Fwd: Re: Fwd: Re: IML: 1960 Imperial brake bleeding

[richard burgess <lecrown60@xxxxxxxxx>]

Note: forwarded message attached.

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• From: Burgess <burgessb@xxxxxxxxxx>
• Date: Tue, 23 Oct 2007 20:27:22 -0700 (PDT)

On the 60 Imperials, what you adjust is the length of the push rod from the brake pedal into the master cylinder.  There is a specified freeplay in the manual.  If the rod is too long, there will be no free play and the master cylinder piston will not return to it's rearmost position. It will therefore not have as much fluid to displace when the pedal is pressed again, running the master cylinder almost out of fluid (Low Pedal) before the wheel cylinders can fill and apply pressure to the shoes.  There is no rod to adjust on the actual brake booster.  Keep in mind the brake booster is only a power assist to push the pedal and has no other connection to the hydraulic system.  If when the car is running (vacuum applied to brake booster) the booster is pushing the pedal down slightly then this will slightly depress the master cylinder and reduce the available fluid to the wheel cylinders.   If this is the case the "old Dealer" may have shortened the master cylinder push rod further to allow the master cylinder to again fill completely.  In any case the brake shoe adjustment should be made often enough to maintain the pedal height.
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