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Will08
09-03-2008, 02:52 AM
The Haynes manual for a Chrysler Town & Country does not show any special precautions when changing breaks with ABS. I read/heard that depressing the calliper can damage the ABS breaks. Does any bleeding of the break lines need to occur prior to depressing the calliper?

admin
09-03-2008, 03:33 PM
Hi Will08,

We responded to this exact question yesterday. Here's the response:

You can go ahead and follow the procedure in the Haynes manual without worrying about damaging your ABS system.

Some mechanics come from the school of thought that by pushing the pistons back into their bores, contaminants in the system will be forced up into the ABS hydraulic actuator and foul the valves. They advocate connecting a bleeder hose to the caliper bleeder and opening the bleeder as the piston is pushed back. There's nothing wrong with doing this, but there's always the chance that air could be admitted into the system. For this reason the brakes should be bled if this method is used. Furthermore, there's no guarantee that ALL of the fluid being displaced by the caliper piston will exit the bleeder hose; some of it will flow upstream towards the ABS actuator anyway.

The factory service manual doesn't advocate that method, and here in our workshop at Haynes, we've never had a problem with an ABS system after pushing the caliper pistons into their bores, as your manual instructs.