[s-cars] Bomb light coming on - '90 CQ

[Kneale Brownson]

I thought this was about a 5ktq, not your coupe.  I don't know anything about
the plumbing of the coupes and I don't have any reference material on them. 
But I'd say you should still be able to undo that line at the servo, or at
least loosen it a bit, to see whether it seaps a couple drops or a steady flow.


At 07:02 PM 11/5/2006 -0500, Dave Kase wrote: 
>
> On the CQ that line from the servo (behind the master cyl) goes to a joint
> return line with the bomb and rack.
>
> It looks like that is the only line in/out of the booster.  Where will the
> fluid come from if the only line is unhooked?  I take it there must be a
> supply line as well that I am missing.
>
> DK
>
> Kneale Brownson wrote: 
>>
>> There is a line coming off the booster right behind the brake master
>> cylinder.  Starts out as a piece of brake pipe and then becomes a hose. 
>> Goes into the reservoir at the top of the reservoir.  Should be only one
>> line, one connection to the reservoir.  In the Bentley for the 5k cars, page
>> 47.20, it says to unscrew the return line at the servo.  If hydraulic oil
>> runs continuously (with the engine off), the servo is bad.  If only a few
>> drops come out, it's OK.  I've never unscrewed the metal pipe.  I've undone
>> the hose clamp holding the hose to the reservoir.  
>>
>> Your description sounds like you're looking at the return line from the
>> "bomb" to the reservoir.  That goes to the bottom of the reservoir.  Again,
>> you want to go to the booster, or servo, that the master cylinder mounts to.
>>
>>
>> At 03:02 PM 11/5/2006 -0500, Dave Kase wrote: 
>>>
>>> I''m not sure I understand.  There is one line from the booster to the
>>> resevoir return lines (goes into a 4-way fitting).  If I pull that line I
>>> get all the hyd fluid returning from the rack - a stream.
>>>
>>> What am I missing?
>>>
>>> DK
>>>
>>> Kneale Brownson wrote: 
>>>>
>>>> I'm talking about the booster, the device to which the master cylinder is
>>>> mounted.  Pull the return hose from the booster off the reservoir nipple. 
>>>> You should only get a drop or two of hydraulic oil out of it.  If you get
>>>> a stream, the booster needs replacement.
>>>>
>>>>
>>>> At 11:26 AM 11/5/2006 -0500, Dave Kase wrote: 
>>>>>
>>>>> I tried two of my own recharged bombs on it, same result.
>>>>>
>>>>> DK
>>>>>
>>>>> Kneale Brownson wrote: 
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> Bad booster?
>>>>>> 
>>>>>> 
>>>>>> At 01:50 AM 11/5/2006 -0500, Dave Kase wrote:
>>>>>>    
>>>>>>>
>>>>>>> Even with a fresh bomb the yellow bomb light comes on! Dave Kase '91
>>>>>>> e//S2 '90 CQ - sold _______________________________________________
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>>>>>>
>>>>>>   
>>>>>
>>>>
>>>
>>
>