Brake upgrade, Parking brake |
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Brake upgrade, Parking brake |
Krank |
Jun 22 2011, 10:40 PM
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#1
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Member Group: Members Posts: 140 Joined: 11-October 09 From: Winnipeg, MB Member No.: 10,922 Region Association: Canada |
I have been thinking about doing the beemer front disk brake upgrade. The only thing that bothers me is the loss of the parking /(cough, cough) emergency brake. I had an idea to look for a motorcycle front disk brake rotor mounted to the axleshaft with a cable operated brake assembly mounted to the tranny (I think there are three useable bolts on the RH side). Anyone play with this idea before?
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Eric_Shea |
Jun 23 2011, 10:55 AM
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#2
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PMB Performance Group: Admin Posts: 19,289 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
If your F100 brakes lock up your wheels... their job is done. How could they suck? You would only need a larger contact patch to get better braking once your wheels lock (read: fatter tires).
If you don't know how to drive down a mountain without getting brake fade (in a car that should "never" experience brake fade other than "heavy" track duty) you really shouldn't be driving a 914 down a mountain. (IMG:style_emoticons/default/biggrin.gif) Carrera calipers weigh 9+ frigg'n pounds EACH. I will guarantee you I would "Never" put those on one of my 914's. But wait, it gets better... 24mm Carrera vented rotors add an additional 4lbs. each. Welcome to nearly 20lbs. of additional UNSPRUNG weight to your 2000lb sports car. Guess what, the BMW caliper weighs almost the same! (IMG:style_emoticons/default/biggrin.gif) Upgrade away gang... I'm enjoying the show. (IMG:style_emoticons/default/thumb3d.gif) P.S. My thoughts on "Why"people think they need "upgrades": Most of us enjoy modern cars on a daily basis. The wife has an E500 wagon with excellent brakes. My Cayenne has the largest set of calipers ever thrown on a standard road going Porsche (I found a small pony living in my right front). All of these brake systems are well designed and power assisted. Put your big toe on the pedal and the big car stops... really fast It takes a few minutes to get use to the Cayenne after driving her car... now, imagine getting out of the Cayenne and going to a brake system from 1970, be it their top of the line 1970 914-6/GT model or a lowly (and lovely) 1970 914-4 (which has better brakes than anything in it's class!) Or... plop yourself into a 1970 Ford F-100. THINGS ARE GONNA FEEL DIFFERENT GANG. Does this mean our brakes suck? All things being equal... NO. Your 2000lb 914 can still stop much faster than the 2012 7000lb. Suburban behind you so... keep that in mind. Could they be better? Depends. To me, better means "stopping the car faster" and again, I'll go back to -- "If you can lock up your wheels with your current brakes, the answer is NO." Get bigger tires... you'll stop faster. Get better pads that allow you to modulate your pedal almost as well as an anti-lock devise... you'll stop faster. Learn "how" to brake/modulate and... you'll stop faster Given enough money, time and engineering know-how, I'm sure someone could install my Cayenne calipers on a 914. It still won't stop any faster if the tire is sliding along on the pavement. |
DBCooper |
Jun 23 2011, 07:53 PM
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#3
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14's in the 13's with ATTITUDE Group: Members Posts: 3,079 Joined: 25-August 04 From: Dazed and Confused Member No.: 2,618 Region Association: Northern California |
If your F100 brakes lock up your wheels... their job is done. How could they suck? You would only need a larger contact patch to get better braking once your wheels lock (read: fatter tires). If you don't know how to drive down a mountain without getting brake fade (in a car that should "never" experience brake fade other than "heavy" track duty) you really shouldn't be driving a 914 down a mountain. (IMG:style_emoticons/default/biggrin.gif) Carrera calipers weigh 9+ frigg'n pounds EACH. I will guarantee you I would "Never" put those on one of my 914's. But wait, it gets better... 24mm Carrera vented rotors add an additional 4lbs. each. Welcome to nearly 20lbs. of additional UNSPRUNG weight to your 2000lb sports car. Guess what, the BMW caliper weighs almost the same! (IMG:style_emoticons/default/biggrin.gif) Upgrade away gang... I'm enjoying the show. (IMG:style_emoticons/default/thumb3d.gif) P.S. My thoughts on "Why"people think they need "upgrades": Most of us enjoy modern cars on a daily basis. The wife has an E500 wagon with excellent brakes. My Cayenne has the largest set of calipers ever thrown on a standard road going Porsche (I found a small pony living in my right front). All of these brake systems are well designed and power assisted. Put your big toe on the pedal and the big car stops... really fast It takes a few minutes to get use to the Cayenne after driving her car... now, imagine getting out of the Cayenne and going to a brake system from 1970, be it their top of the line 1970 914-6/GT model or a lowly (and lovely) 1970 914-4 (which has better brakes than anything in it's class!) Or... plop yourself into a 1970 Ford F-100. THINGS ARE GONNA FEEL DIFFERENT GANG. Does this mean our brakes suck? All things being equal... NO. Your 2000lb 914 can still stop much faster than the 2012 7000lb. Suburban behind you so... keep that in mind. Could they be better? Depends. To me, better means "stopping the car faster" and again, I'll go back to -- "If you can lock up your wheels with your current brakes, the answer is NO." Get bigger tires... you'll stop faster. Get better pads that allow you to modulate your pedal almost as well as an anti-lock devise... you'll stop faster. Learn "how" to brake/modulate and... you'll stop faster Given enough money, time and engineering know-how, I'm sure someone could install my Cayenne calipers on a 914. It still won't stop any faster if the tire is sliding along on the pavement. Answer's easy enough, Eric, it's the amount of control the brakes give you. Brakes aren't just full on-full off, any brake can lock the wheels, an F-100 or your 914, so no one doubts maximum capacity. The difference is what's in between, the modulation you alluded to, meaning the amount of control you have over those brakes before they lock up. That's what really separates that old F-150 from your 914, how easy or hard are they to modulate. And of course you learn to modulate, like you learn everything else, but just like most other things some braking systems do it better, others not so good. As an example, have you ridden a modern sports bike, with those two huge rotors up front? Enormous amount of control in those brakes so you can brake right at the limit, carrying the back wheel skittering on the pavement for long distances. Hell, even morons like me can do stoppies on those things! Often successfully! Compare that with my old Bonneville, back in the day. Exactly the same tire patch but no one back then even drempt of doing stoppies. Why? Those brakes were difficult to modulate, control, so nine times out of ten you'd lock up the front before you could get the rear end up. Same tire patch up front, the only difference is the control you get with those modern and "oversized" brakes. The sportbike guys call those brakes as having "long levers", because they're almost squishy, with a long travel between disc contact and locking the wheel. Small master cylinders obviously, combined with very large calipers and discs, two on one wheel. I think that's everyone's goal, not more braking capacity to lock up the wheels, but more braking control before they lock. |
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