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Olds Brake part needed.
hey all, i have a '68 Olds "98" w/ Power Drum brakes front and rear. i need
a proportioning valve or some call it a distribution valve. i can get the one i have rebuilt, but i'd rather find a NOS or used part for a spare. thanks for any leads... mike.......................... |
#2
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On Thu, 25 Mar 2004 21:11:24 GMT, "M&B"
> wrote: >hey all, i have a '68 Olds "98" w/ Power Drum brakes front and rear. i need >a proportioning valve or some call it a distribution valve. i can get the >one i have rebuilt, but i'd rather find a NOS or used part for a spare. > > >thanks for any leads... > > >mike.......................... > ================================== A drum brake car will not have a proportioning valve, which is used only in disc/drum setups. I suspect you have a distribution block with a brake warning switch. These have only two functions, as opposed to the four or five functions in the "combination" valves used in disc/drum cars, although they look a lot alike. It serves as a manifold to distribute fluid, typically having two inputs (front and rear) and three outputs (left front, right front, and rear), and it houses a shuttle piston which is exposed to fluid pressure from the front and rear circuits. If the pressure is equal on both sides, the piston remains centered. If pressure is lost on one side, the piston moves in that direction when pressure is applied to the other side, activating the brake warning lamp on the dashboard. Not counting the switch, the only moving part is the piston. They usually have an o-ring at each end. If the block is made of brass, it will probably need only cleaning and new o-rings to make it as new. Note that common butyl o-rings as available from the parts house or hardware store are not suitable for use in brake fluid. You'll need o-rings made of EPDM, which are available from industrial supply houses. Or if you're close to a clutch & brake supply or a brake parts rebuilder, they might have some. The o-rings used to seal the piston retaining screw on some Mopar master cylinders may be the right size. If it doesn't have a brake warning switch in it, with a terminal for the wire, then it's just a distribution block and has only drilled passages for fluid flow. I don't think the warning lamp was required by DOT in '68, but GM might have gotten a jump on the requirements, so it could be either way. Joe -- Heather & Joe Way Sierra Specialty Automotive Brake cylinders sleeved with brass Gus Wilson Stories http://www.brakecylinder.com |
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