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

["kmaniak@xxxxxxx [Chrysler300]" <Chrysler300-noreply@xxxxxxxxxxxxxxx>]

I just thought of something else, especially if you just replaced the master cylinder.  My Ram K uses a remote power brake booster with a manual brake style master cylinder on the firewall.  A manual brake style master cylinder comes equipped with a check valve inside to keep a small residual pressure in the line on a non-power brake equipped car.  When a manual brake style master cylinder is used with a remote brake booster, the master cylinder must be disassembled and the check valve removed before installation.  If the check valve is not removed, the residual pressure between the master cylinder and the slave cylinder of the remote booster will keep the brakes partially applied causing all the brakes on all four wheels to drag.  This would result in all four wheels locking up, or, in a worse scenario, cause a brake to overheat to the point of tire failure and tire fire.  I have heard of more than one letter car burning up from the rear wheels to the firewall from a check valve equipped master cylinder on a remote power brake system.  I am not familiar with the brake hydraulics on a 300F.  Maybe this will help you.

-----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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Posted by: kmaniak@xxxxxxx

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