Clicking from brake pedal when accelerating

[hikermike]

I have a 2003 Sequoia with 341,000 miles on it. Finally replaced a hissing brake booster this weekend. Braking is fine and the hissing is gone bur whenever I accelerate there is a clicking sound (like a solenoid) that comes from under the dash at a rate of 1/sec and at the same time the brake pedal jumps. If I put a tiny bit of pressure on the brake pedal or slow acceleration a bit, it goes away. Put the electrical connections all back in their rightful places. Any ideas out there?