17mm vs 19mm Brake Master Cylinder, again! Options

[87m491]

With the prospect of incoming rotten tomatoes forefront, I wade in here looking for a little BTDT.
Background, just got the 74, 2.0 back on the road after a 7 year hiatus. Over the years,, I did fuel system, brake system (19mm master(ATE) /calipers (PMB rebuilt fronts, stock rears) /rotors/hoses) engine mechanicals and cosmetics.

I haven't driven the car during that time and I only had about 150 miles on it before it came off the road and memory ain't what it used to be.

I did the 19mm MC many years back because it was way less expensive than the 17 and the forum feedback seemed fine. I also have a mid 80's Carrera (with turbo brakes) against which many folks relate the 19mm MC pedal feel. I like a firm pedal and the 911 is pretty easily modulated, heavy but responsive.

Fast forward to this past week and some short shakedown runs. The 914 pedal is "right there" and noticeably firmer than the 911. But while being firmer, the braking is far from commensurate with pedal input. Yes, the 911 pedal is firm, but with the right effort, the car will slow/stop NOW. Been on the track with it no problem. On the 'teener, I feel like I am about to bend/break the pedal and the car seems to barely slow. No way I can lock up these brakes at any road speed, nor do I feel I could lose momentum in a hurried stop situation, even at in town speeds.

I'm wondering if I have missed something or is this type of pedal feel/action is "typical" of the swap? Shamefully, I honestly can't recall if I did pads, but the rotors are spotless and look like they're getting good pad contact but would love any pad advice as well.

[VaccaRabite]

There is weirdness going on for sure.

Is the venting set correct on the rear brakes?

Is there maybe oil or grease contaminating your pads or rotors? Maybe hit everything with a can of brakeclean to make sure nothing is contaminated?

Are your flex lines old? They can collapse in age. Look fine from the outside but are swollen nearly closed on the inside.

Something is wrong. If you have your system fully bled - and it sound like you do - you should be able to lock up your brakes at will.

Zach

[mepstein]

There is weirdness going on for sure.

Is the venting set correct on the rear brakes?

Is there maybe oil or grease contaminating your pads or rotors? Maybe hit everything with a can of brakeclean to make sure nothing is contaminated?

Are your flex lines old? They can collapse in age. Look fine from the outside but are swollen nearly closed on the inside.

Something is wrong. If you have your system fully bled - and it sound like you do - you should be able to lock up your brakes at will.

Zach

(IMG:style_emoticons/default/agree.gif) I’ve had plenty of stock 914’s with stock braking systems that never left me wanting for brakes. The good thing is, it’s a simple system with very few parts. Once you track down the issue, you will be happy with the performance. Don’t give up and definitely replace rubber hoses if you don’t know the last time they were done. Then cut the old ones open and inspect.