After looking at the MC itself it has a JB6 on it but part stores around me dont even list that for my truck, which i no you cant always go by that. I just want to make sure that it wont cause any harm to the rest of the braking system if i had put a JB 6 on and it might have been a JB 5 or lower. This is my first tango with brakes on these trucks so bear with me lol.
The most critical difference between the various brake systems is at the wheels. The higher the duty rating, the bigger and stronger are the components used to create the friction used to slow the vehicle. Additionally, the friction components used with higher rated brake systems are designed with greater surface areas. This enables them to:
1. Withstand/absorb the increased heat energy generated by the braking process associated with larger, heavier vehicles.
2. Ultimately dissipate/transfer that energy to the surrounding atmosphere.
The capacity of the MC
is part of the equation as well. Since the friction creating parts used in a higher rated system are bigger, so too must be the hydraulic assemblies (i.e. wheel cylinders/calipers) used to actuate them.
So it also follows that, since the wheels are fitted with larger brake actuating equipment, the bore/piston diameter of the MC must be also be increased accordingly. This is so the MC is able to deliver the increased
volume of hydraulic fluid required by the heavy duty actuators.
Pressure in a hydraulic braking circuit is mainly dependent on how hard you push on the brake pedal. Tubing used in all automotive braking systems is rated for 3000 psi. When you apply the brakes in a normal fashion (like slowing for a stop sign or coming off the highway) most drivers press the brake pedal hard enough to develop 800 -1000 psi. Even in the event of a panic stop, the most the system will see is about 2000 psi.
My point is; you should have no qualms about installing a MC with a heavier duty rating than was originally spec'd for your truck. It won't over pressurize your system and cause a blown line.
