Re: [Chrysler300] Brake booster

["Robert Hayen" <robert554@xxxxxxxxxxxxxx>]

what master cylinder  are you using?     Bob Hayen
----- Original Message ----- 
From: "Michael Moore" <mmoore8425@xxxxxxx>
To: "Paul Martin" <paul_martin78ca@xxxxxxxx>
Cc: <chrysler300@xxxxxxxxxxxxxxx>
Sent: Sunday, May 06, 2012 10:42 PM
Subject: Re: [Chrysler300] Brake booster


> Paul, my 300H had that problem. After trying eveything else, I decided the 
> low pedal was caused by the pushrod between the master cylinder and the 
> booster needed adjusting, something the shop manual says not to do.
>
> There needs to be a small amount of clearance between the master cylinder 
> piston and the pushrod from the the booster to accommodate expansion of 
> brake fluid.
>
> On another make car I have, I found that too little clearance will cause 
> the brakes to set up. I never found a reference to how much clearance 
> there should be on my car, but decided .060 was a good place to start.
>
> It's tricky to measure the depth of the piston in the master cylinder, but 
> by measuring that and the length of the adjustable rod coming out of the 
> booster, and a little arithmetic, I found  I had something like 1/2 inch 
> clearance.
>
> If you consider the pivot point of the brake pedal as a reference, then 
> measure from the pivot to the booster rod, you'll find a small number , 
> say 2 inches.  Then measure from the pivot to the brake pedal, you may 
> find 11 inches. This is a multiplier of 5-1/2  to 1. So if you have 1/2 
> inch clearance and can reduce it to .060 (1/16), you'll raise the brake 
> pedal by ca 2-1/2 inches. (I have made up the lever numbers as I forgot 
> the real numbers, but you get the idea.)
> It made a huge difference in my brakes.
> Best Regards,
> Mike Moore
>
>
> On May 6, 2012, at 9:10 PM, Paul Martin wrote:
>
> I am just finishing up the AAJ disc brake conversion on my 300F. I have 
> evacuated the air from the lines and have a good solid pedel with the car 
> not running, however when I start it up and apply the brakes the pedel 
> goes low to the floor,not all the way and the car still stops but not 
> well. I double checked to make sure all the air was out of the lines.
>
> Ant tips? Is there something I need to do to the booster.
>
> Any help would be appreciated.
>
> Paul Martin
>
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