Re: Buick Disc Brake Conversion

".boB" <noneofyourbusiness@[EMAIL PROTECTED]
> wrote in news:46a56572$0$4354
$ec3e2dad@[EMAIL PROTECTED]
> rpace@[EMAIL PROTECTED]
 wrote:
>> I just purchased and put on a disc brake conversion for a 1968-1972 GM
>> A body car.  My car is an 1971 Buick GS with the 350 Stage 1.  I
>> purchase the kit off of ebay from waterloo tire company out of Iowa.
>> Of course it came with no instructions.  I put on the parts myself and
>> could not get it to work. I took to local mechanic and he can't fiqure
>> out why it won't work.  Here is a summary of what we did:
>> 
>> Installed new bearings, spindle and rotors.  New SS braided hose.  New
>> chrome power booster, master cylinder, pro****tioning valve and lines
>> from mastercylinder to pro****tioning valve.  Had to get new lines to
>> rear becuase could not get fittings to match.  Had new rubber brake
>> hose made from front to rear.
>> 
>> Here is what she is doing:
>> When car is turned off I have hard pedal.  When cranked there is no
>> pedal.  I have bench bleed master several times and power bleed it.  I
>> can't get any pedal when it is cranked.  No stopping except a if not
>> going fast rear brakes will lock up and gradually stop the car.  I
>> plugged the master cylinder and it has hard pedal.
>> 
>> Any suggestions on what to do?
>> 
> 
> If the brakes work and you have a good pedal when the 
> engine is off, and then the brake pedal sinks to the 
> floor with the engine on, the problem is the booster.
> 
> "The booster is an empty shell that is divided into two 
> chambers by a rubber diaphragm. There is a valve in the 
> diaphragm that remains open while your foot is off the 
> brake pedal so that vacuum is allowed to fill both 
> chambers.  When you step on the brake pedal, the valve 
> in the diaphragm closes, separating the two chambers 
> and another valve opens to allow air in the chamber on 
> the brake pedal side.  This is what provides the power 
> assist."
> http://www.familycar.com/brakes.htm
> 
> Essentially, you're getting too much vacuum assist.
> 
> 
> 

no it would not go to the floor with too much assist. It would stay hard 
anyway.   KB
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