4020 brakes

gostate · Dec 7, 2012

Console 4020. Left brake works fine. Push right brake both wheels lock up. What should I look at?

Tx Jim · Dec 7, 2012

Equalizing valve malfunctioning in the brake valve housing.

WTW · Dec 7, 2012

Each brake valve actuating piston has a mechanical pin that independently open its equalizing valve. The pin controlled by the left actuating piston is stuck in its bore holding that valve open. This valve should be closed when using right brake by itself. Result in both brakes being applied when right brake is only activated. These control pins are located in the top section of the brake valve in an angled bore between the actuating piston. They are about an inch long and 3/16” in diameter.

DONMYEIL · Dec 7, 2012

Rubber boots are cracked letting in dirt and moisture causing the plungers to stick.

4020 brakes

gostate

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Tx Jim

Well-known Member

WTW

Well-known Member

DONMYEIL

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