Brake Booster Pump
10-21-2003, 01:43 PM
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Brake Booster Pump
After 8.5 years I finally found out about how to quiet the howling brake booster pump. Porsche incorporated an upgrade for 97 and has a kit for the 96. Has anyone done this to their car and did it work well? I ordered the parts and will check back in after I install them.
12-19-2003, 02:38 PM
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No part# for the overall kit, here's the individual part#s for TSB#9506 dated 2 Nov 95.
Damper 993 355 123 03
Long Hydraulic Line 993 355 249 04
Short Hydraulic Line 993 355 247 02
Plug and O-ring 993 355 954 00
Bolt 900 378 158 09
Bushings (3) 964 355 908 50
Damper 993 355 123 03
Long Hydraulic Line 993 355 249 04
Short Hydraulic Line 993 355 247 02
Plug and O-ring 993 355 954 00
Bolt 900 378 158 09
Bushings (3) 964 355 908 50
12-19-2003, 02:42 PM
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Sounds great! Can you do a write up on how you changed everything? Or did you have it done. I'm assuming that the plumbing is not that hard, but a hammer is probably needed during the final bleeding process.
12-19-2003, 03:15 PM
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Let me start by the TSB application-cars built before 14 July 95, serial# 375468 and older. The TSB is real handy to refer to, especially the diagrams. You essentially replace a long hydraulic line with two shorter ones with a damper in between. The assembly then weighs more, so stiffer bushings are needed to support it. Plumbing the longer of the two lines was kind of tough, as it winds behind and through several things and has to be bent into place, then rebent into the original shape. Bleeding wasn't too bad. The TSB says to use a computer(Hammer?) to manipulate the ABS block, but I just hooked my Griot's Garage fluid sucker to the bleeder on the pressure accumulator in the trunk and ran the booster motor. Definitely as worthwhile project for early build Turbos and C4Ss.
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12-19-2003, 05:49 PM
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Your local Porsche dealer will have it in the service department. It's in the TSB compilation book L starting on page 75. If they are buttheads about copying it for you let me know and I'll make a trip to Kinkos and mail it.
