When a classic was equipped with factory power brakes (Treadle-Vac) the power brake pedal pad was twice as large as the non-power brake pedal pad. The large pedal pad has "POWER BRAKE" imprinted on the face of the pad. This larger pedal pad tells everyone you have power brakes and it just looks cool. When installing an aftermarket power brake booster on a Tri-Five, a non-power brake pedal assembly must be used, giving you the smaller pedal pad. The Treadle-Vac brake pedal swing arm which has the larger pedal pad is tough to find and will not work with the aftermarket brake booster. Classic Chevy has now developed a formed bolt-on plate that will allow the use of the larger power brake pedal pad on a non-power brake pedal swing arm.

Parts List
1955-57 Power Brake Pedal Conversion Kit
1955-57 Brake Pedal Bushings

Tools Needed:
Drill and 1/4" Drill Bit
7/16" Wrench

Time Frame
1 hour

Image #1: When installing an aftermar ket power brake booster like our PIN 57-132416-1 on a Tri-Five car the non-power brake pedal assembly must be used. The non-power brake pedal has the small peda l pad which is th e same size as the clutch pedal pad

Image #2: If the car had factory powe r brakes the brake pedal pad was twice as big and had the words "Power Brake" imprinted on the pad.

Image #3a, 3b: The Brake Pedal swing arm assembly does not need to be removed to install the new power brake pedal conversion, but our swing arm needs new upper bushings so we will remove ours. The swing arm pivotson a steel sleeve attached to the swing arm support under the dash with a 5/16" X 3/4" bolt, nut and lock washer. With this bolt removed, the pivot sleeve and brake pedal arm can be removed from the support

Image #4: The brake pedal ratio is different be tween non-power and power brakes. To achieve the proper brake pedal ratio and pedal travel a new 3/8" hole must be drilled 1" lower than the original hole in the arm.

Image #5a, 5b: The power brake pedal conversion kit is designed to be bolted in place, but can be welded if you wish. The kit includes the large power brake rubber pad, the steel pedal plate and mounting hardware.The mounting plate is curved to match the contour of the original pedal plate.

Image #6a, 6b: The holes in the new plate are offset slightly to move the pedal to the left of the steering column allowing for more brake pedal to gas pedal clearance. Clamp the pedal plate in place and using the holes in the plate, drill two 1/4" holes through the original brake pedal plate.

Image #7a, 7b: Using the supplied 1/4" carriage bolts, nuts I and lock washers, bolt the new plate to the original pedal plate. Here you can see the slight offset in the new pedal plate.

Image #8: The P/N 57-132459-1 bushings at the top of the brake pedal swing arm simp ly press in place.

Image #9a, 9b: Now simply install the new rubber pad on the new large pedal plate and reinstall the swing arm. Now the car will ha ve a factory power brake pedal pad and look super!