Nelson and List:
I've been monitoring the post on brake bleeding and PDWA centering. I've a
question for you. I recently had the brakes serviced and bled at a local
shop. I had them install a new PDWA switch that I had on hand. When I got
the car home and reconnected the ground wire from the harness to the switch
the brake light came on. This leads me to believe that the switch needs to
be centered.
I've considered just removing the switch and manually repositioning the
piston. Can this be done without introducing air into the system? Or will
it be necessary to rebleed the system? Any input is appreciated.
Thanks and best regards,
Walt Fogle
'69 TR6, CC30689L
Woodinville, WA
Nelson wrote:>
>I've have always been able to reposition the PWDA piston by removing the
>switch on the top and using a sharp object such as an awl to push the
>piston. We tried to use a small screwdriver to hold the piston in position
>through the switch hole while finishing the bleeding job but it still
>managed to move and had to be repositioned several times. When we were all
>done the youngest member of the team observed that the tip of the switch
>would probably have held the piston in position. I think he is right.
>
>To minimize the PDWA problems when bleeding, don't have the engine running
>so that there is no boost from the servo and avoid applying heavy pressure
>to the pedal till most of the air is gone. I usually do a quick first cut
>bleed to both sides and then go back and get the last bit of air.
>
>Nelson Riedel
>Granville, OH
>76 TR6 (assembling after new paint)
>68 TR250 (next project - new paint)
>70 TR6 (all the parts in a pile ready to assemble)
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