After
years of developing unique brake products, Classic Performance has developed
their most innovated product yet. The all NEW MCPV-1 which combines
the master cylinder, double adjustable proportioning valve, removable
metering valve and stop light control all in one compact light weight
unit, available for Disc/Drum or Disc/Disc applications. The MCPV-1
solves many problems associated with trying to do the same thing with
four or five separate pieces being plumbed together. The MCPV-1 is the
master cylinder, proportioning valve, metering valve and stop light
all in one package (Fig. 1). The unique shape allows it be located on
the firewall, under dash or on the frame just about anywhere. It’s
approximately the same size as the ever-popular Corvette master cylinder...only
260% lighter (Fig. 2).
The MCPV-1 has two circuits...front
and rear. The front circuit of the MCPV-1 contains the metering valve,
which is required on cars that have disc brakes on the front wheels
and drum brakes on the rear wheels. The metering valve does not allow
any pressure to the disc brakes until a threshold pressure has been
reached. The threshold pressure is low compared to the maximum pressure
in the braking system, so the drum brakes just barely engage before
the disc brakes kick in. Having the rear brakes engage before the front
brakes provides a lot more stability during braking. Applying the rear
brakes first helps keep the car in a straight line.
The rear circuit of the MCPV-1 contains
the adjustable proportioning valve and the maximum rear pressure adjustment.
The adjustable proportioning valve controls the balance of pressure
between the front and rear brakes. For example, if the adjustable proportioning
valve was set to 70 percent and the brake pressure was 1000psi, the
front brake would get 1000psi and the rear brakes would get 700psi,
regardless of what type of brakes a car has. The Maximum Rear Pressure
Adjustment controls the maximum rear pressure allowed to the rear brakes
to help prevent rear wheel lock up. If the Max Rear Pressure Adjustment
is set to 500psi and the adjustable valve set at 70 percent, the front
brakes get 30 percent more until the rear reaches 500psi.
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