In article >,
says...
> 1993 Saturn sedan with ABS, 1.9 DOHC
>
> HI,
>
> It appears master cylinder is leaky- no fluid leaks, but pedal mysteriously
> drops while sitting at a light sometimes, slight release of foot pressure
> then press down and to the floor it goes.
>
> I picked up a Chiltons book and this appears to be a PAIN to do.
> Apparently, the entire ABS assembly, including internal gears, need to be
> removed just to access the bolts to disconnect master cylinder. It does
> look like I could handle it but there are a few major problems:
>
> The book says "The abs modulator pistons are normally in the home or top
> position. In this position, the modulator drive gears are under spring
> tension and will turn during disassembly if not unloaded. The sudden
> rotation of gears and release of tension could cause injury if done without
> extreme care. It is recommended that the pistons be run down and the
> tension released prior to removing the brake control assembly..."
>
> Question 1) How do a "extreme care" OR am I expected to buy some $$$$ scan
> tool to program the pistons down?
>
> Well, one question is enough for now. Thanks for any help,
>
> Dave

ScanTool? Nah not for taking stuff appart...But bleeding the ABS system?
Yeah you might need one then unless the book shows you another method. I
dont have anything on 93 Saturns unless 98's have the same brake system.