Re: [Chrysler300] 300F Brake Issue

[Keith Boonstra <kboonstra@xxxxxxxxxxxx>]

Been dealing with similar symptoms myself, Mark.  A couple of other 
things to check for as well:
- Make sure the 5 brake backer plate bolts are tight and the threads are 
not stripped.
- Make sure your axle castle nut is tightened just right.
- As Dave says, put new return springs on.  Your old ones are probably 
stretched out by 1/8" and uneven. They may be hard to get, but let me 
know if you need 'em.
- A buddy of yours may have an electric belt sander to speed up the shoe 
arcing, but proceed gently.  Otherwise a decent brake shop should have 
the equipment to arc those shoes exactly to your drums.

Keith Boonstra

-
On 8/22/2012 6:49 PM, David Schwandt wrote:
>
> Mark,
> You need to arc the shoes to the drum.
> The toe of the shoe will "catch/snag the drum and have a tendancy to 
> "wrap up" inside and lock.
> Been there, done that with the fronts on my F years ago, after plowing 
> a furrow through a judging tent at a show in Des Moines, IA.
> Very embarrassing to say the least.
> It took several cycles of removing the shoes and sanding with 80 grit 
> paper on a body file to remedy the situation.
> I would pat down the shoes w/talcum powder, reinstall and adjust then 
> rotate a few times by hand.
> While cranking the adjusters the proper direction. This will indicate 
> on the shoes any high spots that need attention
> You probably already know this but the fronts adjust different than 
> the rears.
> Check your service manual for the proper adjustment procedure.
> Question, Did you install ne return springs when doing the rebuild?
>
> Good Luck!!
> Dave Schwandt
>
> -----Original Message-----
> From: Chrysler300@xxxxxxxxxxxxxxx 
> <mailto:Chrysler300%40yahoogroups.com> 
> [mailto:Chrysler300@xxxxxxxxxxxxxxx 
> <mailto:Chrysler300%40yahoogroups.com>] On Behalf Of MARK HOPKINS
> Sent: Wednesday, August 22, 2012 5:37 PM
> To: Rich Barber
> Cc: Narve Nordanger; Chrysler300@xxxxxxxxxxxxxxx 
> <mailto:Chrysler300%40yahoogroups.com>
> Subject: [Chrysler300] 300F Brake Issue
>
> 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 <mailto:c300%40ez2.net>>
> To: "Narve Nordanger" <narve.n@xxxxxxx <mailto:narve.n%40c2i.net>>, 
> Chrysler300@xxxxxxxxxxxxxxx <mailto:Chrysler300%40yahoogroups.com>
> 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%40yahoogroups.com> [mailto: 
> Chrysler300@xxxxxxxxxxxxxxx <mailto:Chrysler300%40yahoogroups.com> ] 
> On Behalf Of Narve Nordanger
> Sent: Sunday, August 12, 2012 12:33 PM
> To: Chrysler300@xxxxxxxxxxxxxxx <mailto:Chrysler300%40yahoogroups.com>
> 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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