[s-cars] No Brake Assist
JR
audiurs4 at gmail.com
Sat Oct 23 17:29:07 PDT 2010
Scott and Chris were right! I went looking on the ground and sure
enough, there were the cap and spring. I never saw them fly out during
the 100 tries it took to get the cap back on, while compressing the
spring and trying to turn the plug all with hydraulic fluid on my
fingers. I can't believe I found them. Popped them back in and the
problem is gone!
Thanks a ton!
JR
On 10/23/2010 05:58 PM, Stott Hare wrote:
> Like Chris asked, did you get the cap and spring back in when your
> reassembled? They are basically the "lifter" assembly for that piston of
> the pump. Might be worth taking that "x" cap off and making sure all the
> correct parts are under there.
>
> -S
>
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of JR
> Sent: Saturday, October 23, 2010 5:50 PM
> To: Robert Myers; s-car-list at audifans.com
> Subject: Re: [s-cars] No Brake Assist
>
> Yes I replaced the fluid with Pentosin CHF 11S (green can). Does that fact
> that the power steering seems to be working fine mean that the pump is fine
> or could it be running well enough to run the power steering, but not the
> brake assist?
>
> Thanks,
>
> JR
>
>
> On 10/23/2010 04:45 PM, Robert Myers wrote:
>
>> *This message was transferred with a trial version of CommuniGate(r)
>> Pro*
>>
>> It's possible that your PS pump may be dead. A dead pump would also
>> show as a dead bomb. The bomb is the "usual" fault but... You've
>> been working on the PS pump and something may have been screwed up in
>> the process.
>>
>> Uh, you did replace the lost fluid with pentosin "green gold"
>> hydraulic fluid and not brake fluid - right?
>>
>> Bob
>>
>>
>> At 05:20 PM 10/23/2010, J R wrote:
>>
>>> *This message was transferred with a trial version of CommuniGate(r)
>>> Pro*
>>> So do you suppose it's just a coincidence that this happened right
>>> when I did an X-plug replacement on the PS pump and an alternator
>>> swap? I'm fine with that, I just want to know that it isn't
>>> something I did during those repairs. Would me moving the hose from
>>> the PS pump to the bomb
>>> (J-hose?)
>>> around, possibly causing a leak in that hose, produce the same
>>> symptoms? I checked both the bolt on the pump and the bolt on the
>>> bomb for this hose and neither were even slightly loose.
>>>
>>> Thanks,
>>>
>>> JR
>>>
>>>
>>> On Sat, Oct 23, 2010 at 4:10 PM, Robert Myers<bob at chips-ur-s.com>
>>> wrote:
>>>
>>>
>>>> The bomb is a structure vaguely reminiscent of the old German
>>>>
>>> potato masher
>>>
>>>> hand grenade of WWII. It has a highly pressurized portion
>>>>
>>> separated from
>>>
>>>> the hydraulic fluid by a membrane. The PS pump pressurizes the PS
>>>>
>>> fluid
>>>
>>>> which "back flows" into the bomb against the diaphragm which
>>>>
>>> maintains brake
>>>
>>>> assist when the PS pump is not working (typically when the engine
>>>>
>>> quits but
>>>
>>>> it can also happen if the PS pump dies). The test for a bad bomb
>>>>
>>> it to let
>>>
>>>> the system pressurize as engine runs. Then turn off engine and
>>>>
>>> repeatedly
>>>
>>>> (counting) press the brake pedal until the pedal gets hard. 30+
>>>>
>>> the bomb is
>>>
>>>> good. 20 or so keep watch on it. 10 - plan on repairs soon. 5 or
>>>>
>>> less do
>>>
>>>> it now. Your test result is zero pumps. Most likely the internal
>>>>
>>> bomb
>>>
>>>> diaphragm has ruptured but it may be possible to install a valve
>>>> and repressurize the high pressure side of the bomb.
>>>>
>>>>
>>>>
>>>> At 04:58 PM 10/23/2010, J R wrote:
>>>>
>>>> The hose from the pump to the bomb is right there where the
>>>>
>>> alternator goes
>>>
>>>> in and out. Could it be leaking? I'm sure I moved it around when
>>>>
>>> pulling
>>>
>>>> and reinstalling the alternator. I don't see any fluid leaking
>>>>
>>> anywhere
>>>
>>>> since I replaced the X-plug.
>>>>
>>>> JR
>>>>
>>>>
>>>> On Sat, Oct 23, 2010 at 3:49 PM, Robert Myers<bob at chips-ur-s.com>
>>>>
>>> wrote:
>>>
>>>> *This message was transferred with a trial version of
>>>>
>>> CommuniGate(r) Pro*
>>>
>>>> It sounds like you now have no braking power assist at all. Your
>>>>
>>> brake
>>>
>>>> pressure accumulator (your "bomb") may be totally dead - or - your
>>>>
>>> PS pump
>>>
>>>> may be totally dead. The total loss of assist is the test for a
>>>>
>>> bad bomb.
>>>
>>>> At 03:47 PM 10/23/2010, you wrote:
>>>> *This message was transferred with a trial version of
>>>>
>>> CommuniGate(r) Pro*
>>>
>>>> I replaced my alternator and the X-Plug on my PS pump, and ever
>>>>
>>> since I
>>>
>>>> have
>>>> no brake assist at all. The brake light is on all the time. The
>>>>
>>> pedal is
>>>
>>>> as hard as a rock and it is very very hard to stop the car. Power
>>>>
>>> steering
>>>
>>>> is fine. PS and brake fluid levels are fine. Anyone have any idea
>>>>
>>> what I
>>>
>>>> might have bumped, broken or done wrong that would cause this?
>>>> _______________________________________________
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>>>>
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>>>>
>>>>
>>>>
>>>>
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>>>>
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