85 C30 hydroboost replacement?

[SCOTI]

Originally Posted by prateroad

Thanks for the reply, my main concern would be if the vacuum booster would just bolt up. I thought it would have the same bolt pattern. Is the pushrod the only difference or is the pedal different also? I have a 67 C50 that has 20" wheels and it has a big vacuum booster on it, it's a pretty big vacuum chamber though.. They changed them later to a remote hydrovac that mounts under the cab.

It's a direct bolt-in swap going from Hydraboost to vacuum brakes on 73-87's. The pedals have different pivot points for the rods so different ratios.

You either have to relocate the pivot bushing on the existing pedal to the correct spot or get a pedal w/the pivot bushing correctly located. Either option requires pedal removal.