9-27, DOUBLE-CHECK VALVE MAINTENANCE (Continued).
Do not remove double-check valve until pressure
is fully exhausted from all reservoirs.
For location, refer to locator illustration (para
9-5 e. thru 9-5 j,). Double-check valves are attached
to the rear of the secondary air reservoir and to the
engine side of the brake pedal valve on all models.
There is a double-check valve on the drivers side of
the brake pedal valve on all models except the M918
and M919. All models use a double check valve with
stoplamp switch attached to the engine side of the
firewaIl near the brake pedal valve. The procedure
below is general and may be used to service any of
these double-check valves.