[Chrysler300] 300F Brake Issue

[MARK HOPKINS <m.hopkins@xxxxxxx>]

Hi Rich, Narve and fellow 300 Club folks - I'm catching up on emails and read your advice to Narve about his problem with the '55 brakes with interest. Does the same principle apply to the brake pedal adjustment in the '60 300F? In the past two months, I've replaced all the wheel cylinders front and back, front brake shoes were relined and drums turned, wheel bearings packed, and a right rear axle seal replaced. It stops straight and true with no pulling. 

However, since before all the work was done, the rear brakes have intermittently locked up at low speeds (eg. when pulling in and out of the garage). If I try to go forward, they drag / skid. Despite all the new brake / wheel work, the lockup problem persists. 

If I shift into Neutral and back to Drive they'll release, but may lock up as soon as I push the pedal again. Out on the road, if I come to a stop from 30 mph at a light for example, there is no lockup thankfully. It's just a pain moving in and out of the garage, and somewhat embarrassing parking at car shows. 

Any advice would be greatly appreciated. 

Mark Hopkins in sunny Calgary
(our summers really are nice up here - just too short!) 



----- Original Message -----
From: "Rich Barber" <c300@xxxxxxx>
To: "Narve Nordanger" <narve.n@xxxxxxx>, Chrysler300@xxxxxxxxxxxxxxx
Sent: Sunday, August 12, 2012 2:20:22 PM
Subject: RE: [Chrysler300] A serious 55 Kelsey Hayes issue - brake failure

  




Narve: 

I know you are a thorough guy, but the clearance on the actuating rod from 
the brake pedal to the back of the booster is critical. In theory, 
retraction of the rod when the pedal is released should allow atmospheric 
pressure to flow back into the vacuum side of the booster. If the pedal is 
returned by spring pressure, it should retract the actuator rod. 

There is a small check valve in the outlet of the master cylinder that is 
designed to hold a small amount of residual pressure on the system in order 
to exclude moist air. That small check valve may have been damaged or 
improperly installed. 

Other things to check include the check valve on the vacuum inlet line. 

Progress was made over the years. The brake pedal in the '55 is now wide 
enough to get both feet on it. 

Rich Barber 

Brentwood, CA 

1955 C-300 

From: Chrysler300@xxxxxxxxxxxxxxx [mailto: Chrysler300@xxxxxxxxxxxxxxx ] On 
Behalf Of Narve Nordanger 
Sent: Sunday, August 12, 2012 12:33 PM 
To: Chrysler300@xxxxxxxxxxxxxxx 
Subject: [Chrysler300] A serious 55 Kelsey Hayes issue - brake failure 

Group, 

my C-300 has twice this summer had failure on its freshly overhauled brake 
system. On both occasions the Kelsey Hayes master power brake appear to lock 
up and not letting out the vacuum after I have released the brake pedal. 
Brakes stayed locked until I split the master cylinder from the booster. 
Anyone seen this before, any remedy? 

Additional information: The lightest of touches on the brake pedal sucks it 
in and make immediate contact on the shoes, making progressive braking a 
difficulty. This was evident both with the old (original) and overhauled 
(x-55 De Soto) K-H MC. Having just gone through the brakes on 29 Chrysler 
one really wonders if there was any progress at all in the intervening 26 
years.. 

Narve N 

C-300 in Norway 

[Non-text portions of this message have been removed] 

[Non-text portions of this message have been removed] 





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