Re: [Chrysler300] Re: F brakes locking up on way to Holland meet
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Re: [Chrysler300] Re: F brakes locking up on way to Holland meet





Thanks again for everyone's suggestions. The issue appears to have been a sticky nylon button or valve return spring, something at the interior side of the unit. A liberal dose of wd 40 has kept everything working fine since then. Very difficult spot to lubricate, but I will put this on my annual spring list. A slight lifting of the brake pedal releases the locking in case that happens to someone else. I am assuming that in the process of cleaning, sandblasting, repainting, and generally moving it around, either some dirt got inside or a bit of something moved inside after 55 years on the car. If it continues to behave, I think I will forgo a rebuild as that is a major hassle with the carbs, etc.
Any thoughts on leaving it alone vs rebuilding? 

On Thu, May 19, 2016 at 8:23 AM, David Schwandt <finsruskw@xxxxxxxxxxxxxxx> wrote:

10-4 on that!!

I had a PB unit rebuilt by BD for our F when we rebuilt it after the St Louis meet a few years back.

Installed it in the fresh engine bay during the engine install.

60-61 brakes, w/the rams are a TOTAL PITA!!

I messed with it for what seemed like forever, finally giving up and reinstalling the original unit before I could get brakes, and it’s still in there today

Meanwhile, the $$$ worth of re-built unit resides in it’s original shipping box, a doorstop!

 

 

 

From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of John Grady jkg@xxxxxxxxxxxxxxxxx [Chrysler300]
Sent: Wednesday, May 18, 2016 6:28 PM
To: Ron Waters
Cc: Chrysler300@xxxxxxxxxxxxxxx; lindsey@xxxxxxxxxxxxxxx


Subject: Re: [Chrysler300] Re: F brakes locking up on way to Holland meet

 




I agree with Rich , need a gap there that is co ordinated with the trigger gap at top . They tell you not to touch it , the settings -/but we know where that goes . This is another item that needs total clarification like the hood lock . Someone like Booster Dewey needs to write down exactly how it works and what the gaps do when right 

Sent from my iPhone


On May 17, 2016, at 8:46 PM, 'Ron Waters' ronbo97@xxxxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:

I would advise NOT to touch the pushrod. Remember: He's already driven 1000 miles with no problems. If it was the pushrod, problem would have shown up immediately.

 

Ron


From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of 'Rich Barber' c300@xxxxxxx [Chrysler300]
Sent: Tuesday, May 17, 2016 6:58 PM
To: Scooter465@xxxxxxx; kmaniak@xxxxxxx
Cc: lindsey@xxxxxxxxxxxxxxx; Chrysler300@xxxxxxxxxxxxxxx
Subject: RE: [Chrysler300] Re: F brakes locking up on way to Holland meet

I think the rod length spec is given in 64ths.  And that the length can be adjusted by loosening a jam nut on a finely threaded rod.  If jam nut loosened, the length could change enough to actuate and lock the brakes.

 

Rich Barber

 

From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Scooter465@xxxxxxx [Chrysler300]
Sent: Tuesday, May 17, 2016 3:08 PM
To: kmaniak@xxxxxxx
Cc: lindsey@xxxxxxxxxxxxxxx; Chrysler300@xxxxxxxxxxxxxxx
Subject: Re: [Chrysler300] Re: F brakes locking up on way to Holland meet

 

 

How about the pushrod length adjustment can cause brakes to drag if it is adjusted to long brakes heat up and lock up.

Sent from my iPad


On May 17, 2016, at 5:45 PM, kmaniak@xxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:

 

I have experience a rubber hose failure where internal degradation creates a check valve effect that prevents the brake from releasing when the pedal is released.  The age of rubber hoses is not measured in miles, it is measured in years.  How long ago did you replace those hoses?  They can look fine on the outside but still fail on the inside.   A single hose failure would cause a problem only with the wheels controlled by the suspect hose, not all at once.  This is just one possibility, you may have something else going on if all wheels or both fronts together lock up.

 

-----Original Message-----
From: lindsey <lindsey@xxxxxxxxxxxxxxx>
To: kmaniak <kmaniak@xxxxxxx>; Chrysler300 <Chrysler300@xxxxxxxxxxxxxxx>
Sent: Tue, May 17, 2016 2:38 pm
Subject: Re: [Chrysler300] Re: F brakes locking up on way to Holland meet

For sure fronts. Don't about rears. Single master cylinder system. Rubber lines to wheels probably 4000 miles max. No cracks. I did just notice the old style hose clamp from the proportioning? Valve to the reservoir had slipped away from the valve, so maybe vacuum leakage? But y not all the time? Wud just have no power boost? Pedal normal pressure otherwise

 

Sent from my BlackBerry 10 smartphone on the Rogers network.

Sent: Tuesday, May 17, 2016 4:19 PM

Subject: Re: [Chrysler300] Re: F brakes locking up on way to Holland meet

 

Are all four wheels locking up, or just the two rear, or one or both fronts?  How old are three rubber hoses, one between the wheel cylinder and metal brake line on each front wheel and one between metal line of body and metal lines on the rear axle housing?


-----Original Message-----
From: lindsey@xxxxxxxxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx>
To: Chrysler300@xxxxxxxxxxxxxxx Chrysler300@xxxxxxxxxxxxxxx <Chrysler300@xxxxxxxxxxxxxxx>
Sent: Tue, May 17, 2016 2:14 pm
Subject: [Chrysler300] Re: F brakes locking up on way to Holland meet

 

Also master cylinder rebuilt about 1000 miles ago.

 

Sent from my BlackBerry 10 smartphone on the Rogers network.

Sent: Tuesday, May 17, 2016 4:12 PM

Subject: F brakes locking up on way to Holland meet

 

My brakes have absolutely seized up twice today, both times from about 25-30 mph. Luckily I didn't get rear ended. Seems like a booster issue as nothing binding in the pedal mechanism. First time stalled the car. Restarted and not locked. Second time I think I caught the side of pedal with my foot and it released. Both times gentle braking. The locked solid. I am in St. Paul minnesota. Anyone know of someone in the area‎ that might be able to help? Or ideas to solve the issue? 

 

Sent from my BlackBerry 10 smartphone on the Rogers network.

 







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Posted by: Lindsey Fuller <lindsey@xxxxxxxxxxxxxxx>


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