Brake booster and ITB's on 16v

[jondee86]

Quote:1. Brake vacuum from side of throttle 1 behind butterfly (big hole)

2. Fuel return to tank (entry) [from regulator]

3. Fuel return to tank (exit) [to fuel tank]

4. Brake vacuum from side of throttle 4 behind butterfly (big hole)

5. Idle Speed Control Valve (ISCV entry)

The brake vacuum is taken from throttle 1 & 4 via a side port. They are
summed by a T-joint before connected to the brake servo. Since throttle
4 is far from brake servo hence it is connected to another pipe then to
the T-joint (not shown).

As can be seen, the factory thought that pulling vacuum from throttles
one and four was a good solution. Obviously, pulling vacuum from all four
throttles would be better. Likewise, keeping the brake vacuum separate
from the FPR and MAP signal vacuum is also a good idea

Picture and text courtesy of my-acoustic.com

http://www.my-acoustic.com/Car/car_section.htm

Cheers... jondee96