I clipped my 49 Ford Tudor sedan with a 90 S10. Fits GREAT! I ***UMED I would just use a standard GM (old) style master cylinder to work with the newly mounted front suspension. BUT, then I started looking at the differences between the newer brakes/master cylinders and found out that these new "quick take up" calipers won't work with the older GM master cylinders. This article enlightened me.... http://www.mpbrakes.com/uploads/do***ents/lowdrag.pdf Now what do I do? I can't run a newer (S10) master cylinder/booster because the booster is too damn big to fit on the firewall. I can't run an older 7 inch booster, with the newer master cylinder because the hole in the booster isn't large enough. Can the newer calipers be replaced with older style calipers? If so, what year/make? Is there a newer booster that is smaller? Is there another solutions? Offer up your opinions/thoughts/knowledge. Thanks in advance, Rich
Thanks for the link. likely you are not the first to deal with this. have you talked to tech guys at mpbrakes.com & 911brakes.com?
My 47 has a 80 camaro clip and a 92 firebird rear. I used the master that came with the rear and made my lines in the front with a metric fitting on one end and a SAE fitting down at the rubber line. no leaks going on the 5th year. hope that helps.
Not all newer boosters are the large ones, there are smaller diameter dual diaphragm boosters on 87-88 monte carlos (same brakes as S10) and 93 up F bodies as well. These all use the newer style aluminum master cylinders.
Good info. I'd really like to shy away from the newer master cylinder/booster. 1. It's kinda ugly 2. I've already purchased a new 7 inch dual booster and older style master cylinder.
So, does anybody know of an older style caliper (non quick take up) that will fit the S10 spindle? If there is such a thing, I think my problems would be solved. Rich
I wish I could remember the exact caliper & part #, but I believe it was something like a 78 Monte Carlo. Take your current calipers from the S10 to the auto parts store and have them give you a set from a 78 Monte and compare them. When I went through this whole dilemma, I did this and found calipers that were identical in every way (even the casting #) but were from a year prior to the 'quick-uptake' design. I bolted them up and sure enough, fixed the problem instantly.
My fourty has s10 calipers,7' booster,under the floor tci pedals,67 mustang master,i'm 4disk, brakes, Les but they also have mustang 2 disk. Hope this helps.
Thanks Cleatus. From what I have been able to determine, GM came out with the "metric" caliper in the 78 Monte Carlo. But they didn't switch to the "quick take up" on these calipers until 1980. Rich
I would look in a street rod catalog for a mini booster and master for the late model brakes. or maybe you can go with a hydroboost system. I am working on one now on a '48 Lincoln. They are a pretty cool setup. Won't work of course if you don't have power steering, maybe you could just mount the pump and byp*** what is needed for the power steering box.
Don't be confused - its simple! The only difference in the QTU calipers was the seal design, which provided more piston retraction force to pull the pads away from the rotors to reduce brake drag. The QTU master provided an initial slug of fluid to quickly take up the extra retraction to avoid a low pedal. Any metric caliper is the same except for the seal - so use a pre-90 metric caliper. Its been a while ( I was the brake engineer....), so I can't remember if the machined groove in the caliper body was changed - perhaps all you need to do is rebuild the caliper with the earlier seal - I might try that and see how my pedal is.
Just throwing this out there.... On my 49 GMC, I'm running a newer MC (QTU) and big brake kit (70 Camaro calipers I think - non QTU) on a MII suspension, and it has EXCELLENT brakes. I've autocrossed this truck, and it did quite well. Rich
I deal with S10s a lot..use the stock calipers from the 90 S10 and a master from a 98-04 S10, it has the smaller bore that will fit any aftermarket booster, 9", 8", 7" what have you. Youll also need a proportioning valve of some sort depending on your rear brakes. The 96 and older S10s had them hanging under the master.
Just checked the rockauto catalog because I was curious, but they list the same PN calipers for a 1978 and 1988 monte carlo, so they must all be quick take up units? Or not? Anyone know when they came into use for sure? If 1980 was the crossover year I bet you would still get a quick take up caliper due to the fewer amount of early cores being out there. Rockauto does show a different master cylinder PN for a 78 vs 88.
OOPS - sorry, meant pre-80. I suspect the aftermarket services all with the non-QTU design - will work with the QTU master, and increase in drag not significant on an olded car.
So, I'm thinking 78 Monte Carlo calipers and old style GM master cylinder and booster. Should I still run the S10 proportioning valve? No prop valve? Is there a difference between prop valves used on QTU MC vs. non QTU MC ? I really do appreciate the input, Rich
G body (later Monte) and S10 share many front suspension and brake parts.There's quite a few master cylinders and boosters available.Best booster is a single diaphram but it's larger diameter. The smaller dual diaphram booster is often too sensitive for many drivers. I don't think you need a booster if using a one inch bore master cylinder. Many guys,me too, run GM disc brake retro fits with no booster.The brakes take a bit of foot push but nothing serious.
Tese guys are really good too http://www.inlinetube.com/PDF%20catalogs/Chevelle%20Only%20Catalog%20150.pdf
Prop Valves are the same. I'd use a prop valve from a car - the S-10 uses a low pressure cut-off because of the light rear end (250 psi vs: 350-430 psi for a car). Personally, I usually use an adjustible prop valve and taylor it to the car.
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