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> Brakes, Do 914's really stop!
JmuRiz
post Jul 26 2023, 08:47 AM
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QUOTE(VaccaRabite @ Jul 26 2023, 06:26 AM) *

QUOTE(Petepat @ Jul 26 2023, 10:08 AM) *

OK thanks guys, so now I know that a 914 does actually stop it's back to the drawing board with some of your suggestions. Cheers.


Do not remove the proportioning valve. This was common back in the 80-90s and there are still some people that swear by it. I've seen the wreckage that results from the rears locking before the fronts first hand.

When you get it dialed in, the 914 STOPS.

Zach

(IMG:style_emoticons/default/agree.gif)
Yes, I made the mistake of removing the prop valve when I put boxster brakes on the front of mine. That ended up locking the right rear when doing emergency stop drills at an HPDE class. I'll send my old one out to PMB and have it rebuild and reinstall.

The 19 is more pedal effort...it will lock up the front brakes full stock depending on the stickiness of the tires.
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Justinp71
post Jul 26 2023, 09:06 AM
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To answer the title question, I put on wilwood front calipers on 911 3.5" struts and 914-6 rear calipers. With track pads I could go from 100-20 in what felt like 75' it was amazing!

But realistically everything in working order, fresh fluid and good pads they will stop well. I ran Porterfield RS-4 pads with a mild caliper upgrade for years.
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Root_Werks
post Jul 27 2023, 02:34 PM
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As others have said already, a stock 914-4 brake system is plenty of braking power. Something isn't right with your system.

Air in lines most likely
Spongy rubber lines possible
Rubber line internally failed not allowing pressure to caliper(s)

Lots of things could impact braking performance.

(IMG:style_emoticons/default/driving.gif)
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CCE
post Jul 27 2023, 10:34 PM
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Mine had the same feeling, solved after bleeding and some care to the system a second time, it changed a lot. It feels really agile now. (IMG:style_emoticons/default/headbang.gif)

In any case, I had to replace hoses, piston refurb, fluid, pads, rotor grinding, cleaning, bleeding, changing the main piston and such. (IMG:style_emoticons/default/lol-2.gif)

Enjoy the ride
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jhynesrockmtn
post Jul 28 2023, 08:11 AM
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If you don't know the history on your brakes, I'd suggest sending the calipers and pressure relief valve off to PMB for restoration, new MC and new soft lines. Blow out the hard lines or replace if they are rough. Then bleed properly and bed pads properly. They will stop just fine.

I bought a 1970 a few years ago that had sat for years. The rear soft lines were plugged/swollen shut. No fluid moving through them at all. The fronts barely worked.
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Chris H.
post Jul 28 2023, 08:43 AM
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Also recommend the PMB soft lines. They are excellent quality.

Here's the link for 73-76. Not sure what year you have but they have both early and late

Link:

PMB Lines
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Porschef
post Jul 28 2023, 12:14 PM
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Am I missing something??

Why 4 flex lines, I’m kinda sure there are only two up front... (IMG:style_emoticons/default/unsure.gif)
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jhynesrockmtn
post Jul 28 2023, 12:29 PM
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QUOTE(Porschef @ Jul 28 2023, 11:14 AM) *

Am I missing something??

Why 4 flex lines, I’m kinda sure there are only two up front... (IMG:style_emoticons/default/unsure.gif)


You have two in the rear as well. They are kind of a pain to change out with the engine in the car but I've done it.

My rears off my 70.

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Shivers
post Jul 28 2023, 12:30 PM
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QUOTE(Porschef @ Jul 28 2023, 11:14 AM) *

Am I missing something??

Why 4 flex lines, I’m kinda sure there are only two up front... (IMG:style_emoticons/default/unsure.gif)


There are two that go from the chassis to the swing arms. From there it is hard lines
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Porschef
post Jul 28 2023, 01:05 PM
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Jeez, I better up my game. (IMG:style_emoticons/default/sad.gif) I think they were changed not too much prior to when I got the car but who knows if that included the rears...

Thanks (IMG:style_emoticons/default/beerchug.gif)
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Porschef
post Jul 28 2023, 01:10 PM
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You mean like here? (IMG:style_emoticons/default/blink.gif)


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Biggles
post Jul 28 2023, 01:42 PM
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My brakes have been rubbish but i know the rears arent fully working so they are being restored. I'm also putting 5 simple grooves in all 4 discs to de-gas the pads which should also improve things.
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930cabman
post Jul 28 2023, 01:51 PM
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QUOTE(jhynesrockmtn @ Jul 28 2023, 12:29 PM) *

QUOTE(Porschef @ Jul 28 2023, 11:14 AM) *

Am I missing something??

Why 4 flex lines, I’m kinda sure there are only two up front... (IMG:style_emoticons/default/unsure.gif)


You have two in the rear as well. They are kind of a pain to change out with the engine in the car but I've done it.

My rears off my 70.

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After 50 years of hard life, these take a beating. The rears are a bit harder, but totally possible with the engine/trans in place
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emerygt350
post Jul 28 2023, 05:49 PM
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Those rear lines are why I took it to my Porsche guy to do my PMB stainless braid. It took him an hour to do all four. It was money well spent.
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jhynesrockmtn
post Jul 28 2023, 06:38 PM
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Here is a pic of mine where it attaches to the chassis.

It is easier to cut the old line off as close to the "nut" as possible, then you can get a socket on it.

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