Brakes, Stopping with M, A, or S Options

[johnmhudson111]

Coupe of questions about brakes. First of all what is the difference between "M", "A", and "S" capliers? Is it the mounting bolt distance? Early vs.Late? (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif)

Did the 914/6 come with "M" capliers? If not what did they come with? Can these brakes be upgraded to something like the "big reds?

[Eric_Shea]

Jim, those are M-Calipers. Early w/o the spacer. Great shape BTW. Addition: They could be early -4 calipers as well. In photos they're virtually identical. You have to have them side by side to see the small size diff as described in a previous post. Still reading, if it's on a 4-lug rotor it's a -4 caliper.

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So how did you get the 911 M calipers to fit on the rear? Will those fit on the rear with your modified 5 bolt control arms? IF so are those M front Calipers or match M rears?

Sorry for the confusion. "Rear" M-Calipers. They are special for the rear of a 911 and they call them M-Calipers as well. The nose accomodates the hat (Mike, that's why the Front won't fit, the nose rubs on the hat). I'm not sure why they call them M-Calipers as well other than the fact that they may be of "Medium" duty requirements by the standards of the day. If Rich Herzog will weight in here, he had a list of L, M and S meanings... They are different in two outward appearance points, 1) the nose will fit a 911 rear rotor with the tall hat and 2) the fluid lines come in the sides not through the back as witnessed on the photos of Jim's "Front" M-Calipers. (914 calipers... sorry)

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So what would be your preference among these choices? 1. M calipers front and 914 rears with ebrake. 2. M calipers front and 914 front calipers on the rear with no Ebrake. 3. A calipers on the front with M calipers on the rear with no ebrake 4. SC complete front and rear with no ebrake. 5. Complete Carrera fronts and rears with no ebrake.

I don't know the hp you're going to run so I'll number those and add it here:

1. Up to 140hp. If it's 140hp and a track car I would consider #3.
2. No. Too much rear brake. Porsche didn't have that much rear brake until #5 came along in 1984. You'd have issues again.
3. Up to 240-250hp. If it's 240hp and a track car I would consider #5.
4. See #3 (Same system)
5. Up to 300hp. If you're tracking with 300hp I might consider a Boxster Monoblock system.

All of those systems will fit a stock 914 control arm. If I recall (getting old) you were going to have a warmed over 2.0? 2056? I'd stick with #1, keep the handbrake and keep some pocket change. A V-Caliper might be nice just to keep things a bit cooler all around. I tracked my 911 with M-Calipers all day at Las Vegas Motor Speedway, never had fade and drove home that night. I recommend changing fluid after every race (ask Trekkor) (IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif)