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Old 11-18-2005, 04:06 PM
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Help!Brake pedal goes to the floor

Hi all,I need some help with my brakes.The other day I decided to look at the pads and see how much life was left on them.Not much so I decided to change all of them.Front and back.Well I changed them and for the life of me I cant get the pedal to come back up and give me a good feel.When I pump the brakes with the car off the pedal gets hard.Start the car up and hit the brakes and the pedal goes to the floor.And the car barely brakes.And I get a HISS sound the minute I touch the pedal.I have bleed the brakes with a friend and the pedal feels o.k.The minute we start the car up there goes the brakes to the floor again and with a bad hiss.I think that it's the power booster but would like to hear if anyone agrees.The car is a 77 Buick skylark.Please help my brakes suck and I cant drive my freshly built 350!

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Last edited by babygene41042; 11-18-2005 at 04:11 PM.
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Old 11-18-2005, 04:37 PM
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my guess would be the master cyl.....unless you pulled the vacuum hose off the booster and have no vacuum...
you can test the booster with a mighty vac....should hold vacuum
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Old 11-18-2005, 05:34 PM
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I took the booster off and cleaned it and checked the diaphragm.It was fine.I then hooked it up to the vacuum on the car without installing it just to see what it would do.I started the car and it pulled the pedal lever in.Then I pumped the lever to act as if I was pumping the brake.It seemed to lose pressure and it didn't pull the lever back in.Does that mean it has a leak?
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Old 11-23-2005, 03:28 PM
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Let me think..... mmmmmmmmm..

1) It worked.....

2) You took it apart....

3) Now it doesn't work........

mmmmmmmmm????????

I give....
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Old 11-23-2005, 04:50 PM
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I had Simular problem with 2 vehicles

I had problems with my 95 Bommeville and 74 Firebird a fews years ago. The pedal would pretty much go to the floor with little braking power on the Bonnie. First of all check the inlet for your vacuum on the motor. I had this plug up on my 74 Firebird and I had no vacuum and little braking power. Cleaned it and braking was back. Have the master cylinder checked. Sounds to me like the fluid is getting past the rod that applies the pressure and this will cause the pedal to go to the floor with little braking power. Check the hose or replace it this could be a contributing factor too. Well I hope this helps.
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Old 11-23-2005, 05:19 PM
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Is the fluid going down, maybe you broke a brake hose. If your not loosing fluid you may have damaged the master cylinder if you didnt open the bleeders before compressing the cylinders, this is a common mistake most back yard mechanics make, assuming you have disks on the front. The pedal will always be hard with the engine off once the vacuum resevoir is depleted. If you dont have a leak try adjusting the rears, perhaps they are too loose. Are you sure you got the correct replacement parts and the rears are assembled correctly. There is a lot of room for mistakes on rear brakes. If you had any of the cylinders disconnected or open, you will need to bleed the brakes to get the air out of the lines. I would guess your booster is working since the pedal ets easy to push once the engine is running. You need to go back to basics, check for leaks first, try to determine if its the fronts or backs giving you the issue, then locate the problem.

Brakes are nothing to mess arround with, if you dont know what you are doing, find someone who does, it could mean your life !!
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Old 11-23-2005, 09:33 PM
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xntrik what are you talking about?I said I had the problem before I removed the booster?And yes I completely removed the calipers before I compressed them back in.I've had this hiss sound for sometime now.I'm going to replace both the booster and the master cylinder.If it's not to expensive.
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Old 11-23-2005, 09:59 PM
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Quote:
Originally Posted by babygene41042
xntrik what are you talking about?I said I had the problem before I removed the booster?And yes I completely removed the calipers before I compressed them back in.I've had this hiss sound for sometime now.I'm going to replace both the booster and the master cylinder.If it's not to expensive.
I apologize for misunderstanding.

I re-read your original post and I didn't understand that you had this identical problem before you installed the new pads...

A bad booster will NOT make the pedal go to the floor.

Last edited by xntrik; 11-23-2005 at 10:05 PM.
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Old 11-24-2005, 05:07 PM
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Thanks for all your help guys.I went today and changed the booster and the master cylinder and the car stops great!And does not make any noise or hiss!
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