Have a 2001, 300M 3.5L 70000 miles. While driving, brakes were normal then suddenly half of the brake system failed. The brake pedal had to be pushed almost to the floor to achieve braking. No warning lights of any kind and no sign of fluid leaks, reservoir was full. Pumping does not achieve pedal pressure. Replaced master cylinder and bled IAW instillation instructions and Haynes repair manual. Problem still persists. The way the car is driven probably never activates the ABS. I'm thinking one of the solenoid valves in the valve block assembly has failed??? Anyone seen this before or have any ideas. Thanks

 

Welcome to the forum. You have posted your question in the new members forum where people introduce themselves. You might have a better chance of getting a meaningful reply by posting your question up in the forum for Chrysler 300 owners, further down the page. good luck.

 

You may have to bleed the ABS system in conjunction with a Bi-directional scanner. Some cars, like Buick's, require a scan tool to actuate the solenoid to bleed the system. Not sure if 300M's have those but just a thought.

 

Thanks guys, found the problem! The new master cylinder that I bought was defective. Thanks for the input.