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tomeric914 |
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One Lap of America in a 914! ![]() ![]() ![]() Group: Members Posts: 1,259 Joined: 25-May 08 From: Syracuse, NY Member No.: 9,101 Region Association: North East States ![]() ![]() |
ok, so I converted my 914 rear brakes to vented disc with 911 M calipers and internal drum parking brakes. Brakes work great but the pedal travel is longer than it should be. Went to rebleed everything and found that one of the rear calipers had a pad to disc clearance of .010" which probably explains the travel. Also verified that the pistons were working and not hanging up.
I've got a rebuilt proportioning valve from PMB that is working correctly. Running an ATE 19mm MC (bought a new one thinking it had the 17mm). No bubbles in the system using ATE SuperBlue brake fluid. I've never seen a caliper piston release that far just on one side. Anyone have any ideas? This is frustrating! |
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jaxdream |
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Senior Member ![]() ![]() ![]() Group: Members Posts: 974 Joined: 8-July 08 From: North Central Tennessee Member No.: 9,270 Region Association: South East States ![]() |
Thaks , davep. I goggled for brake assembly lube , from what I read ( ??) it seems that ATE brake paste is not allowed to be inported for evironmental / msds stuff , so I search on. Thanks again.
tomeric914 , it sounds like your caliper pistons are sticking , and the rebuild should fix that , as for the .030 shims ,thats not a lot and would probably be offset by the caliper rebuild, but hey , if ya gotta do it ,do it right. Yopu can get shim stock ( stainless , brass ,etc ) by the roll off of ebay fairly cheap , or maybe Napa carrys shim stock . Good luk Jaxdream |
tomeric914 |
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One Lap of America in a 914! ![]() ![]() ![]() Group: Members Posts: 1,259 Joined: 25-May 08 From: Syracuse, NY Member No.: 9,101 Region Association: North East States ![]() ![]() |
tomeric914 , it sounds like your caliper pistons are sticking , and the rebuild should fix that , as for the .030 shims ,thats not a lot and would probably be offset by the caliper rebuild, but hey , if ya gotta do it ,do it right. Yopu can get shim stock ( stainless , brass ,etc ) by the roll off of ebay fairly cheap , or maybe Napa carrys shim stock . Good luk Thanks Jax, they were sticking and are now all nice and rebuilt. I ordered 5mm fixturing washers from Grainger back in September that turned out to only be 4mm. Added in a .050" shim to get it right. Still too much pedal travel and the rears are locking before the fronts. Bled a few times now with good flow. I suspect the MC but hate to put it in if it isn't the problem. Brake setup on my 914 is essentially mid 70's 911 except that is has the 914 proportioning valve. I'm going to bleed the rears one more time. If I still have the same problem then I'll change the MC. |
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