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Brake fluid coming thru the brake differential switch

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easauto Avatar
easauto STEVE CONNOLLY
MILLERSVILLE, MD, USA   USA
The switch that is on the brake differential switch has brake fluid coming up thru it. Bought a new one and now have some pressure back but still have fluid coming up thru it.

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LFMTR4 Lou Mijares
Scottsboro, AL, USA   USA
Steve, this will help you understand what the PDWA switch does. Pretty simple really and rebuildable.

https://static1.squarespace.com/static/5c6dec53b10f25d4edf0b3f7/t/5c6ee9289b747a3de8736cae/1550772521053/Overhauling+Master+Cylinder+%26+PDWA.pdf

Unusual that you would have two fail the same way.

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DerbyRam54 Neville Wardle
Branford, CT, USA   USA
The switch is unlikely to be the source of the problem. Fluid is leaking past the seals on the pistons or shuttles inside the assembly. There were a couple of different types of PDWA but the principle is the same, there shouldn't be any fluid in the central area where the switch plunger is.

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barry s Silver Member Barry Stoll
Alexandria, VA, USA   USA
1972 MG MGB GT
1974 MG MGB
1976 Triumph TR6
1980 MG MGB
The "switch" is just that. An on or off toggle switch. The PDWA
PDWA contains this shuttle

PDWA shuttle

If fluid is leaking out thru the switch port, one or the other O-rings on the shuttle has failed.

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ed.h Ed Hollingsworth
Omaha, NE, USA   USA
Yes. The hole where the switch goes should be dry. If it isn't, something is worn or busted. Hopefully just the seals.

Ed

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easauto STEVE CONNOLLY
MILLERSVILLE, MD, USA   USA
Thanks for your help, I actually have a rebuild kit to use.

Steve

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