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Thread: Brake line pressures
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07-06-2011 #26
New pressure data for the experts.
OK for you brake experts-new data for you. Took completely out the prop valve. Plumbed rear brakes(2.5" Gm metric calipers 11" rotor) to the "front" brake port of the GM 1" Vette MC. Plumbed front Wilwood 4 piston 1.75"Dynalite to the "rear" port. 6.7:1 pedal ratio.
Previous alot of pedal travel,little effort fronts would develop 1000psi , rears 500 at full pedal alot of leg pressure. Both would got to 400 at the same rate then the front would keep climbing.
Doing some research some of the early GM MC had about a 60:40 output front/rear. All the Wilwood tandems have 2:1 output volume their new aluminum or their Chrysler aluminum.
So after swapping the lines, gravity bleeding and pressure bleeding all 4 corners and both gauges the rear now goes to 850 and front 800.But both slowly drop 100-150 psi. Pedal is better as far as effort but still takes almost all the travel to build that psi.
I'm still thinking especially now since the pressure slowly drops it's a bad MC.
1978 Black Trans Am 455 Edelbrock heads [email protected] through mufflers on pump gas
1981 Trans Am 400 stock type motor
79 Camaro getting a 500" 695 hp IA2 Pontiac motor
1965 GTO project car
470ci/Chevy dual quad 409 604 HP 64 Impala SS project
2004 Pulse Red GTO
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