last week i mounted a 72 mustang manual master cyl under the floor of my 53 F-100. i used the stock pedal and pushrod, and just made a simple mounting bracket off the old one that bolts to the side of the frame. the pedal will compress the piston in the master all the way with no fluid in it, so it should be ok (if im wrong here please let me know- i would much rather find out before i drive it). i also have a 2lb rvp for the front (volare)and a 10lb rvp and an adjustable pressure valve for the rear(explorer-drums). now that the master is under the floor, it sits backwards from its intended position. both sides of the reservoir appear to be the same size, but the ports are different. does it matter which one goes to the front (the rear port now) or can i hook them up to the end of the truck closest to the port (*pic*)? just trying to keep it clean and simple, an maybe i'm paranoid, but i want the brakes to work, at least a little bit.... if i have missed anything at all please feel free to add. thanks-p
the master is from a disc / drum car, i didnt realize one size was bigger 'till i went back to the shop and looked because the fella at the parts store had threaded adapters in it for 3/16 lines. i just assumed they were the same size to begin with. i guess i will get back out there today and give em the ol switcharoo. many thanks guys rp (breeders thankin you too )
[Yes it matters which one goes to the front and rear. The rear brakes should be the first to activate followed by the front. This is determined by which is the primary and which is the secondary on the master cylinder you are using. [/quote] Negative on which axle is activated first. You want the front brakes to engage first. If the rear brakes lock first in a panic stop the rear will be leading the frontend so fast your ass won''t have time to pucker. If you have an adjustable proportioning valve in the system take the car out to a deserted road or parking lot and do panic stops from about 40 mph. Adjust the valve so the front brakes lock just before the rear to avoid the old endo- switchero. If you've ever experienced rear brake lockup first you'll never forget it, imagine how doing it in the rain will give your pacemaker a real workout. Frank
Fab32- thats what i was thinkin.....but then again, this is first setup i have done. normally just rebuild the stockers and go.
WOW, if you have discs up front with rear drums you will need a master cylinder made for that application. The reason for the two sizes of reservoirs is the volumn of fluid the disc brake callipers use compared to the rear drum pistons. The master cylinder contains two pistons, one for the rear brakes and one for the front. The large reservoir is normally the primary reservoir for the front discs. It will be mandatory you use a porportioning valve the is used to adjust the bias between the front and rear brakes.The discs have more stopping power as 70% of the effective braking is on the front. The porportioning valve is used in the rear brake line that supplies both rear brakes and is adjustable to decrease the pressure applied to the pistons in the rear brakes. one method of adjusting this valve is to get on a dirt road and applie brakes hard enough to skid the tires. Compare the distance of the skid marks and adjust the valve to get the skid marks pretty close in length. Dont get crazy it won't take much speed to do this. The best way to install the brake system is with a combination valve in stead of the adjustable valve. Good luck
Master cylinders are designed so that pressure is applied to the rear brake first. (the weak spring side). As soon as pressure is built up on the rear it allows pressure to be built up on the fronts ( the strong spring side)
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