QuestionThe brake peddle is hard as can be, can not press it down. took out fuse 8 for breaks did not help what other fuse do i need to check to get breaks peddle to soften so it can be pressed to stop car?
AnswerHello,
No, you have a brake booster issue. The first ting you need to do is give me the year, make and model. If an old Cadillac in the 80s, diesel or gas?
Depending on the car, depends on what to look for. There are two types of brake assist boosters. One is hydraulic known as hydroboost to GM. If the power steering fluid level is low, there will be no assist, or you could have a hydraulic leak-not brake fluid, but power steering (2 separate systems) with the third separate system being anti-lock, which there is no reason to confuse you.
The other brake assist is vacuum. Instead of hydraulic fluid operating it, a large vacuum line is run to it.
Most Cadillacs since 1990 use hydroboost. The way you can tell is under the driver's side of the hood, is that if there are more than 2 steel lines going near the brake master cylinder, you have hydroboost, which requires a professional tech at a service center to work on, (I did not say dealer).
I f you have a big round disc behind the master cylinder at the fire wall with a vacuum line coming out of it, the first ting you check for is a broken vacuum line, however again, this is not something you can service on your own if not a broken vacuum line.
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