What would cause the brake pedal to drop when the engine is started

Asked by Blue1966 Nov 22, 2014 at 06:37 PM about the Ford Thunderbird

Question type: Maintenance & Repair

After replacing the master cylinder on a 66 T Bird the brake pedal now goes to the floor
when the engine is started, this must be an issue with the booster

2 Answers
15,725

Larry answered 9 years ago

Check all your vacuum lines to the booster. There is probably a "Y" connector and one line may be off or loose.

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