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Brake booster pressure hose replacement DIY?


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I purchased a 2004 CTT with 195k miles on it a few months ago. At the time i bought it, i did so knowing that the 'brake booster faulty' light came on in the cluster. On a couple different forums, it was suggested to me that i simply tape the pressure hose. I took the truck to an indy recently to check what needed to be done for a 200k mile service, and his recommendation was to just replace the hose with an updated pressure hose.

 

I've been DIY'ing a lot of the other jobs on the major maintenance checklist, and was hoping to tackle this myself too. But i'm having trouble identifying which hose this pressure hose actually is. I have the service manuals and can't find the right section for this either.

 

Has anyone tackled this before? What should i be looking for? How should i be going about this?

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  • 2 weeks later...

I had the same issue in my '03 TT...thought it was the vacuum pump itself because it was whining...turns out it was the hose from the pump to the booster.  I learned this the hard way by replacing the pump itself. The part number for the hose is 955 355 577 51.  If you go to one of the parts websites with parts diagrams, it's #13 under the Brake section, subsection Brake Master Cylinder Brake Booster Vacuum Line Vacuum Pump.  There's a bunch of different part numbers but this is the one for the Turbo.   

 

 as for replacement, it's not that difficult. I mean it is a pain in the butt like almost anything with a Cayenne Turbo, but it's less challenging than a lot of things. First, remove the engine bay trim and then You've got to remove the windshield wipers and cowl.  Be extremely careful with the wiper removal, mostly the driver side because it's extremely easy to crack the windshield, if you're not careful...again, learned this one from experience.  If it's difficult to remove, i'd recommend a puller. Once you the get cowl off, you can follow the hose to the brake booster.  One of the most difficult things was getting the hose in the rubber grommet in the booster.  You really need hands the size of a 10 year old with the strength of a grown man.

 

One last thing, if you're not a contributing member, become one and start ordering parts from Sunset through the Renntech site.  On this hose alone I saved probably 50% of what you'll find from the other Porsche parts websites.  I've saved tons of money over the last couple of years.  I get parts cheaper than my mechanic.  Typically, you're not going to get them overnight unless they're in stock, but if you don't need them quick, this is absolutely the best place to go.

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