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Rebuilding Master Brake Cylinder
- Disassembling and Cleaning the Master Cylinder
- Position cylinder in a vice and begin disassembling.
- Remove boot.
- Drain brake fluid.
- Pop the cylinder apart.
- Remove the main piston, the main seal and the spring.
- Clean your cylinder.
- Begin by using a brake hone tool.
- Place lube on it (brake fluid) and spin it in there easily.
- Go fast at first, then slowly, keeping the stone moving to create a 45-degree crosshatch pattern like you would have on a cylinder bore in an engine.
- Feel in there to make sure all the rust and ridges are gone. Ours felt good, so we were ready to rebuild our master cylinder.
- Rebuilding Master Cylinder
- Start off with your rebuilding kit.
- Lubricate the bore with brake fluid and insert the valve seat into the bore and walk that down in using a bar.
- Assemble bleed back valve on the end of the spring. You will want to use brake fluid here just to keep everything well lubed. Insert the bleed back valve in to bore.
- Next is the main cup seal with a protective brass washer built into the end. That meets up with the next item, a sweep seal. Again, lubricate and install.
- The sweep seal goes in at the end of the bore to sweep out any kind of residue that gets past that main seal.
- Install the clip that holds the system in place.
- The cap and washer then go back on. Leave the cap loose so you can fill the cylinder with break fluid after you install it.
- Put boot back on.
- Note:
These are automotive restoration procedures for Classic Car Restoration. These are general guidelines for restoration procedures on this particular make and model of vehicle, and for the level of restoration selected for this project. There may be variations in procedures depending model, condition of vehicle, level of restoration undertaken and the types of replacement parts or upgrade kits selected. Always follow proper safety Note, and read and follow manufacturer's guidelines, diagrams and safety notices that come with any replacement parts or kit that you select.
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