Buick Park Avenue

Why does brake pedal go to floor on 1991 buick park avenue?

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2009-11-17 16:51:43
2009-11-17 16:51:43

First, make sure the master cylinder is filled with brake fluid. If it is low, there may be a leak somewhere in the brake lines or a brake cylinder. If the master cylinder is bad, you can normally pump the brakes up, but the pedal will slowly sink to the floor again. The master cylinder needs to be replaced or repaired.

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The parking brake is set by pushing, with your foot, the parking brake pedal on the left side of floor area. It is released by pushing with foot again.


Use your right foot and apply pressure to the brake pedal.


Small pedal on the left of the brake pedal - activates the rear brake to hold vehicle


When you press and hold the brake pedal it will slowly move to the floor. It can also have a catastrophic failure and go straight to the floor with no stopping ability at all. If you hold the brake pedal down and it slowly moves to the floor any at all, replace the master cylinder.


usually they will leak out the back by the booster, your brake pedal will slowly go to the floor at stops or the brake pedal will go right to the floor when pushed.


Something is impairing the brake pedal to go to the floor. Only a mechanic can tell you what is happening.




I suspect it is because the pedal return is weak. My Park Avenue does the same thing. I can lift the pedal with very little pressure from my toe and the indicator goes off.


You are probably losing both brake fluid and pressure through either a wheel cylinder or the Master cylinder . You will need to have a trained mechanic look at why you are having the loss of a brake pedal .


ouch,are brakes adjusted correctly/ sit in vehical and pump pedal to get a full pedal,then hold pedal to see if it bleeds off and goes to floor,if it stays, replace shoes and pads if it goes to floor, there is a fluid leak somewhere is there brake fluid in the resevoir/ are there any brake fluid leaks ,check backside of wheels there is a brake fluid pump, on the chassis rail about level with the front of the front door on the left side.if this pump is bad your pedal will go to the floor




Probably your emergency brake pedal. Try lifting up on your e brake pedal and see if id goes out.


Most likely it is either the brake light switch, under the dashboard, connected to the brake pedal or the turn signal switch inside the steering column.



Sounds like the brake switch underneath the dash connected to the brake pedal is stuck. Look under the dash at where the brake pedal is connected and move the pedal with your hand and you should see an electrical connection or contact mounted to the pedal.


No, a busted brake booster will not cause the brake pedal to go to the floor. It will however cause the brake pedal to be extremely hard to push. A defective master cylinder will cause what you describe. Replace the master cylinder and bleed the brakes. It can because it happened to me. The booster lost vaccum and the pedal went to the floor. Sorry, you are wrong. The only reason the pedal went to the floor was because the master cylinder failed. The brake booster only boosts the pressure on the master cylinder and allows you to not have to push so hard on the brake pedal. Cars of yesteryear did not even have a brake booster and they stopped just fine albeit you had to push the pedal allot harder than with power brakes. A failing brake booster will not cause your pedal to go to the floor although it might cause it to go lower than normal before the brakes apply. As long as the master cylinder is good you will still have brakes, but you will have to really push hard and might even have to pump them up in order for them to stop the car.



sounds like overheating of brake line, either from hot pavement, or cat converter. causes brake fluid to boil and loss of pedal.



The brake pedal will sink to the floor when applied and the brake fluid reservoir remains full.


You will be adding brake fluid to the reservoir often.The brake pedal won't feel firm.The brake pedal may sink to the floor as you are applying steady pressure.Do a visual inspection of the brake lines looking for that wet spot.


hold your left foot on the brake and mash the gas pedal to the floor and have fun!


to the left of your brake pedal there should be a little hatch. its behind that



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