My ABS pump is running for 5 seconds every 30 seconds. I have bled the system, used the DANO FAQ to re-cycle the solonoid valves, and done a few stops in the rain to exercise the valves. So far, the pump continues to cycle for a very small period every 30 seconds. After searching the forum I believe the ABS accumulator to be the problem.
Is this part available seperately and what is a brief install proceedure if is is?
Thanks for the safety tip. Absolutely right. Thanks.
Do you know if this part is sold seperately or a brief install. I am guessing it is inside the modulator itself. I maybe getting over my head but will not know untill I understand how this works.
It looks like a 3 inch dia. globe at the bottom on the ALB unit. It's not hard to change you just want to drain off the pressure by opening the bleeder before unscrewing it.
DrewA
I had a similar problem a while ago with my 91. I read the manual and since I do not have the ABS break out box I took it to the dealer and had the ABS flushed. Problem solved, $100 later.
Do you have the electrical box that the dealer has to cycle the different circuits in the ABS? The mechanic told me that sometimes a very small particle will get under one of the seals and cause the accumulator pressure to bleed off which causes the ABS pump to cycle. This problem may appear to be a failed accumulator, but really isn't. I would hate for you to purchase a new accumulator, install it and then still have the same problem. Do you have a dealer / mechanic that you trust to do this service?
(there are two Drew's on this thread Drew and DrewA)
Yeah, I do have one. The box (ALB SST) is just a convenience, the effects of the tool can be effectively duplicated with DanO's ABS bleeding procedures. I can be convinced to loan out the SST, if necessary.
I decided that their was a serious hole in the knowledge base on the ALB/ABS. So I purchased all the tools, parts lists, an extra ALB system and went to work learning....all of which I have documented in a couple of past threads.
The mechanic told me that sometimes a very small particle will get under one of the seals and cause the accumulator pressure to bleed off which causes the ABS pump to cycle. This problem may appear to be a failed accumulator, but really isn't.
However, DrewA seems intent on replacing the accumulator and switch. I too think those parts are just fine based on his objective tests. His efforts will add to the KB in any event.
I'm taking my advice to "Never override the commander on the ground".
DrewA, please let us know what happens.
You gentlemen may certainlly be right. And I will be sure to post my results.
The reason I am proceeding down the path on replacing the ALB accumulator and pressure switch is as follows:
I went through the DanO proceedure twice very throughly with fresh fluid. And before, between and after exercised the ABS on wet pavement. The one thing I was not sure of is that if the ALB SST box did a better job than the DanO proceedure. Drew, I appreciate you posting that the ALB SST box just basically automates the DanO proceedure.
I see no evidenve of fluid leaking back into the resovoir.
Finally, I was able to buy the ALB accumuculator/pressure switch assembly from Larry B, who had an extra new one, at a significently reduced price to list. Drew, thanks for the lead on this unit and thanks for Larry for selling me the unit.
So, I am willing to throw a couple of hundred dollars and a couple of hours time at the problem to see if that gets it. I realize it can certainlly be an internal leak in the modulator itself. But that unit is very expensive and at that point the idea of shorting through the pressure switch lead may be an option.
I will report back next weekend on the results as I realize a lot of owners have had issues in this area.
My nsx had the same problem described by DrewA in post 1 above. This problem has been bugging me for a few months now and flushing the ABS system repeatedly and stomping the brakes in the rain and sandy area didn't solve the problem.
After observing that DrewA solved the problem by replacing the ALB Accumulator/pressure switch assembly, I was inspired to do like wise.
In order to save cost I have decided to change the accumulator (i.e. the iron ball) first and if that doesn't solve the problem i will proceed to change the pressure switch as well. Please note that the accumulator costs less than the pressure switch and the cost of purchasing both separately is less than buying both packaged in together.
Guess what? My nsx stopped making the clicking noise by just changing the ALB accumulator. DrewA's diagnostic was spot on. Silence has never sounded sweeter to my ears.:smile:
I would like to thank everyone on prime for their help especially, Drew and DrewA.
The other more expensive option is to buy/install the SOS ABS upgrade kit. I did this about 5 years ago and have been very happy but it's quite involved and one of the more challenging DIY projects I've done. The instructions from SOS were great .. I'm just saying that if you're not comfortable wrenching; taking things apart; bleeding brakes .. then this might not be for you.
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