Master Cylinder Rod Adjustment

[AMXguy]

My power disk brake master started leaking so I replced it with a new Raybestos one.   the brakes were perefct before this, after installing the new master they still worked great but were VERY touchy you had to be real light on the foot.  so I installed another new one and it's still the same.

Other than the master the only thing I changed was the rod adjustment between the booster and master, I think I have it perfect.  is it possible for this adjustment to cause my touchy brakes?

[Rich G]

That should have nothing to do with it. There should be a little play in the rod so the master cyl can return all the way. Maybe you had a bad brake pedal before and now they work right. Did the new master cyl. have the same bore size as the old one?

[AMXguy]

I tossed the old master before I realized I had a problem, but according to the book I have the correct one.

The only other thing I did was clean up the proportioning valve and put new brake lines on while I was at it.  that shouldn't change anything either from what I see. the plunger in the valve doesn't move but it was that way before, since the brakes worked perfect I didn't want to mess with anything.  that worked out well.

[Kevin71]

I had a mechanic put a new master cylinder in and put two loops in the brake line where is goes into the master cylinder.  He said this would take the harshness out of hitting the brakes.  Or not so sensitive.  Didn't seem to make any difference to me but didn't have problem before.  Has anyone ever heard of this.  He said it whats done on new cars.

[anlauto]

Other than the master the only thing I changed was the rod adjustment between the booster and master, I think I have it perfect.  is it possible for this adjustment to cause my touchy brakes?

YES..of course will make your brake "touchy" if you made the rod longer. Now your brake pedal doesn't have to travel as far to depress the master cylinder.

The Challenger I just restored had a nice firm brake pedal, but it was too "low" for my liking...I adjusted that rod to make it longer and now the pedal is a lot closer to the top and feels much better.

[Chryco Psycho]

the coils in the lines are to prevent cracking like a spring in the line to absorb vibration & flex