Reply to "Brake Pedal Clunk"

I have only focused on the problem when the car running and the booster is charged with vacuum.

When the problem happens, the pedal clunks immediately and then works normally.

I ran the problem by Wilkinson this morning and we are thinking it could be the master cylinder spring not returning fast enough. If so, it might be letting the booster's push rod (looks like an engine valve) drop out of the socket in the master cylinder. Then when pedal is pressed, it finds the depression in the master cylinder socket (clunking into place) and works normally.

I have another new master cylinder (actually another rebuilt unit) and plan to swap it in and see if that fixes it.

6/16/2011:56 AM

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