M35A2 Brake Master Cylinder

[197thhhc]

so on my m35a2 i disconect the line and take the cap off for brake fluid?

Yes, Fill the res up then recap it. You should check your fluid weekly at the very least. A remote res is a great addition. Welcome to the site.

 

[lippmann_keith@yahoo.com]

master brake resavoir fill

Thanks Bob for the response the military didn't want to make it easy to check the brake fluid did they. I have just purchased a 1970 am general m35a2 its in excellent condition with a 10 ton winch and it also came with a i think m109 1 and half ton trailer it also has the troop heater which i am thinking of selling and also a brand new power steering set up never installed i am not sure what i am doing with this thing but i have wanted one since i was a kid. my wife thinks i am crazy but i love those old trucks!

 

[m-35tom]

does no one ever read the manual??

 

[cbvet]

Sometimes they don't realize how much they need a manual, until they've gotten the truck!

 

[PalmerBS]

Ok, someone help me out here, what does the vent tube do for me? Can i remove it? If so, do i just need to cap off where the vent hooks to the main line down lower?

Basically, the line broke in half close to the top of the master cylinder, and i'm not sure what i need to do???

Help??

 

[Keith_J]

I've always thought the design is poor at best. Given the importance of making sure there is brake fluid in the MC, you would think it would be at least visble from the outside without disassembly. Someone once mentioned that they had ran a rubber hose from the bleeder to a seperate tank that was visible in the cab. Anyone have any pictures of this?

No need for the vent when bleeding the brakes. In fact, skip the pumping with pressure bleeding. Too pricey? Then get the fittings and an air pressure regulator. 10 PSI of air on the master cylinder will quickly bleed the system. Recover the bled fluid to know when to add more to the master cylinder.

 

[Keith_J]

Vent lines are better than the check valve breather in that a vacuum won't form in the case of slight fluid loss. Partial vacuums can prevent proper braking action when they pull the sealing cups away from the pistons. Since this increases the volume of fluid needed to be pumped before the shoes contact the drums, meaning the master cylinder runs out of stroke.

In short, vent lines are safer.

 

[bones1]

Vent line is not needed with a remote reservoir and a vented cap.

 

[PalmerBS]

Given that i'm not ready to get into a reservoir system right now, I guess i just need to replace the broken line?

Does anyone sell them already bent w/ the fittings?

Any other options?

 

[Keith_J]

Given that i'm not ready to get into a reservoir system right now, I guess i just need to replace the broken line?

Does anyone sell them already bent w/ the fittings?

Any other options?

Polyethylene tube with compression fittings works well for this application. It doesn't need to go to the draft tube, that was done for fording kit operation. Routing it to any dry place away from road dirt is better.

Home Depot sells the compression fittings with brass inserts and the poly tube. It is milky-white in color.