4WHEELOFFROAD.COM 4-WHEEL & OFF-ROADOCTOBER 2019 73
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WRITE TO: Nuts & Bolts, 4-Wheel & Off-
Road, 831 S. Douglas St., El Segundo,
CA 90245
FAX TO: 818.566.8501
EMAIL TO: [email protected]disc conversion is not only possible, but there
are a couple of ways to get the job done.
Just about all of the disc brake conver-
sions on the market utilize either light-duty
(^1) ⁄ 2 -ton front calipers (JB6) or heavier-duty
(^3) ⁄ 4 -ton calipers (JB7). The JB7 calipers
were used on heavier-rated trucks and use
different brake pads, but they physically
interchange with JB6 calipers in terms of
mounting. In addition to these options, you
could also use 1976-1978 Cadillac Eldorado
calipers, which have a parking brake func-
tion built into the caliper. At one time these
factory calipers were nearly unobtanium,
but these days a couple of different com-
panies manufacture these calipers, making
them much more common and affordable.
Although they don’t offer quite the same
holding power, these calipers are a viable
option for those who want to retain the use
of an emergency brake or need one to pass
state inspections. You might need to get
a little creative with the cable routing and
length to reach the calipers, but Eldorado
calipers offer a fairly simple bolt-on solution
and are compatible with just about every
conversion kit on the market.
A second option is to move the parking
brake to the back of the transfer case. You
didn’t mention which transfer case you have,
but if it’s the original one in your 1977 truck
then it’s likely an NP203 or NP205. A few dif-
ferent companies offer a driveline-mounted
emergency brake: Northwest Fabworks
(northwestfab.com), High Angle Driveline
(highangledriveline.com), and TSM Manufac-
turing (tsmmfg.com). Though there are some
slight variations, all three of them add provi-
sions to mount a thin rotor and a mechanical
caliper to the rear driveline at the transfer
case. These will require some driveline
modifications in addition to modif ying the
stock emergency brake cables, but they are
reported to offer superior holding power and
are a viable alternative to tracking down the
Eldorado calipers. Either of these options
should satisfy local laws as well as those
concerned about having the added safety of
an emergency brake.
SPC has Adjustable Control Arms for:
Toyota Ford Nissan
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