master cylinder difference?
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Posting Guru
Joined: Jan 2003
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From: Munroe falls, Ohio
master cylinder difference?
i need a new one and advance auto has two kinds, one for under 8500lbs gvwr, and for above 8500lbs. my truck is 7300lbs gvwr, what is the differance between them? and can i upgrade to the bigger one?
Logistics Pro
Joined: Jan 2002
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From: GANS
master cylinder difference?
I just got a new master cylinder for my f-250.
the main differences is probably- dual piston calipers on the front, and 3" wide drums in the back, whereas the 8500 and under only have single piston calipers and 2.5" drums
on the master, it looks like it holds more brake fluid. the booster probably gives it more mechanical advantage.
all in all, its not going to do you any good unless you upgrade your brakes. it might even cause problems. they do that for a reason in the factory ya know.
the main differences is probably- dual piston calipers on the front, and 3" wide drums in the back, whereas the 8500 and under only have single piston calipers and 2.5" drums
on the master, it looks like it holds more brake fluid. the booster probably gives it more mechanical advantage.
all in all, its not going to do you any good unless you upgrade your brakes. it might even cause problems. they do that for a reason in the factory ya know.
Logistics Pro
Joined: Jan 2002
Posts: 3,739
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From: GANS
master cylinder difference?
yeah, i know my 84 2wd & 85 4x4 and all kinda different fittings on them.
on the Master cylinder, the rear drum fitting is a 5/16 inverted flare that goes to 3/16 line, the front discs are normal 3/16. the proportional valve, has one 5/16 for the drum input, a 3/16 for the front. the output for the rear is like a huge fitting, like 3/8 or 7/16, and the fronts are normal 3/16. talk about a phreaking pain to find adapters.
on the Master cylinder, the rear drum fitting is a 5/16 inverted flare that goes to 3/16 line, the front discs are normal 3/16. the proportional valve, has one 5/16 for the drum input, a 3/16 for the front. the output for the rear is like a huge fitting, like 3/8 or 7/16, and the fronts are normal 3/16. talk about a phreaking pain to find adapters.
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Joined: Jan 2001
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From: Virginia
master cylinder difference?
Be sure to always try to get the right master cylinder. If it needs adapters, they usually come with it. Otherwise take it back.
The master cylinders can have different bore diameters. This gives different pressures and fluid volumes to the system. Get a master with a smaller bore than the system was designed for, and you will get more braking power, but the pedal will travel farther to the floor. Get one with a bore that is too big, and you get less pedal travel, but less pressure too.
The master cylinders can have different bore diameters. This gives different pressures and fluid volumes to the system. Get a master with a smaller bore than the system was designed for, and you will get more braking power, but the pedal will travel farther to the floor. Get one with a bore that is too big, and you get less pedal travel, but less pressure too.
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