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My kit arrived yesterday. I need a couple of fittings and I will go to work on the install. I'll let you know the particulars.Rattlehead said:
DOT 3 is hygroscopic, it absorbs water from the air. As you cycle the brakes, brake fluid is pumped in and out of the master cylinder reservoir (particularly with drum brakes). As the brake fluid within the reservoir fluctuates, air is pumped in and out of the reservoir to compensate for the brake fluid level. Water in the air is absorbed by the DOT 3 fluid and contaminates the brake system. Fortunately, most master cylinders since the 70s have a rubber bellows built into the cap. The bellows expands and contracts as the brake fluid level fluctuates thus sealing the brake fluid from the atmosphere and reducing contamination of the brake fluid.oifvet said:
DOT 3 is hydroscopic, and will absorb moisture out of the air. If you look at the lid of your master cylinder of your typical civvy vehicle, you will see it has a rubber diaphram that seals the top of the reservoir. This diaphram will telescope into the reservoir to make up space as your brake fluid level goes down due to increased travel of the pistons/wheel cylinders, while not exposing it to the air. The diaphram is vented on the TOP side to the atmosphere, to allow it to telescope downward.oifvet said:
True, but not in the context of my answer. Disc brakes essentially cycle almost no fluid during a braking cycle. There are usually no retraction springs in a disc brake system, the pads are basically in contact with the rotor at all times. When a disc brake is applied, there is very little fluid displaced. However, the fluid pressure in the caliper increases, causing the pads to grip the rotor more firmly to provide braking action, but with a minimal amount of brake fluid displacement. However, as the brake pads wear over time, enough fluid is displaced to force the caliper brake piston out to compensate for the amount of pad wear.m-35tom said:
Only in a static condition, i.e. brakes not applied, as when you are checking the master cylinder fluid level. Drum brakes displace fluid every time the brakes are applied and released, thus the drum brake reservoir on a combined disc/drum brake system, and the entire reservoir on an all drum system is constantly "breathing". Every time a drum brake system is applied, the brake master cylinder displaces enough brake fluid to extend the pistons in the wheel cylinders to effect a braking action (2 wheel cylinders in a typical disc/drum passenger car system, 6 large wheel cylinders in a typical 3 axle Deuce). The M/C breather vent allows enough air into the M/C reservoir to replace the fluid displaced and then exhausts the air as the brakes are released and the fluid is returned to the reservoir by the action of the return springs on the brake shoes.m-35tom said:
From what I've studied and learned about the deuce master cylinder, that was a "shared" vent location as indicated by Recovery4x4. I did need to purchase a brass plug to put in that block when I removed the vent line. It was a $2.00 part from Advance Auto. Simple enough. I'm big on Grade 8 and stainless steel for replacement hardware on just about everything on the deuce. I used stainless-steel, button-head cap screws, (Allen head), with nylon lock nuts to mount the reservoir to that little bulkhead/panel, so there won't be any concern about "vibra-loose." There is plenty of room in that service area to pour from a small bottle of DOT 5. One of the more simpler jobs I've done on the truck. No cussing at all!dirtyfingernails said:
