'88 5KSQ (Type 44) Brake Problems

[Christopher Ritchie]

The brake pedal on my '88 5KSQ will slowly go to or near the floor if I hold 
pressure on it.  The warning light switch on the servo for the Autocheck 
system is disabled.  The car has a new pump and pressure accumulator 
("bomb").  In a normal car, I would suspect the master cylinder.  But what 
is the "brake servo"?  That is the thing between the pedal and the master 
cylinder.  What does it do?

At about 120K miles, I am ready to replace the master cylinder.  No rebuilds 
for this critical part.  Should I also replace the servo?


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