Brake issue 93 civic hatch

[ammo]

So i have a 93 auto hatch. While holding the brake at a red light the brake pedal sometimes will sink and the hatch moves. So is it a master cylinder issue or booster issue? How can i trouble shoot it to find out which.

Thanks.

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[college man]

see if this helps.

http://www.ericthecarguy.com/faq/solving-brake-problems

[Author]

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