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

Booster is on firewall above single master. Reservoir under fender

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Sent: Tuesday, May 17, 2016 5:34 PM

Cc: lindsey@xxxxxxxxxxxxxxx; Chrysler300@xxxxxxxxxxxxxxx

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

Scooter465: That would be true for a master cylinder attached to a firewall mounted brake booster, a combination used since 1962. But I believe the 300F uses a remote booster and manual brake style master cylinder bolted directly to the firewall, because of clearance issues with the ram tubes.

-----Original Message-----
From: scooter465 <scooter465@xxxxxxx>
To: kmaniak <kmaniak@xxxxxxx>
Cc: lindsey <lindsey@xxxxxxxxxxxxxxx>; Chrysler300 <Chrysler300@xxxxxxxxxxxxxxx>
Sent: Tue, May 17, 2016 3:08 pm
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.

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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

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From: kmaniak@xxxxxxx

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

To: lindsey@xxxxxxxxxxxxxxx; Chrysler300@xxxxxxxxxxxxxxx

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.

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From: lindsey@xxxxxxxxxxxxxxx

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

To: Chrysler300@xxxxxxxxxxxxxxx Chrysler300@xxxxxxxxxxxxxxx

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?

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