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Yes, there is no such thing as clutch fluid. It's all brake fluid.
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When you depress the clutch pedal all the way down the clutch brake stops the input shaft from rotating. This allows the transmission to be put in gear. Never depress the clutch fully ( all the way to the floor) when the truck is moving in any gear. The clutch brake is about the size of a compact disc and cannot stop the input shaft when the truck is moving in gear. This will destroy the clutch brake.
It uses brake fluid in the brake fluid reservoir. The clutch fluid (brake fluid) is fed by the brake fluid reservoir. The clutch fluid reservoir is just beneath the brake fluid reservoir. So, add fluid to the brake fluid reservoir to fill the clutch fluid, also.
Brake, emergency brake and the clutch
Modern Class 8 trucks have no more pedals than a passenger car. If it's a manual shift truck, there's a clutch pedal, brake pedal, and accelerator pedal. If it's a fully automated, clutch free automatic, there's a brake and an accelerator pedal.
You ONLY use the clutch brake when you're at a complete stop.
Brake Fluid Dot 3 Note: Brake and Clutch fluid are the same
The clutch does not use oil, it uses DOT3 brake fluid. The clutch cylinder gets its brake fluid from the brake cylinder and is directly below it. Add fluid to the master brake cyliinder reservoir.
The clutch uses DOT 3 or 4 brake fluid, and shares the reservoir with the brake system. The brake fluid reservoir is the same as the clutch fluid reservoir.
The clutch fluid on all Escorts uses brake fluid from the brake fluid reservoir. The clutch master cylinder is just below the brake fluid master cylinder and is fed fluid from it. Make sure it doesn't run dry or you'll have to bleed the brakes.