Sponsored Links (Register now to hide all advertisements)
My '50 Coupe did similar. I noticed after short trips the pedal would get hard. Other times, the car would be sluggish. That time, I noticed the brakes were hot. After it cooled off, it was back to normal.
I drove it to the Firehouse to work, about 3 miles. I parked the car and somebody stopped saying the lights were left on. Sure enough the brake lights were on.
Untitled by
Travis Brown, on Flickr
The master cylinder casting was flawed. The hole for the by pass port was spotted but not drilled through. On a Shoebox master cylinder, you can see this port with the cap off. The fluid was clear as the brakes were new.
I was able to drill that hole out through the cap. I did not have to take the cylinder out of the car. It did not take much as the hole was spotted. It's been over 20 years. I cant remember if it was a 1/16 or 1/8 bit.
Clearing that hole did the trick,