Brakes won't stop my Valiant 100
My advice is focused on you having a hard pedal but ineffective stopping power,,,,if that isn't the case then Ignore me. But,,,The nine inch brakes just don't don't work well with any wheels larger than the original 13 inch rim. i know, as I have a 71 demon slant six that would stop only very poorly, with 14x5.5 Rallye wheels and 205/70x14 tires. (the brakes were all newly rebuilt or new NOS as well)
So, I went back to some 14 inch 4.5 with 195/75 x14 and the braking improved greatly. but, once the original 13 inch x 4.5 rims and 185/75x13 tires went on it stops on a dime, just like back in the day (1970)when I also had a 68 valiant coupe . If I convert the car to a 340, all that will go away asap!!!
it is all about weight and mass, as the larger and heavier the wheel, the more brakes you need to stop. that is why the 68/69 V8 darts/Valiants had 10 inch brakes with 14x4.5 inch rims..V8 A/C cars got 14x5.5 rims with D70-14 tires, with 340 Torsion bars and 10 inch brakes as standard equipment.
The demon looked great with the rallye wheels, but it had a super hard pedal and poor stopping power. the car now is sadly back to stock rims and hubcaps.
But it stops perfectly.
My advice is focused on you having a hard pedal but ineffective stopping power,,,,if that isn't the case then Ignore me. But,,,The nine inch brakes just don't don't work well with any wheels larger than the original 13 inch rim. i know, as I have a 71 demon slant six that would stop only very poorly, with 14x5.5 Rallye wheels and 205/70x14 tires. (the brakes were all newly rebuilt or new NOS as well)
So, I went back to some 14 inch 4.5 with 195/75 x14 and the braking improved greatly. but, once the original 13 inch x 4.5 rims and 185/75x13 tires went on it stops on a dime, just like back in the day (1970)when I also had a 68 valiant coupe . If I convert the car to a 340, all that will go away asap!!!
it is all about weight and mass, as the larger and heavier the wheel, the more brakes you need to stop. that is why the 68/69 V8 darts/Valiants had 10 inch brakes with 14x4.5 inch rims..V8 A/C cars got 14x5.5 rims with D70-14 tires, with 340 Torsion bars and 10 inch brakes as standard equipment.
The demon looked great with the rallye wheels, but it had a super hard pedal and poor stopping power. the car now is sadly back to stock rims and hubcaps.
But it stops perfectly.
