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I have a 74 F100, 360 auto, 2 wheel drive. Braking system looks all original and am beginning to have problems with power booster/master cylinder. Has factory disc brakes in front. I've read comments about a pin in the master cylinder that is used in the bleeding process. For non disc brakes I start at the wheel furthest from the master cylinder. What is the process with a split system. The brake pedal can never be depressed to the floor. Many thankks
The pin is at the forward end of the valve. The Ford shop manual says that on trucks under 6,800 lbs with the cast iron Kelsey-Hayes valve the pin is pulled outward when bleeding the brakes.
Trucks 6,800 lbs and over got a brass valve made by Weatherhead. The pin on this valve is pushed inwards when bleeding the brakes.
Cast iron K-H valve. Pins gets pulled outwards on this type.
Brass Weatherhead valve. Pin gets pushed inwards on this type.
A few comments to add after the excellent pics and description of how to handle the proportioning valve.
Starting at the farthest wheel when bleeding is good with disc brakes also. Bleeding is a good first diagnostic. With any of the bleeders open the pedal should go most of the way to the floor. That is my experience anyhow.
With a system that looks original, there could be a number of things causing issues in addition to possible air in the system. I like to start with good visual inspection. How do the calipers, pads and rotors look. Any signs of uneven wear or differences left and right? Any leaks? Same thing in the rear after you pull the drums. How do the brake lines look? Any signs of leaks or excess corrosion?
The flexible lines at each front wheel and the rear axle can be hard to evaluate visually. They may look OK outside and be collapsing internally which can cause the brakes to hang up or other problems.
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