[jlillie]

My accumulator pump is turning on for 1 to 2 seconds about every 30 seconds with key on engine off. If i tap the brake it comes right on every time.
Bad accumulator?

Some history; Since i've owned the car (about 6 months) the Anti-Lock light has always been on. The brake fluid light has always come on just momentarily when i hit the brakes but goes off, but is now on full time. Up until today, the braking has always been adequate and I've noticed the accumulator pump would come on every few minutes or so for few seconds then shut off. But now the brakes don't feel so good. Sorting the brake system out was on my list but looks like it just got moved up to first place.

Thank you for any advice.

 

[jvanabra]

99% bad accumulator. Don't let that get out of hand - you don't want that overworking the pump and causing potentially unfixable issues.

 

[Murry101]

I can't recall where I read it but I remember that you should be able to pump the brakes around ten times with the engine off and the ignition on before the pump kicks in. If it takes less than five pumps its time to replace the accumulator.



When I ran this test on my Saab the pump would turn on after only three pumps of the pedal, so I found a new Jaguar accumulator and installed it. Now the pump turns on after 7 or 8 pumps of the brake pedal.


Links to Jaguar accumulator:
https://www.sngbarratt.com/us/#!/English/parts/9a45a642-cf6c-465d-91b2-ca134a964915


https://www.partsgeek.com/gbproduct...o2zCh0STAMqEAQYBSABEgLol_D_BwE&ad=47433948012


Other people might know of cheaper alternatives

 

[jlillie]

Yep. Now on the hunt for a new one.
In some previous related posts i found this one for $280....

https://www.ebay.com/itm/NEW-BRAKE-ACCUMULATOR-Jaguar-JLM1907-Delco-25528382-Saab-4002267-1-HOUR-SHIPPING/254065363348

I like what Jim M. has said multiple times in other posts - basically "any brake accumulator will work", just have to find one that fits. I'm not apposed to running a line from the master cylinder to a more accommodating location but would still have to sort out the line connections.
In yet another earlier post i found that the accumulator thread size is 14mm X 1.5 pitch.

Currently looking for specs on this one for $83 but very likely has wrong thread size and physical size.
https://www.ebay.com/itm/W219-R230-W211-26-D-SBC-BOSCH-Brake-Pressure-Accumulator-0265202070-0004302694/201800719214

I have learned from research - do not buy a used one or an NOS (new old stock). - The bladders go bad in time.

Appreciate your replies

 

[jlillie]

99% bad accumulator. Don't let that get out of hand - you don't want that overworking the pump and causing potentially unfixable issues.

yes, i realized this very early on. Unfixable? yikes, not sure i want to know more about a burned out pump situation.

 

[Murry101]

Yep. Now on the hunt for a new one.
In some previous related posts i found this one for $280....

https://www.ebay.com/itm/NEW-BRAKE-...382-Saab-4002267-1-HOUR-SHIPPING/254065363348

I like what Jim M. has said multiple times in other posts - basically "any brake accumulator will work", just have to find one that fits. I'm not apposed to running a line from the master cylinder to a more accommodating location but would still have to sort out the line connections.
In yet another earlier post i found that the accumulator thread size is 14mm X 1.5 pitch.

I picked the Jaguar unit because it appeared to be identical to the Saab unit. I wouldn't be surprised if it came off the same assembly line. The only noticeable difference was the insert in the bottom of the Saab unit. Good luck.

 

[jvanabra]

Teves made all the parts - GM, Ford, Saab, Jaguar all used the same Mk II stuff.

https://www.jaguarforums.com/forum/...e-block-fail-hard-pull-left-teves-mark-ii.pdf

 

[jlillie]

I pulled my accumulator last night. Key off, i depressed the brake pedal about 40 times. absolutely no pressure unlike some previous posts from other folks.
I drained 6 oz of fluid from the accumulator. I can insert a straw at least 3 inches into the accumulator before it touches anything - super bad I'm guessing.

I was planning on taking the car down this weekend anyways for a complete front end suspension refresh so I can just add this in my list of things to do.

As i see it right now, i have 2 choices; Get the ebay $280 Jag replacement accumulator --or-- sort out the piping and relocate it and choose whatever accumulator I want. I've seen talk about relocating but so far have not heard of anyone actually doing it.....and because of that i'm seriously thinking about it.
That ebay $83 dollar Bosch accumulator sure does look attractive. If i successfully do the relocation i will be leading the way for others because this problem wont be getting any better as far as i can see.
(I think i just talked myself into the challenge.)

Thanks for the info above and the pdf on the jag replacement guys. Any further advice welcome.

 

[jvanabra]

I would be cautious about relocating the accumulator. The accumulator holds 2000psi of pressure, which means whatever exists between it and the pump motor needs to hold 2000psi - all the time.

If you look at the Jaguar manual I posted, you will see that the in some applications the pump+accumulator was mounted remotely to solve packaging problems. I would think if remote mounting only the accumulator was a good approach, that's how Teves would have spec'd it.

Obviously anything can be solved with proper engineering, but I'd move forward carefully.

 

[Jim Mesthene]

An accumulator accumulates pressure. It could do that if it were in the trunk.
Accumulators are cheap and they all do the same thing.
Don't be afraid of pressure numbers, your power steering can produce 1,100 psi all by itself+ (wear safety goggles when dealing with high-pressure hydraulics).
I'd buy the cheapest one that can be fitted and put it anywhere I wanted.
That's just one man's opinion. I did attend SAAB's ABS school in 1990.

 

[paranoid_android74]

I’ve been searching for a replacement accumulator myself, and have also had trouble finding specs for possible candidates.

Here is a pdf at least showing the physical size of the MB accumulator: https://www.bosch-automotive-catalo...tail_WAR_aaecatportlet_orderNumber=0265202070

 

[jlillie]

Paranoid Android; The MB accumulator would be the most likely candidate for a swap. I had run across the data sheet you submitted earlier and found it to be about half an inch wider and about half inch shorter then the original. The only spec I could not find was the size of the MB fluid port. From pictures it appears to be larger. Possibly m16 or even m18. If that's the case, an adapter from m14x1.5 male to m16/18x1.5 would most likely not allow the MB accumulator to fit under the brake fluid reservoir. That would mean relocating. On Saturday, i took a trip to a local junk yard u-pull it type. and could not find a MB accumulator let alone any accumulator at all. I walked the entire yard.
The only way to get the fluid port size would be to buy the $83 ebay offering. I even asked the selller for the size but he said he was not privy to that info.
Now, with all that said, when i got back from the junk yard, i got fed up and just ordered the $280 aftermarket eBay offering just to be done with it as i was wasting time because I wanted to get started on the front suspension rebuild.
But....if i were to do the accumulator relocation, I would use a banjo bolt off the accumulator pump and run it over to the passenger side engine bay.
From my spare engine i found a banjo bolt I think was from the fuel rail. It fit perfectly.
Thanks for the replies guys.

 

[idontownasaab]

FYI the mercedes part works on any of the wabco or teves systems with the big black ball. you can get them for free at any junkyard

 

[jvanabra]

Does it fit properly? Hood closes, no contact with the reservoirs?

 

[idontownasaab]

Does it fit properly? Hood closes, no contact with the reservoirs?

mercedes left teves on right

no reason why it wouldn't fit on your cars

 

[jvanabra]

But this is a guess, not experience-based, yeah?

 

[idontownasaab]

But this is a guess, not experience-based, yeah?

worked on my range rover wabco abs just fine. the jag guys with the same system as your saabs use it too with no issues.

 

[jlillie]

worked on my range rover wabco abs just fine. the jag guys with the same system as your saabs use it too with no issues.

See pic below. Do you see how little room there is to use a larger accumulator? This is why I say above you would have to relocate. I'm pretty sure it would work relocated though.

 

[jvanabra]

I think he's saying the Mercedes accumulator is shorter, so I get why he thinks it would fit... but I just don't assume anything works until someone has done it. Maybe I will go see if I can find one of these at a junkyard.... I have a '93 900S I am happy to blow up in the name of science.

Is there a part number or specific model/body/range where this accumulator can be found?

 

[idontownasaab]

The 03-06 E320, E500 and CLS500 are the cars you’ll find it in. pump brakes 30 times then look for the big silver thing that says SBC, undo the ball with a 17mm socket.