Re: [DML] Brake booster/Servo troubleshooting

["Elvis Nocita" <elvisnocita@xxxxxx>]

Ed,

do you feel a difference at the break pedal when the engine is
off or when it is on ?
When on, the pedale should be much easier to be pushed.

BTW - what is a "vacuum noise" ?

How many miles have you put on the new (?) pads ?

When bleeding new capilers you have to make sure that the 
outer side has no more air trapped in it ! Just regular 
bleeding won't get it out !


The vacuum line ends on the right side in the engine bay
where it goes to a T-piece and splits up for the vacuum reservoir
and where it connects to the right side of the intake manifold.

Elvis & 6548 - with the larger Ford Granada Calipers

-------- Original-Nachricht --------
Datum: Wed, 28 Jun 2006 18:32:43 -0400
Von: "Ed B." <mr.pants@xxxxxxxxxxxx>
An: DMC_News <dmcnews@xxxxxxxxxxxxxxx>
Betreff: [DML] Brake booster/Servo troubleshooting

> A few question about the brake booster/servo:
> 
> My braking is the pits: I can slam the brakes on, hold with all my force 
> and I will not lock the wheels up.  The car does stop, but it's nowhere 
> near what it should be in terms of rate of deceleration.  This is at 
> around 15mph in my driveway.  At higher speeds, I do slow down, but 
> again, it seems really poor and I have to apply a LOT of pressure to get 
> decent braking.  I'd be screwed if I had to do a panic stop at speed.  
> All brake components are good/new: master cylinder, calipers, rotors, 
> pads, fluid, all is properly bled, no air in the M.C.  I know the 
> DeLorean brakes are not the greatest, but this is terrible. 
> 
> Would a bad servo cause weak braking?  I removed the vacuum hose from 
> the servo and there is nice suction from it when the engine is running.  
> I also did a crude test of the check valve by connecting separate, short 
> hose to the check valve inlet and I cannot blow through, but I can draw 
> (albeit with difficulty and not freely), indicating the check valve is 
> functioning, right?  I do hear a faint hissing around the servo, but it 
> doesn't sound like a leak - more like the vacuum noise inside the hose.  
> What else can i check?
> 
> How do I check if the actual servo/booster itself is good?  The manual 
> does not seem to be much help here -  it doesn't even show where the 
> other end of the vacuum line goes in the engine bay...
> 
> Thanks...
> - ed
>
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