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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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davep |
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#2
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914 Historian ![]() ![]() ![]() ![]() ![]() Group: Benefactors Posts: 5,162 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada ![]() ![]() |
As was stated earlier, this is not uncommon with fresh rebuilds. The best solution is to drive it a few hundred miles around town to get the seals 'worn in'. Then check it again. The knock-back effect of the seals is quite pronounced after rebuilding. Were the pistons & seals put in dry, or were they lubricated during assembly. I use special lube for calipers during assembly, and rarely have the problem.
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tomeric914 |
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#3
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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 ![]() ![]() |
As was stated earlier, this is not uncommon with fresh rebuilds. The best solution is to drive it a few hundred miles around town to get the seals 'worn in'. Then check it again. The knock-back effect of the seals is quite pronounced after rebuilding. Were the pistons & seals put in dry, or were they lubricated during assembly. I use special lube for calipers during assembly, and rarely have the problem. Thanks Dave. I didn't rebuild them myself or they would have been lubed for sure! When I took out the .050" shim, the inside pad is now against the rotor somewhat hanging it up. I haven't driven it yet so maybe putting the wheel back on and taking it out will solve that. As for centering the caliper, what is the general consensus? Should the caliper split be centered over the midpoint of the rotor OR should the pad "guides" cast into the caliper have the same distance from the face of each side of the rotor? |
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