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Rebuilt my M105 master cyl on Sunday - some tips

Trango

Member
735
23
18
Location
Boulder, CO
Hi guys, I just wanted to report back on finally rebuilding my air over hydraulic cylinder on my trailer. It took about 30 minutes, plus 30 minutes to debug and bleed.

A few hints:

A small cylinder hone would have been helpful to resurface the bore of the fluid cylinder, and also, make sure you make a reference mark on both sides of the air diaphragm housing, since indexing it is critical to make sure the air line mounting bibb gets back in the right place.

On the assembly:

There is a boot that extends over the rod that serves as the mechanical interface between diaphram and hydraulic master. Put that boot on as your very last step. First, put that boot over the small holder (looks like a spacer with a race machined in it) that slips over the rod. Then, put it on the cast master cyl itself. Only slip it onto the push rod as the last step.

When you have everything together, before you reconnect the brake line, put a little bit of brake fluid into the works to lube everything, and then cycle the air. If you can't see the piston moving through the feed hole from the reservoir, take everything apart then, so you don't have to try to recapture all of the brake fluid you just poured into the cyl (like I did!).

Anyway, this was very easy, all in all.

Bob
 

Trango

Member
735
23
18
Location
Boulder, CO
nickd said:
Where did you get the rebuild kits? Did you rebuild the air side also? Did you work on the wheel cylinders also? I purchased new from Saturn and the new ones in Gov't packing do not have new bleeder valves. Any ideas on where to get them?
Hi Nick,

Yep, I bought the rebuild kit from saturn, but it did not contain the rubber diaphragm or the pushrod. It did, however, have pretty much everything else needed to do the rebuild, including every replaceable part on the hydraulic side.

I didn't work on the wheel cylinders at all, because they work and this was just a mission to R and R the nonfunctional parts. :) For bleeder screws, try any well-stocked auto parts supply house.

Hope this helps,
Bob
 

jonesal

Mission Specialist
Steel Soldiers Supporter
413
69
28
Location
Brookings, SD
Mike,

My master and air diaphragm seems to be held together with something that is spring loaded. I can separate the two about 1/8" and they come back together. Is there anything between the two that needs to be released for disassembly? My master is pretty gunky and I want to overhaul it. I've read the TM and searched the posts but no mention of this.

Thanks,
Allen
 
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