dealers put inside rebuild kit

what do you think cobalt?
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Old 04-29-2009, 12:36 PM
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Some of the aluminum master cylinders from GM trucks in the late '80s early 90s were known for the aluminum corroding badly in the bore. Check the bore carefully for pits before you assemble it with new parts or your rebuild will be short lived.

Later, mikey
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Old 04-29-2009, 12:50 PM
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ok guys! i re-checked reservoir assembly and now i'm sure that in my master cylinder rebuild kit there are NOT grommets of reservoir.

one of two grommets is broken and where i can find them now?!?!

there is anyone who can send?
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Old 04-29-2009, 03:09 PM
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Quote:
ehy Cobalt! how's going?!
Things are well here, thanks.

Quote:
there are NOT grommets of reservoir.
That's a real bummer that the kit didn't include those.

When you last were having the difficulties bleeding the rears (stuck bleeder valve), you had also mentioned seepage at those seals.

I had looked then- and I did not see anyone who had the reservoir grommets.

If I locate anyone who has them, i"ll let you know.
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Old 04-30-2009, 10:12 AM
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iinfact i had a doubt about these seals so i asked to an italian dealers and he confirmed that in the package there were seals too. unluckly the purchase was done online and I could not check.

today i found an used seal. good condition. i hope the other one is good too.
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Old 04-30-2009, 10:49 AM
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I called a couple of the brake rebuilding places that I deal with , (power brake exchange) and was told about the only way to get those grommets new is to buy a reservior kit from the dealer. Comes with the grommets and cap.

I called an online GM parts dealer in Texas, they said they'd need the vin# to get the proper part #. They also said they would ship internationally.

Here is their contact page.

http://www.gm-parts-dealer.com/contactus.htm

I'm sure there are a bunch more, I just tried the first one that came up on google.

Hope this helps, later, mikey
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Old 04-30-2009, 11:14 AM
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The last time I rebuilt a master cylinder was a while ago- on a Mazda. That kit had them, possibly it being GM or the time involved makes the difference.
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Old 04-30-2009, 11:26 AM
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Quote:
Originally Posted by cobalt327
The last time I rebuilt a master cylinder was a while ago- on a Mazda. That kit had them, possibly it being GM or the time involved makes the difference.
The guy at Power Brake exchange said it's been a few years since those grommets came with the kits, and only the internals come with them now.

Typical case of raise the price and give you less stuff.

Later, mikey
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Old 04-30-2009, 11:38 AM
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Quote:
Originally Posted by powerrodsmike
ypical case of raise the price and give you less stuff.
Thanks for the clarification, it figures.
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Old 04-30-2009, 12:39 PM
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incredible...listen me guys!
i removed master cylinder, found an used seal but good, removed plastic reservoir assembly and.....

S**T!!! inside the first of two holes of master cylinder, where reservoir is connected, i saw a little piece of plastic, like a piston.

it works up and down and not as primary and secondary pistons.
over this little plastic piston there was a broken metal O-ring.

another problem!!!!!!!
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Old 04-30-2009, 01:16 PM
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That is the quick take up valve, you probably have a step bore master cylinder...

Here is a pic from my Raybestos brake service manual...



It says that valve can't be replaced....

Did you ever consider a new master cylinder? Is that MC aluminum? Note that you can not hone those, as it will remove the anodizing in the bore...

Later, mikey
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Old 04-30-2009, 05:29 PM
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in todays market, M/C are failry cheap and readily avaliable.

the only problem i have is when i go to buy a new master, often i get one that does not work properly!!
ive had this problem on 4 vehicles..

one question for you...

are you mechanically inclined enough to not screw up on something that people on the assembly lines can only get right 75% of the time?
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Old 04-30-2009, 11:38 PM
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I'll volunteer to go to Napa and pick up a good rebuild and ship it if you can't find the master cylinder there. I believe I have a spare to use as a core. Let me know if you need help.
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