The 1965 Chevelle was available with or without aptitude brakes.4. Fill the master cylinder with brake fluid. While holding the plastic hoses in the brake fluid in the master cylinder reservoir, use the Phillips screwdriver to push the cylinder in and out slowly until all the air in the master cylinder escapes into the master's reservoir. If the fluid is not clear, but a brownish color, moisture has gotten into the system and the fluid should be drained and replaced. This will save the system from rust and contamination.
1. Loosen the two brake lines on the side of the master cylinder with a wrench. Do not remove the lines yet to prevent leakage of brake fluid. With a 9/16-inch socket and ratchet, remove the two 9/16-inch nuts holding the master cylinder to the firewall or power booster, if they are power brakes.
2. Remove the two brake lines by turning the connectors counterclockwise and pulling the lines out of the orifices in the master cylinder. Pull the master cylinder off the studs and rotate it counterclockwise to prevent the master from leaking out of the holes vacated by the brake lines. Drain the master cylinder of all brake fluid.
3. Install the two plastic brake bleeder hoses into the holes for the brake lines. The bleeder hoses come with the new master cylinder. Remove the master cylinder cap and hold the two hose ends down into the master cylinder reservoir.
The masterly cylinder for jotter brakes differs from the masterly cylinder for ability brakes and is not interchangeable with the crackerjack for power brakes. Both of these master cylinders can be rebuilt with a kit available, which includes all the rubber seals and the piston. On these older vehicles, check the fluid in the master cylinder for contamination.
5. Hold the plastic hoses in the brake fluid in the reservoir while installing the master cylinder on the two studs on the power booster or firewall. Install the two 9/16-inch nuts and tighten with a 9/16-inch socket. Remove one plastic line at a time and thread a brake line into the hole in the master cylinder and tighten with a wrench. Refill the master cylinder reservoir as needed. Place the cap on the master cylinder.