[supersport71]

Was just wondering if anybody has converted from power to manual brakes on a S10. I purchased a master cylinder that is supposed to be for manual brakes but it looks identical to the power MC and even has the same casting numbers. I'm thinking the internals may be different but am unsure. Anyhow, I would like to hear from anybody who may have done this conversion so I know what needs to be done. Thanks....

[302 Z28]

The piston diameter is different for a manual master cylinder, also the cavity where the pushrod goes is deeper than a master cylinder for power.

Vince

[Triaged]

The difference is in the step bore diameter. The manual brake one is smaller.

The other thing you need to do is swap in some manual brake wheel cylinders in the back.

[supersport71]

Thanks, I kinda figured the internals were different even though they look the same from the outside. I have a 9" ford rear with drums so I think I'll be ok with the rear brakes.

[dh79]

There's a bit more to it than just switching the master cylinder. I've recently converted my 81 grand prix to manual brakes using all S10 parts. I've posted pictures in a thread on this forum. Here's the thread:
S10 brakes on G body

Luckily for you, it should be possible to take all the parts you need off a wrecked S10. You'll probably need the backing plate for the firewall, a pushrod for the manual master cylinder, and the retaining cup to keep the pushrod on the back of the master cylinder. Take a look at my previous thread if you want to see pictures of this stuff.

Also, the S10 pedals might have different attachment points for the pushrod. My G body had a hole for power brakes and a hole for manual brakes. You could either change the stud to the other hole, or get a brake pedal from a manual S10 with the stud already in the correct hole.

It shouldn't be a very difficult swap, especially if you can find a wreck to strip parts off.
dh

[supersport71]

I did check out your swap the other night after I made my original post. Looks like you did a great job! I have been unable to locate a S10 that has manual brakes so far, seems most had power but I know they made them so I'll keep searching as it will be the easiest way to make the swap. Thanks for the info.