1955.2 Chevy Truck LS1 Front Ford 8.8 Rear 4 wheel Disc - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-13-2011, 01:00 PM
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1955.2 Chevy Truck LS1 Front Ford 8.8 Rear 4 wheel Disc

Hey guys, I am trying to do all of my homework on the braking system for my 1955 Chevy truck. I have installed a 1980 Monte Carlo front clip onto the factory frame, and have upgraded the front suspension components and brake system to the LS1 disc brake setup. In the rear, I have a 1996 Ford Explorer rearend with the factory disc brake setup. I have a frame mount under cab power brake setup with 8" booster, and the Corvette style disc/disc dual master cylinder, with 1" piston. The reservour will be below both the front and rear caliper locations, so I plan on installing 2 lb residual valves on the front circuit and the rear circuit. I am considering the GM style self-adjusting proportioning valve instead of the adjustable proportioning valve. I found the formula for piston area X linear travel of the piston = volume change somewhere online. It quoted the following, "Since the master cylinder is much smaller in area than the caliper pistons, it has to travel much further than the caliper pistons to take up a given volume change at the caliper. The LS1 caliper has a total of four front caliper pistons of about 1.75" diameter. If all four caliper pistons move, for arguments sake, 0.1". Thats a change of volume of 0.962 in^3. If the MC is 1" diameter it will have to move 1.22" to take up the slack. " Being a brake system rookie, I was wanting to make sure that my components will work together and have the right capacity. I don't have any specifics on the Ford calipers and volume of the rear calipers. If anyone has any similar brake components or advice, I would greatly appreciate it before I finalize my system and start bending brake lines. Thanks

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Old 07-13-2011, 03:16 PM
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maybe someone else will chime in here, but i think your over thinking this.
we have installed 8 piston calipers on mustangs without changing anything else.

i post here to save your self trouble down the road.
use a remote reservoir. repeat: use a remote reservoir.
plain and simple it will save you a bunch of work down the road.
my 58 apache has an 03 mustang hydroboost power brake setup on it.
everything mounted under the floor in stock location.
took my truk on the HRPT 2011 last mth.
brake pedal got soft in indy, had to find a shop with a lift to fill the reservoir.
drove the rest of the tour with a soft pedal which caused the mc to fail.

i am now retrofitting the mc for a remote reservoir .
parts from a nissan quest or ford villager fit the mustang mc perfectly.
but in my research to find parts the corvette mc is easy to retrofit to a remote reservoir.
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