6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHABS problem 2001 996
Leading reported evidence
Replace original back in
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
I considered the possibility of installing a defective m/c so I swapped the original back in.
Leading evidence: 'Replace original back in' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean i flushed the ebay unit' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
I replaced said m/c and bled the system with a quart of Dot 4.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
To be sure it was clean, I flushed the eBay unit with about a cup of denatured alcohol, then flushed with Dot 4.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
2 acknowledgements have no verified action link; they do not establish a repair result.
I get a lot of information from this forum and wanted to contribute my current experience. I got my 2001 996 as a roller and this being my first Porsche, I never experienced what normal brake pedal should feel like. Constant pressure to the brake pedal would result in a slow drift of the pedal to the floor. Seemed pretty obvious m/c failure. I replaced said m/c and bled the system with a quart of Dot 4. Did not have the tools to activate the abs but figured I would at most get a spongy pedal. As you can guess, problem not solved. I considered the possibility of installing a defective m/c so I swapped the original back in. This time, the pedal would hold better if I pressed it quickly like in a panic mode, but again slowly drift down with constant pressure. I could tell the problem was in the rear brake circuit as my front brakes would begin squeal in city traffic. Called around for advice, searched on the web and saw some mention on flushing out the brake hydraulics with denatured alcohol, rebuilding all the calipers and bleeding the brakes with the abs activated. After rebuilding the calipers, I finally swapped out the ABS with one I got on eBay and problem solved. Didn't need to activate ABS to bleed. Interesting that I never got a ABS code. I found issues surrounding the ABS in earlier Porsche's but did not come across one in a 996.
That seems a little strange but good to know the controller doesn't always pop a code. FYI, I've never had to activate the ABS to bleed my brakes and have never had any issues.
How did you like rebuilding the calipers? Those pistons shoot out with some force don't they?
I was told the ABS pump (doubling as the PSM precharge pump on cars that have this option) was specifically coded to the car and a spare off eBay (or anywhere) would not work without an expensive coding operation by the dealer.
Glad to hear this isn't the case as it gives my PSM failure issue some hope once again.
I made sure the ABS part number matched exactly. To be sure it was clean, I flushed the eBay unit with about a cup of denatured alcohol, then flushed with Dot 4.
I really am enjoying a firm pedal now!
jim
This is a source reference. Confirm exact model applicability in the original material.
