Quote:
Originally Posted by leecorrell
Unfortunately, I feel like I lost braking power with this setup. Granted, I haven't fully bedded in the new pads/rotors just yet, but initial feel is not what I was expecting. I was planning to eliminate my power brake booster and go with manual brakes. However, I decided to try it out without making any changes to the booster or master cylinder first. I expected the brakes to be super touchy and just about throw me through the windshield under light braking with the booster still in place. But no, it feels like I lost braking power compared to the stock drum setup. I think the master cylinder is likely a 1" bore since that should be what was original for power drum brakes, although it is an aftermarket replacement master cylinder. I think I'm going to need to go down in master cylinder bore size, but I'm concerned about a smaller bore having enough volume to work with the large caliper pistons. Anyone have experience or suggestions on that?
Thanks,
Lee
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As spec'd on a 70's c10, these calipers would likely have been paired with a 1.125" bore master cylinder. These D52 calipers have huge pistons and need a lot of fluid to work.
It seems like you're making assumptions regarding the size of your master cylinder and it also seems like your brake booster is likely the booster found on a power drum brake application?
The power drum brake boosters were usually small and don't offer as much power assist as a booster mated to a power disc car.
It sounds like you need to decide at this point if you want to keep power brakes or go manual. If you decide to keep the power brakes, you likely want the larger 1.125" master cylinder. If you want to go manual, you can work with the 1" master cylinder, but you may want to consider a 15/16" bore master cylinder to help out with leg pressure.