[Chrysler300] '63 Chrysler 300 Brake News
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[Chrysler300] '63 Chrysler 300 Brake News

Hi All,


I got some news for some of you that I have never heard on this forum.  I learned this from the below link.  My push rod adjustment on the power brake booster was set too far out.  READ BELOW


http://www.mymopar.com/downloads/mtsc/187.pdf   (see under paragraph ‘Dragging Brakes’)  page 9 and POWER BRAKES page 11


“If the adjustable master cylinder push rod in the brake booster is too long, the piston won’t uncover the compensating port in the master cylinder.”  The fluid will be trapped and the wheel cylinder pistons won’t come back.


I took the master cylinder cover off to check for “turbulence” when the pedal was pushed down and then released.  I saw no “turbulence”, which means the fluid was not coming back in the master cylinder.

Conculsion: If the power brake booster adjustment rod is too far out, the brake fluid will not go back into the master cylinder and the brakes will drag.  It was not the hoses.  It was the piston/compensating port.


Now, everything is fine.


I would encourage all of you that have brake issues to read the attached “BRAKE SERVICE”.  I learned a lot, including how to diagnose ‘Brake Chatter’ and other common issues.



Mark Lindahl

’63 300 Conv.




Posted by: "Mark Lindahl" <MPLindahl@xxxxxxxxxxxxx>

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