ir3333
Well-Known Member
does that single reservoir have a residual pressure valve?
that could be another disc brake deal breaker...
that could be another disc brake deal breaker...
does that single reservoir have a residual pressure valve? that could be another disc brake deal breaker...
I would like to see positive proof that the formuls s with FACTORY installed, not a dealer installed option, Disc brakes had a single res. MC. what I have seen is double or drum brakes on the 65 formula s cars.
Pre 66 vehicles including mopars equipped with disk brakes absolutely did come from the factory with single master cylinders. The 65 formula s disc brake equipped cars are just one example. Safest set up. No , that's why it was changed in 66 . For the sake of having an original look he is not sacrificing any more safety with this disk conversion than with driving with original single mc and drum brakes. I'm Sure the breaking feel and stopping distance has been improved with this conversion. Oldschoolcuda
The problem with the single reservoir master cylinder is that it is very dangerous. THe factories all realized this as cars were evolving and changed it. Yes, they work fine. Until they fail. There is NO backup. Modern dual reservoir master cylinders are dual reservoir. In other words, they have two tanks to hold fluid. If there is a leak somewhere in the system, there is always a backup. With the single reservoir master cylinder, a leak anywhere in the system results in pedal to the floor, and zero brakes. None of the factories ever used the single reservoir master cylinder with disc brakes. Ever. Yes, it can be done. Yes. It works. But it is not safe.
..when you apply the brakes,the piston movement distorts the o ring and moves about .005. ..when the pressure is released the o-ring returns to shape pulling the piston back that same .005 for pad clearance. if you use a residual valve on a disc system you will have constant contact and drag on the rotor. newer drum brake wheel cylinders have springs to preload the cups so residual valves are no longer needed.
65-66 Dealer installed Kelsey-Hayes by authorized dealers. It's in the manual
No one is being a dick...........
And? Does the fact that it's "in the manual" make it not dangerous compared to a dual reservoir master cylinder? Does the fact that it's "in the manual" make anything I said untrue? Nothing about it being "in the manual" means that it's a safe alternative to a dual reservoir system. Nothing. No how. Nowhere. No time. You're just arguing for the sake of argument, now. The dual reservoir system is FAR SUPERIOR to ANY single reservoir system. PERIOD, END OF STORY. That is fact. Plain and simple. When you kill someone you love because you are hard headed, you will realize it was you who was narrow minded.
I agree w/ 64_Barracuda on the single MC and anybody can use Google Images to verify the 1965 factory disk/drum design. Dual reservoir and disk brakes are separate issues and separate fed mandates (~1968 & 1974), though disk/drum cars benefit more from a dual MC. My 69 Dart had a dual MC drum/drum and the pedal went to the floor with no dash warning. I expect the "imbalance valve" in most cars is rusted in place so doesn't warn you when you loose half the braking. Even w/ a single MC there is a backup in the e-brake (plus engine braking), though rears-only greatly increases stopping distance. My question is the photo of post #1. It appears the rotor and hub are separate pieces. True, or just a machining line? Also, if the 1976 BBP rotor had SBP holes added, why don't we see the BBP holes? I thought 1973+ rotors were an integral rotor/hub, or was that just in later after-market replacement parts? Re prop valve, by selecting the correct rear wheel cylinder bores, you might get away without a prop valve. Factory prop valves (inside the "combination valve") were a fixed ratio, which may not be right as people change parts like tires, so perhaps many cars drive around non-optimal. Even with a single-pot MC, you can add an adjustable prop valve in the tube to the rears. It is really a separate issue. Re residual valves, I understand today they are only for hot rodders who mount the MC below the floor. Wheel cylinder kits since ~1970's have cup springs that serve to keep air out as the pistons retract. I don't understand post #37 about the residual valve affecting pedal travel. Its purpose was to keep pressure on the system to keep air out by keeping the wheel cylinder piston rubbers tight against the bore. The shoes will retract until they contact the stud above the wheel cylinder, regardless. 10 psi residual pressure cannot beat the shoe springs. The self-adjusters are what affect pedal travel.