Lotus Elise Service Notes page 292

MANUAL GEARBOX
DESCRIPTION - REVERSE BRAKE
A reverse brake mechanism has been introduced to
the PG-1 gearbox, and is operated by the selector
fork mechanism, which stops the input shaft from
rotating prior to the engagement of reverse gear and
provides a quiet and smooth engagement of reverse
gear, providing the vehicle is stationary.
The reverse brake utilizes the 3rd/4th synchro hub
for its operation. The 5th/reverse shift piece, which is
secured to the selector shaft by a roll pin, and
incorporates two guide lugs with two machined
grooves that form a platform for a lock plate. The
inner face of the lock plate is angled approximately
at 45°, with two machined flanges either side of the
lock plate which are positioned in machined grooves
in the guide lugs. A return spring, which biases the
lock plate against the stop surface, extends along
the step at the front of the lock plate, with the two
free ends of the spring held in position by two
Taptfte' screws either side of the shift piece. A lug
on the 3rcV4th selector fork has a machined face at
an angle of 45°which acts as a ramp when in contact
with the angled face of the lock plate. 1st/2nd
selector shaft has a machined abutment surface
located below the detent grooves, the abutment
surface being the area of contact for the lock plate.
8 DESCRIPTION AND OPERATION REVISED: 12/97