Friend of Mine,has put a disc brake kit in a 72 Nova "all new parts".He ended up with a soft brake pedal,He ended up replacing all parts twice with no improvement.He clamped off the rears with no change.He clamped off the fronts and got a hard pedal,the bleeders are up on the calipers,the hoses are good.I think He said the master has a built in residual valve ?
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1972 Nova disc brake conversion trouble.
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HTIH (Hope The Info Helps)
Jeff
Get your facts first, and then you can distort them as much as you please. Mark Twain
Note: SDC# 070190 (and earlier...)
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The Disc Front Brakes not NOT require a Residual Valve as DEEPNHOCK (Jeff) said. The Drum Rears do.
Also on A GM Car, the rears probably require a Proportioning Valve.
Time to start over, correctly.StudeRich
Second Generation Stude Driver,
Proud '54 Starliner Owner
SDC Member Since 1967
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Are the flex hoses new?59 Lark wagon, now V-8, H.D. auto!
60 Lark convertible V-8 auto
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62 Champ 3/4 ton 5 speed o/drive
62 Champ 3/4 ton auto
62 Daytona convertible V-8 4 speed & 62 Cruiser, auto.
63 G.T. Hawk R-2,4 speed
63 Avanti (2) R-1 auto
64 Zip Van
66 Daytona Sport Sedan(327)V-8 4 speed
66 Cruiser V-8 auto
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While the disc do not "require" a residual valve, it sure helps make the brake pedal action nice.
It keeps the pads close to the rotor for quick braking action.
On my hot rod Conestoga, I used 2lb. valves on both ends, (under floor master cylinder) and the brakes work fantastic. No discernible drag, the car will roll easy with no brake pedal actuation.
I've done the same thing to my driver Conestoga. Wilwood calipers (GM copies in aluminum) in front, Ford calipers in the back, under floor Wilwood master cylinder, with 2lb. valves for both front and rear. The two reservoirs are on the fender well.
Mike
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