Quote:
Originally Posted by ntsqd
I understand that desire, but I've seen posts on going to various larger bore m/c's w/o rear discs.
IME going to larger bore to satisfy the needs of the brakes that do maybe 20% of the high speed work is going at things the wrong way. Make the fronts work the way you want (pedal feel & travel distance), then chose and adjust the choice of the rear parts to work without changing the front set-up. Because of the inter-relatedness of the front & rear systems I realize that it isn't as easy I as I make it sound, but it is the correct priority sequence - it just may take several iterations to get there. Toyota doesn't hit it spot-on the first time, every time with a new vehicle. They will have to try different combo's in the prototype stage. No reason to think that we will get it right first time out of the box.
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I installed a 1" bore Minitruck MC when I did the 4Runner caliper upgrade, and it was fantastic as far as pedal travel and feel. I still had the stock drums, which I had broke down and inspected to make sure they were still well within limits as far as wear, and properly adjusted.
Then when I upgraded to rear discs, the pedal feel was still okay, but travel was more than I cared for. This was with Eldorado calipers (with the built in ebrake). I'm now using Monte Carlo calipers, which appear to have a larger bore than the Eldo calipers, which increased pedal travel even more. Unfortunately, I don't believe there is a larger bore Toyota MC available that will bolt onto our boosters.
While rooting around the intertubes, I saw that Sky Manufacturing sells a Toyota/GM adapter that allows you to install a GM MC from a hydroboosted vehicle onto the Toyota vacuum booster (I'm figuring that the pushrod length is what's dictating the need for a hydroboost MC as opposed to one from a vacuum boosted vehicle. Anyhow, I looked at the different GM MCs available that should be compatible with the adapter, and found one for an '86 1-ton that has a 34mm bore. It sounds large, but there are smaller (and yes, even larger) bores available, so I figured since that's about middle of the road, I'd use that as a starting point. I'm going to try the adapter with the 34mm bore MC and eee how well it works. Like you said initially, the key is to finding the right MC for the front brakes, and then going from there. For gradual, low speed stops I'm not concerned about front/rear brake proportioning, but for situations where I'll have to dynamite my brakes, I'll leave my Wilwood proportioning valve installed on the rear line so that I don't get rear wheel lockup before the front even engage.
It'll be a trial-and-error process, but I'm hoping the end result will be the best brakes you can end up with on a 60 series, properly proportioned and everything.