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Odd place for a rotor crack
I am rebuilding my calipers and when I took the rear passenger rotor off to do a close inspection I found this crack on the inside parking brake "drum". Just thought it was an odd place to find a crack but something I will check in the future. I never set the parking brake after a track session in case your wondering. The rotors were down to 0.875" thickness which is real close to the limit, so they were heading for their last DE anyway. Glad I caught it. Anyway I just thought it was unusual enough to post and make folks aware.
 Andrew
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'88 Carrera Cab 3.2 Diamond Blue Metallic - ERP Polybronze Bushings, ERP Monoballs, SW Chip, Bilstein Sports, 930S Steering Wheel, DAS Rollbar, Sparco 5pt Harness, Hunsaker Sport Seats, Dansk Pre-Muffler, MK 1in-1out Exhaust, Magnecor KV8.5 Wires '86 944NA, Sunroof Delete, Track Rat, Full Cage '72 914 1.7 Guards Red / '02 Audi S4 Light Silver Metallic |
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05-22-2007, 08:19 AM
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abit off center
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Looks like it started at the hole? Is that another crack to the left too?
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
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05-22-2007, 08:48 AM
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You are correct that it does extend to the hole above it. The crack is barely visible from the front and only extends towards the hub. It can only be seen if the light hits it at the right angle. I certainly didn't see it from the front and I am pretty carefull about looking for cracks on these x-drilled rotors based on past experience. In fact I'll be ordering new rotors today and they will not be these.
The line to the left is just a casting reminant.
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'88 Carrera Cab 3.2 Diamond Blue Metallic - ERP Polybronze Bushings, ERP Monoballs, SW Chip, Bilstein Sports, 930S Steering Wheel, DAS Rollbar, Sparco 5pt Harness, Hunsaker Sport Seats, Dansk Pre-Muffler, MK 1in-1out Exhaust, Magnecor KV8.5 Wires '86 944NA, Sunroof Delete, Track Rat, Full Cage '72 914 1.7 Guards Red / '02 Audi S4 Light Silver Metallic |
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05-22-2007, 09:14 AM
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Back in New England!
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Are those the Zimmermann's?
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'78 RoW 911SC Targa converted to a '86-like 3.2L Cab (w/930 body & No A/C) Custom subframe integrated into AutoPower Half Cage, Euro Ride Height, Turbo Tie-Rods, WeltMeister Bump Steer Kit, Sway-Away 26mm Rear Torsion Bars, Koni Adjustable Shocks and Strut Inserts, Two Bar Rennline Strut Tower Brace, Poly Motor Mounts, WEVO Trans Mounts, Modified Conical K&N Intake, ER PB A-arm bushings and 17" CUP3 Wheels. Steve Wong Chip! |
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05-22-2007, 09:20 AM
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Yes, they are Zimmermann's
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'88 Carrera Cab 3.2 Diamond Blue Metallic - ERP Polybronze Bushings, ERP Monoballs, SW Chip, Bilstein Sports, 930S Steering Wheel, DAS Rollbar, Sparco 5pt Harness, Hunsaker Sport Seats, Dansk Pre-Muffler, MK 1in-1out Exhaust, Magnecor KV8.5 Wires '86 944NA, Sunroof Delete, Track Rat, Full Cage '72 914 1.7 Guards Red / '02 Audi S4 Light Silver Metallic |
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05-22-2007, 09:26 AM
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cycling has-been
Join Date: Sep 2004
Location: Jersey Shore
Posts: 7,238
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looks like someone's done quite a few miles with the e brake engaged?
curious, is your warning light working? Bill K
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73 911T MFI, 76 912E, 77 Turbo Carrera |
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05-22-2007, 09:49 AM
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I'd be lying if I said I have never pulled out of the driveway with the parking brake on
 But "quite a few miles"? Not that I am aware of, but....... perhaps the evidence says otherwise The warning light does work. And the parking brakes do need to be adjusted when this rebuild is done. The lever had to be pulled way up to hold the car.
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'88 Carrera Cab 3.2 Diamond Blue Metallic - ERP Polybronze Bushings, ERP Monoballs, SW Chip, Bilstein Sports, 930S Steering Wheel, DAS Rollbar, Sparco 5pt Harness, Hunsaker Sport Seats, Dansk Pre-Muffler, MK 1in-1out Exhaust, Magnecor KV8.5 Wires '86 944NA, Sunroof Delete, Track Rat, Full Cage '72 914 1.7 Guards Red / '02 Audi S4 Light Silver Metallic |
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05-22-2007, 10:15 AM
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Join Date: Feb 2002
Location: Asheville, NC
Posts: 1,415
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Hopefully you will be switching to non-drilled rotors if you will be continuing with the track work.
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Gone but not forgotten - 1980 Porsche 911SC w/ -22mm/28mm Torsion Bars | Custom Valved Bilsteins | 22mm/21mm Carrera Sway Bars | Elephant Poly/Bronze Bushings | Carrera Brakes | AJ-USA Brake Cooling | Carrera Oil Cooler w/ Fan | Elephant Strut Brace | Oh, and no ABS or PSM or A/C |
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05-22-2007, 12:54 PM
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Quote:
as long as they're stock carrera brakes, there's no reason to jump on the crossdrilled bandwagon. |
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05-22-2007, 01:05 PM
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Quote:
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'88 Carrera Cab 3.2 Diamond Blue Metallic - ERP Polybronze Bushings, ERP Monoballs, SW Chip, Bilstein Sports, 930S Steering Wheel, DAS Rollbar, Sparco 5pt Harness, Hunsaker Sport Seats, Dansk Pre-Muffler, MK 1in-1out Exhaust, Magnecor KV8.5 Wires '86 944NA, Sunroof Delete, Track Rat, Full Cage '72 914 1.7 Guards Red / '02 Audi S4 Light Silver Metallic |
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05-22-2007, 01:15 PM
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1988 Porsche Carrera Cabriolet 3.2
1969 and 1986 Porsche Targa and Coupe 1720cc and 3
1978 Porsche 911 3.2L
