Topaz FWD L4-140 2.3L CFI (1987)
atmospheric port and reopen the vacuum port. Since this force is in opposition to the force applied to the brake pedal by the driver it gives the driver a
``feel'' of the amount of brake applied. The proportion of reactive force applied to the valve plunger through the reaction disc is designed into the
Master-Vac to assure maximum power consistent with maintaining pedal feel. The reaction force is in direct proportion to the hydraulic pressure
developed within the brake system.
PUSH ROD ADJUSTMENT
Adjust the pushrod as outlined in the General Service section of this chapter.
TROUBLESHOOTING
Hard Pedal or No Assist
1.
Air cleaner element clogged.
2.
Control valve faulty.
3.
Defective diaphragm.
4.
Worn or distorted reaction plate or levers.
5.
Cracked or broken power piston or levers.
6.
Internal or external leaks.
Brakes Grab
1.
Control valve defective or sticking.
2.
Bind in linkage.
3.
Reaction diaphragm leaking.
4.
Worn or distorted levers or plate.
No or Slow Release
1.
Pushrod adjustment incorrect.
2.
Linkage binding.
3.
Return spring defective.
