brake pedal, meet floor ???? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-08-2006, 10:20 AM
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brake pedal, meet floor ????

Got in the 46 this morning, lite the motor, step on the brake....pedal travels about an inch, (where it usually hits) some pressure there, then continues almost halfway to the floor. This is NOT a good feeling. Truck still stops, but didn't want to take the chance in traffic. No fluid on the floor, M/C is full.

This is a mid 70's vette m/c, mounted under the floor, correct residual /valves, MII calipers, 9 inch rear w small bore (7/8 ) wheel cyl in the rear. Truck has been on the road for 3 years now..never had a brake issue, pedal was always high & hard (no wisecracks )
Thinking i might have a bit of trash in the m/c possibly........

anybody got a clue ????

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Old 02-08-2006, 10:35 AM
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Vacuum booster or not? Sounds to me like the vac booster has gone south if you have a booster.

Vince
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Old 02-08-2006, 10:47 AM
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Or the fluid is bypassing an internal seal in the M/C..............
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Old 02-08-2006, 11:23 AM
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No power assist. Poncho..i was thinking the same thing. Funny thing is i feel some resistance at the initial hit, but it quickly passes through until i get a good pedal. Bypass would explain no fluid leak, just don't understand why all of a sudden..no warning, no pedal getting a little softer etc. Guess it s under the truck this weekend & see what we see
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Old 02-08-2006, 12:43 PM
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Does pumping it help build up pedal...?

I have seem M/Cs give up suddenly all of a sudden.
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Old 02-08-2006, 02:10 PM
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nope....pedal hits the first point of resistance, passes through that, hits the pressure point & holds
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Old 02-08-2006, 02:45 PM
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Definitely either master cylinder or brake cylinder/caliper.

Cheap and easy fix. Pull the drums and see if there is massive leakage (enough to have drained the reservoir). If not, check the calipers at the front for the same evidence. If no evidence is found, its the M/C. Brakes are a remarkably simple system. Its a dual piston that pushes fluid through a hose to another piston. Its either leaking between the two pistons in the M/C, leaking out the back of the M/C, or leaking out of at the wheels.

The symptoms you describe are classic M/C failure issues.
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Old 02-08-2006, 03:08 PM
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Thanks guys...looks like i have a fun & event filled evening ahead of me...
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