- Joined
- Nov 8, 2010
- Messages
- 119
- Reaction score
- 1
- Location
- Choctaw, Oklahoma
- My Car
- 1973 Mach 1
351c 2v
Edelbrock 4bbl, Performer Intake
Ram-Air
Pertronix Electronic Ignition
Now this is a amateur diagnosis but I believe I lost my Master Cylinder Friday night. The pedal, with intermittent and often minimal resistance would push all the way to the floor. As of Saturday morning after the car reached operating temperature there was absolutely no resistance to the pedal. Brakes are in an "on or off" application. So I can push the pedal to the floor and it is a matter of pressure and a difference of about 1/4" that applies (constantly locking the rear passenger drum up) the brakes.
Now for my initial reactions:
I checked the cylinder reservoir and there is fluid present and nearly full.
The two rear drum cylinders are not leaking neither are the connections at the front disks.
I replaced the vacuum check valve (because I can handle 5.99)
On the recommendation of a guy at the cruise night last night, I went over the vacuum booster and all hoses with some water to listen for vacuum leaks but none revealed themselves.
So from what I know. Master Cylinder goes out, the pedal will hit the floor. The master cylinder is on order from NAPA.
What I need to know: How can I test my vacuum booster for proper operation? When I replace the master cylinder will I "know" that it was the issue? Do the brakes become unmanageable when there is no vacuum booster and could these symptoms be a bad booster instead?
Thanks in advance.
Now for my initial reactions:
I checked the cylinder reservoir and there is fluid present and nearly full.
The two rear drum cylinders are not leaking neither are the connections at the front disks.
I replaced the vacuum check valve (because I can handle 5.99)
On the recommendation of a guy at the cruise night last night, I went over the vacuum booster and all hoses with some water to listen for vacuum leaks but none revealed themselves.
So from what I know. Master Cylinder goes out, the pedal will hit the floor. The master cylinder is on order from NAPA.
What I need to know: How can I test my vacuum booster for proper operation? When I replace the master cylinder will I "know" that it was the issue? Do the brakes become unmanageable when there is no vacuum booster and could these symptoms be a bad booster instead?
Thanks in advance.