Updating to bigger drum brakes

Standard

CONVERTING TO 10 X 2 1/2 INCH DRUMS

Upgrading from 10 x 1 3/4 brakes to 10 x 2 1/2 brakes can be done relatively easily.

A 1984 Lincoln Town Car has the right sized backing plates. The same 7/8 inch brake cylinders are used for 10 x 2 1/2 as on the 10 x 1 3/4. There is a difference in the offset for
the bigger brakes so new drums are required. The backing plates from the 84 Lincoln bolt right up to the axle housing and have the same holes as the original backing plate for the wheel cylinder, parking brake cable, etc. Buy the hardware kit for the same backing plate.

Other Ford donors are

  • 68-70 Mustang
  • 80-89 Full size Fords (Custom, Galaxie, Crown Victoria, Country Squire)
  • 66-75 Elite, Fairlane, Torino
  • 69-71 Station Wagon
  • 63-65 Station Wagon
  • 66-74 Ranchero

NOTE: Not all of these cars always came with 10 x 2 1/2 brakes, but some of each model
listed above do. Also, when you go to buy parts, make sure the drums you buy are the right sized 5 lug bolt pattern.

REAR DRUM BRAKE COMPARISON:

The stock rear drum brake dimensions for a V-8 equipped Mustang measures 10 diameter x 1 3/4 wide.

The 57-59 Ford big-car rear end’s drum brakes measures 11 x 2 wide.

For large 9-inch axle bearing housing applications only, the drum brake size can be
increased to 11 x 2 1/4 by pirating a rear set of drums from a 65-67 Ford Galaxie. This will
give a brake swept area increase of 1/2 inch over-all combined.

For even more stopping power, the addition of the 1960 model T-Bird rear drums will give you a dimension of 11 1/32 x 2 1/2

NOTE: An increase in rear brake dimensions (or even when installing larger wheels and tires) should also include the installation of a manually adjustable proportioning valve, to compensate for the extra leverage. Ideally, the rear brakes should lock up just after the
fronts lock up for steering control reasons.


Some reference articles / videos

 

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2 thoughts on “Updating to bigger drum brakes

  1. Hi, Bob
    I have a 1966 Mustang with an 8″ small bearing axle. Just wanted to clarify, are you saying that the 1984 Lincoln backing plates will bolt up or is the just for 9″ rear end?
    I would love to upgrade.

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