Time for the next update, the last few weeks I spent time designing, fabricating and assembling a power brake solution for the SL-C.
The general approach is to use a 2010 Camaro SS brake booster and master cylinder and mate it to the Tilton pedal assembly and preferably the RCR adjustable pedal bracket.
Here is a video and overview of the adjustable pedal bracket and Tilton 600 series pedal assembly...
Here is the follow on video to the design, fabrication, and assembly of the power brake solution...
Considering I planned to mount the brake booster on the end of the extended footbox, the first thing I did was mock up the extended footbox in plywood to visualize and mount the various components...
I selected the Camaro brake booster since the combination of the brake booster and master cylinder depth is only 9” and also matches the Camaro SS calipers that come with the SLC.
The three major problems I think need to be solved are the following(There May be more, but these are the three I know of):
1)Drive a brake booster from a floor mount pedal
2)Adjust the pedal ratio from manual to power, go from 5.x:1 to 3.x:1
3)Position the brake booster and master cylinder to clear the fans
To solve items 1&2 I found a brake booster bracket used in 1965-1974 Mopar cars. The reason I decided to go in this direction is that back in 1965, Mopar used the same brake pedal with a single hole for both manual and power brakes. They then mated a brake booster assembly which used a slave brake lever/pedal which adjusted the brake pedal ratio for power brakes. Very similar to what we need to do in order to leverage the Tilton 600 series pedal assembly.
Here is a pic of the Mopar brake booster assembly...
Here is some math behind how the Tilton and Mopar bracket combo would effect the overall brake pedal ratio....
This may be a good starting point and prove to be to low a pedal ratio. If so, it can easily be modified by moving the holes on the slave brake lever/pedal to raise the ratio to suite my preference.
Here are some parts I fabricated...
Nylon bushings to mount a shoulder bolt through the Tilton brake pedal where the balance bar goes, also made a bushing for the Camaro Brake booster rod so I could use the 3/8” clevis pin to mount the brake booster actuater rod to the slave pedal/lever.
Nylon is easy to machine, is hard and slippery and makes for great bushings...
Slides right into the brake pedal....
Fabricated a mounting box to mount the slave brake pedal/lever...
It mounts right behind the adjustable pedal bracket and I notched it for a slight overlap....
Lastly, fabricate a brake pedal actuator rod which can be used in conjunction with the adjustable pedal bracket. This enables moving the pedals backward or forward and it all works nicely with th power brake assembly.
Drilled the holes first....
Then put it on the mill to shape...