Mazda RX-7 - CHASSIS;BRAKE SYSTEM; Explanation and Description of Competition Parts

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CHASSIS/BRAKE
SYSTEM
Specifications
Category
Item
Comp. spec. Stock
spec.
Foot
brake
conlrol
parts
Pedal
ratio
4.77 4.77
Pcwer assist diaphragm diameter 7.5" o.u
Master cylinder diameter 15/16"
&
1"
1 3/1 6"
Front brake
Type ventilated
disc
solid
disc.
Rotor thickness
25mm 18mm
Caliper type
opposed
f loating
cyl. dia. 2.1t8" 2.0"
Effective radius
'102
mm
90
mm
Friction
pad
material
ss-100. ss-123
F-50
thickness 9.7 9.0
Rear brake Type solid disc drum
Rotor
thickness 10mm N/A
Cylinder diameter 1-3/8"
1 1/16"
Effective
radius 93
mm
100
mm
Friction
pad
material
ss.100,
ss-123 J-6020-C
thickness 9.0
4.0
Proportioning valve
line
pressure
range
30-100
kg/cm'
l.
Explanation
and
Description
of
Competition Parts.
A. Foot brake control
systom.
Compared
to the stock
unit,
the com-
petition
assembly
has
greater
effi-
ciency through
a
larger servo
assist
vacuum diaphragm and a
larger mas-
ter cylinder diameter.
1. Power
assist,
for right-hand
drive:
4352 49
800
for left-hand drive: 4352 43
800
As a result of increasing the
as-
sist
vacuum
diaphragm
from
6.0"
to 7.5"
in
diameter, the clutch
master
cylinder must be moved
25 mm to the left.
Master cylinders,
1":4352 49 400
15/16": 435243400
Two
master
cylinders are availa-
ble to
suit
individual
preferences
and
driving styles.
Master
cyl inder
bracket,
4352
43 160
This bracket
is
used to facilitate
remounting the
clutch
master
cyl-
inder
due
to the increased
size ot
the
power
assist vacuum
dia-
phragm.
B.
Front brake.
1.
Rotor,435233251
This rotor is
25
mm
thick, compar-
ed to the
stock
thickness
of 19
mm,
and
has
a
larger
effective
radius, 102 mm
instead
of 90 mm.
2. Wheel hub,4352
33 061
This
wheel
hub has
a
larger
bear-
ing
capacity and special rotor
attachment
bolts.
R: 4352 33 610
L:4352 33 710
Compared
to
the stock unit, this
caliper has
opposed
pistons,
larg-
er cylinders and is
assembled
to
the
steering
knuckle
by
two
bolts.
4. Air
duct,
R:4352 33
260
L:435233270
This duct
provides
cooling air
for
the
brakes.
3.
2.
3.
35