Front wheels won't lock up under heavy braking.....

[Billhilly]

Hi Gents,

As the title says, long story but, it has come to my attention that the front’s aren’t locking up! And, don’t know if they ever did (!)

72 K2500, about 12k miles on all new brake components. 285/75/16 tires (33”).

Up front is stock booster, master cylinder, and calipers/rotors, no proportioning valve. Plumbed from the front of the MC, straight to the calipers.
Rear is Eldorado calipers on Chevy rotors, with a Wilwood proportioning valve.
EBC ‘Yellowstuff’ pads all round.

I can lock up the rears, but recently I played with the PV and only got worse results. I understand that by default the rears will be easier to lock up, less load etc. I don’t understand with all stock front components where the issue lies….


I started out with a 1” MC and it braked fine ish, but had a reeeeeally long pedal! Long enough to make your eyes go big wondering if it was actually going to stop! So I swapped to the stock (1 1/8th”) MC and got a ‘normal’ pedal. Thought things were ok……..

Any ideas as to where to start looking?! I’m all blank stares down here!