Re: {Chrysler 300} 300K Ram Brake Problems

Thanks, Mike.

I was aware that the Booster vacuum hose is designed differently and that is what I asked for at Napa. But it's worth a check to ensure I was given the right hose. I did remove the air breather element and cleaned it the best as I could without destroying it when I reinstalled the booster. From what I recall the pedal wasn't going to the floor but real close. If I was only losing the power assist I was thinking the brakes would hold the car, it would just be a hard pedal like manual brakes. I haven't been out there yet this year but hope to this week as this is a non-treatment week and we are finally having some great weather in North East Ohio. I will look into the fluid level before and after to rule out leaking into the booster.

Mike Cortel

On Monday, May 9, 2022, 10:19:58 PM EDT, mwl1967 <mwl1967@xxxxxxx> wrote:

Mike sorry about your health and car challenges. Can you clarify what you mean by the pedal "starts bottoming out"? Does it go all the way to the floor or does it lose all power assist? If the pedal isn't bottoming out against the floor and you're just losing power assist you might have used the wrong type vacuum line from the engine to the booster. That five foot long line will warm up and collapse on itself, cutting off vacuum and hence all power assist. Then you'll feel like you've got no brakes. You need a vacuum line designated for brake boosters. What about the air breather for the booster? It's under the battery tray. If that's clogged up with nearly 6 decades of crud you'll have similar problems.

My thoughts are that if it were air in the lines needing bleed the brakes would feel better after repeated pumping but you've got it the other way around. Have you checked fluid level when pedal feel is good? Then again when pedal is bad? If you're seemingly losing fluid but have no leak it's possible that the slave cylinder is leaking internally into the booster itself.

Hope this helps somewhat.

Mike Laiserin

Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------

From: 'Mike Cortel' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>

Date: 5/9/22 9:47 AM (GMT-07:00)

To: chrysler-300-club-international@xxxxxxxxxxxxxxxx

Subject: {Chrysler 300} 300K Ram Brake Problems

Hi to all

A little background. Approx 2 years ago I was having leakage at the master cylinder and the brakes felt weak. I figured it was time for a rebuild. I removed both the master cylinder, the remote brake booster, and the slave cylinder and took them to Power Brake Exchange in Pittsburgh for rebuilding. They did find a broken spring in the remote booster and were able to replace it as well as the additional seals and such. They provided a test report and it showed the booster providing 300 psi? (I can not find the paperwork at this time but I believe that was the number.) I got everything back home and got back together. I also replaced the front wheel cylinders, shoes, and front hoses. Also, replace the vacuum line from the intake to the booster with the correct type of hose. I followed the service manual for the bleeding order of the system more than once.

Here is the problem. I have brakes when the car first starts up. But after a couple of stops, the brake pedal starts bottoming out and the brakes do not hold. I was so frustrated and fed up that I just put the car away.

In the meantime, I have become a cancer patient and I would really like to get this fixed and possibly enjoy the car this spring/ summer while I can.

I have considered taking the car to the local Chrysler dealer whose ownership is into Mopar Muscle as I am not sure how much I can still do.

Any thoughts or suggestions are appreciated as well as any shops in Ohio that may be able to work on this.

Thanks in advance

Mike Cortel

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