- Jul 3, 2015
- Reaction score
- Bradenton, FL
- My Car
- 1973 Mustang Grande, 351C, FMX, coming out of 20 year sleep.
Well, as this old car gets driven more, new problems keep showing up. This is one that I have not yet experienced myself, but a friend of mine has twice now. I got my truck back running, so I put the car off to the side so I could work on it when I had the chance, but a friend's car had some issues, so I loaned him the Mustang while I worked on his car for him. Being I haven't been able to spend much time with it, I have not experienced this, but I'll tell you what I was told. He said that the brake pedal gets very hard and extremely sensitive after driving for awhile and everything is hot. When the car is cold, the brakes work as expected. But as you drive and parts begin to heat up, the pedal gets harder and eventually the lightest touch will almost lock the wheels. Now, I don't claim to be an expert in anything, but usually braking power usually goes down as stuff gets hotter (brake fade and whatnot). I know he's not trying to race the car, he won't even try to race my truck when I tell him have at it, so it's nothing he's doing. If it did it all the time, I would've replaced hoses and gone from there, but since it only does it hot, I'm not too sure where to start out. To my knowledge, it still has the original calipers, wheel cylinders, master cylinder, and brake booster. It does have new hard lines as they're nice and shiny and the old ones were in the trunk, and I would assume the rubber hoses have been replaced. The one time that I did actually check for this was when I was just told it was acting weird and I took it down the street and back with no trouble. Then today, he drove it to work with no problem, but he had to go out of the way for some stuff after and he said it started doing it after about 10 miles or so. Let it cool down and it's back to normal. I'm gonna try to get in and drive it some distance tomorrow, but I don't really know where to look as far as what would be doing this. Any ideas? Thanks for the help.