Very good, accurate information.
I would add about the line location that the small line goes to the
discs (large reservoir). Disc brakes need less fluid when applied
because the piston moves very little. The disc pads are stay lightly in
contact with the rotor when released so there is almost no piston
movement needed to apply them.
The large line goes to the rear brakes (small reservoir) as the rear
shoes are pulled away from the drum by the return springs and the
pistons in the rear cylinders have farther to move.
--
John "49-50-54-57-79-95" Chevy 3800 Panel
Heather & Joe Way wrote:
>
> Lots of close tries on the brake connection issue, but no complete
> answers that I've seen yet. None of the brake manufacturers, neither
> factory nor OEM suppliers, were consistent about which end of the master
> goes to which end of the car. If you have a proper master cylinder for a
> disk/drum setup, the reservoir will be divided into large and small
> volumes. The front disks are fed from the end with the larger reservoir,
> and the rear drums from the end with the smaller. The larger reservoir
> is a safety feature allowing the pads to wear, which increases the
> volume of fluid required, without running out of fluid. If your master
> does not have different size reservoirs, it's a drum/drum master. You
> can use it, provided the diameter is correct, but be sure there is no
> residual valve under the tube seat to which you connect the front
> brakes, and be *especially* careful to check the fluid level frequently.
>
> On the residual valves, they can go anywhere between the master cylinder
> and the point where the lines split right and left--10lb valve for the
> rear and 2lb for the front, as posted by another. The purpose of the
> rear residual valve is to keep a small amount of pressure on the wheel
> cylinder seals to prevent the entry of air. The purpose of the front
> valve is to prevent siphoning of fluid from the calipers to the
> (low-mounted) master cylinder when the front is high. They can do those
> jobs no matter where they are located.
>
> The adjustable proportioning valve can go anywhere in the rear brake
> line between the master and the point where the line splits to the rear
> wheels. OEM type combination valves as used on later vehicles must of
> course be located close to the master because both lines are routed
> through them.
>
> Joe
> --
> Heather & Joe Way
> Sierra Specialty Automotive
> Brake cylinders sleeved with brass
> Delco alternator One-Wire conversions
> http://www.restoresource.com
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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