 914 /6 Master Cylinder Swap |
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| dheinz |
 Mar 4 2004, 05:25 PM
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#1
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cross member  Group: Members Posts: 122 Joined: 7-August 03 From: Pittsburgh, PA Member No.: 995  |
The brakes on my 914/6 still feel spongy after a super blue fluid flush and several bleedings.
The car has stainless steel lines, but I do not know how old the master cylinder is. I have access to an 89 911 19mm master cylinder in great working shape. The question is will it fit without modification. Eddie |
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| davep |
Mar 4 2004, 05:59 PM
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#2
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914 Historian Group: Benefactors Posts: 5,154 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada  |
I wouldn't think so. They converted to boosted brakes in the late 70's so the masters are not going to be the same.
How were the brakes before you flushed? The stainless lines can flex also. I still think new rubber lines are best. Check inside the boot on the back of the master. If it is wet with brake fluid, it is done. A new master should be about $100. DaveP |
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| Dave_Darling |
Mar 4 2004, 06:31 PM
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#3
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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Sounds like the MC you are thinking of getting is on a car right now. In other words, it's used--just like the one you already have.
My main suggestion is bleeding the system again. Most especially the proportioning valve, but also including the calipers. Remember, air bubbles rise--so to get the air out, you need to make sure you are bleeding from the valve at/near the top of the caliper! If you bleed from the bottom of the caliper, you'll never get the air out. Uhh, not that I'd know this from experience or anything.... <_< --DD |
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| Andyrew |
Mar 4 2004, 06:37 PM
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#4
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Spooling.... Please wait Group: Members Posts: 13,376 Joined: 20-January 03 From: Riverbank, Ca Member No.: 172 Region Association: Northern California
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I have a new M/c in my car, 19 mm, and new lines and a T for a vavle, but I still have squishy brakes, per to say.. They stop veeeery nice, (thanks to 911 A calipers, and new rotors and pads up front) But I think I bet I need new pads in the back. Check to see if you have good pads as well when freshening up the brake system.
Andrew |
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| Van914 |
Mar 4 2004, 07:39 PM
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#5
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Van914 Group: Members Posts: 698 Joined: 5-January 03 From: Cincinnati, Ohio Member No.: 90 Region Association: Upper MidWest
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Be sure to check the rear venting clearance. Too much clearance and you will have a soft feeling brakes. Make sure when you adjust, you use washers and the lug bolt to snug the rotor to the axle.
Van914 |
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| SirAndy |
Mar 4 2004, 07:51 PM
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#6
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Resident German Group: Admin Posts: 41,679 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
another thing i have seen a few times now:
people mount their calipers upsidedown !!! like, move them from left to right and mount them with the bleeding nipple on the bottom, in which case you'll never get the air out. (IMG:style_emoticons/default/wink.gif) i too got the 911 19mm MC new. don't use a used one, they're not that expensive ... Andy |
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