Re: {Chrysler 300} 300K Rear Brake Size
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Re: {Chrysler 300} 300K Rear Brake Size



Thanks for all the replies. We did confirm the car in question has the 2.5" brakes. Went to a junkyard yesterday to get parts off a '64 300 sport 4-door hardtop. This Pick Your Part yard tries to help customers out by removing all but one lug nut. Of course on Chryslers, they don't seem to know that they have left hand threads so they totally destroyed one nut on the rear and gave up. I wasn't able to get it off. Pulled the right side wheel and the drum had been separated from the hub and the holes egged out. Still need to find a pair of good drums for my friend in Australia.

On Sat, Sep 10, 2022 at 10:40 AM <kmaniak@xxxxxxx> wrote:
Nick:

All 300/300K except ram came standard with 11x2.5 rear brakes with standard suspension.  Standard suspension had 5-leaf rear springs and no front sway bar.  Heavy duty suspension was optional on all 300/300K and standard on ram cars.  The heavy duty suspension included 11x3 rear brakes, 7-lear rear springs and front sway bar.  On a side note, heavy duty suspension was not available on Newport/New Yorker.

On a car with 11x3 rear brakes, the backing plates have a 1/2 inch offset towards the centerline of the car, use the same 11x3 shoes and used on the front.  The drum is deeper and has an interior machined surface that is 3.5 inches deep.  The standard 11x2.5 drums have a machined surface only 3 inches deep.  That's how you tell the difference between the two drums.

Some people who don's know better have installed 11x2.5 brake shoes into an 11x3 brake system.  When this is done, the inside edge of the brake lining protrudes 1/4 inch outside the drum when installed.  I know this because someone installed 11x2.5 linings in my K with 11x3 inch rear brakes.

Chris the KMANIAC


-----Original Message-----
From: Nick Taylor <nicksgaragesd@xxxxxxxxx>
To: Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Sent: Fri, Sep 9, 2022 7:36 pm
Subject: {Chrysler 300} 300K Rear Brake Size

Are the rear brakes on a 300K 11x3 or 11x2.5?

Thanks, Nick
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