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Join Date: Jul 2000
Location: Los Alamos, NM 87544
Posts: 112
Prop valve on BMW conversion

1) Do I have to mess with the prop. valve after converting the front brakes to BMW calipers. Can I leave it as is.

2) What is the best length for the hard brake line to use.

3) Will the BMW calipers clear Riviera wheels.

I read the tech article but was still left with these questions. Any advice will be useful.



One more thing, what is the difference between loaded and unloaded calipers and which ones do I need.


Thanks

Cliff

Last edited by cliff; 11-13-2001 at 02:10 PM..
Old 11-13-2001, 01:38 PM
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I just did this conversion. I used 12" lines. The calipers do not appear to be any worse from a clearance standpoint then the stock calipers. I order my "tee" from Porsche. Dumb, Dumb, Dumb. $22. I got a little anxious when PP said they could not get it so I went straight to the Big House and they said they could get it in three days. Oh well, you live and you learn. Let me know if you have any other questions...I took lots of pics.
JB
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Old 11-13-2001, 02:07 PM
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I did the 19mm master cylinder, and very sticky pads. I can lock up my brakes pretty well now.

DSPTurtle, Are you noticing that much difference with the BMW calipers? I mean, 40% more pad hitting the rotor is a lot, but is it that much of a difference? Maybe I am getting too used to crappy brakes.
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1997 Boxster Spec 2.5, SOLD 1970 914-6 SOLD, 1974 914-4 ...SOLD 1974 914-4 slant nose SOLD
Old 11-21-2001, 08:40 AM
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Getting used to crappy brakes, Seems I get my reaction distance calibrated to one car after awhile. The problem comes when I have been driving the 928 and then jump in the 914. "Little brakes equals long stopping distance". Maybe I should put that sign in my field of view.
Old 11-21-2001, 09:03 AM
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Now that I have the pads bedded in a little better, yes, I am noticing a big difference. At first I was really dissappointed cause it was a lot of work and there seemed to be no difference. But, two things, I am running organic pads and I have not yet removed the Prop valve. I was unwilling to spring for fancy pads until I was sure this worked. The "tee" is on order and when that gets here I am going to move the stock front rotors to the back to experiment. Overall, it has been worth it so far but I believe it will be even better once I get "real" pads and yank out the prop valve. Oh yeah, I have a bottle of "Blue" brake fluid that is going in at the same time.
I want to see what a difference that makes. My objective is to outbrake my 944. I am getting close but not there yet. I will keep you posted.
JB
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Old 11-21-2001, 03:11 PM
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Loaded vs Unloaded Calipers

In the industry, "loaded" means they come with the pads and "unloaded" - you guessed it.
Old 11-21-2001, 10:09 PM
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