Greetings,
Does anyone know if there were different brake pedal assemblies for manual and power brakes? I converted the manual brakes in my '68, 350 auto to power using the correct power booster unit. The brakes work fine with the exception of very low speed applications, when they tend to lock up very easily. Is this typical for power brakes or might there be another brake pedal arm which give less mechanical advantage?

best regards, Robert Hanley

Is it disc/drum or drum/drum? Did you replace the master cylinder as well? Rears locking up? Did you use the lower hole on the brake pedal arm?

As near as i can tell from my cars, the pedal assemblies are the same.
The rod is ajustable.

I should have included the fact that this is a drum brake car. Master cylinder was replaced when the booster was added. It feels as if front and rears are locking up evenly. Only saw the one hole in the pedal arm for the clevis pin.

Robert

Thanks for checking. As I recall, the rod can only be adjusted for pedal height.

There are two holes in the pedal. One hole is used for the manual and one is used for the power as stated above, you also need the proportioning valve for the power brakes.

The "proportioning" valve, actually the brake distribution switch, is the same for all '67-69 Firebirds, both power and manual, disk and drum brakes.

Disc brakes have additional components, power drum do not. The upper hole in the brake pedal is for non-power, lower for power brakes.

You also should remove the brake pedal return spring when installing a power booster.

Vikki,

Why should you remove the return spring when installing a power booster? I have a spring on mine, and things work fine. Is there a wear and tear issue if you leave the spring on?