Question about 1988 Volvo 240

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88 Volvo 240 Wagon the brake pedal goes to the floor.

We bled the brakes and found the fluid leaking out of a drainage nipple so tightend it and still the pedal goes to the floor. What did we do wrong or is it another problem, master cylinder?

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Posted on Jan 15, 2009

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You will have to bleed them again. air must have gotten in while (nipple) was still loose.

Posted on Dec 06, 2008


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I have installed new rear brake shoes and new wheel cylinders on both sides. I have bled the brakes. Good pedal when engine is pedal at all when engine is started. Bled brakes 4 times.

When engine is running you have a power booster in operation. Without power booster brake pedal will be heavy. With engine running, do NOT press pedal really hard. Just normal firmness. If pedal goes to floor or just too low, it needs bleeding.

Are you sure you did not run the resovior dry?
I would think would not hurt to check the correct procedure for bleeding rear brakes. Here is a YouTube video which should help.

The other possible issue is the master cylinder piston is not sealing well. Might be a good idea to flush it with fresh fluid, but I imagine you have already if you bled it 4 times.

The way I was taught is this. Two persons method. To prevent mess, put a flexible tube over the nipple and drain it to a jar.
Fill resovior with fresh brake fluid. get ready at the bleed nipple with a small closed end wrench, and have helper sit in driver seat. Have helper pump brake pedal (all the way to the floor if it goes there without forcing it) 5 - 8 times, then HOLD PEDAL DOWN. Slowly open the bleed nipple and close it again BEFORE the pedal is released. Helper should keep pressure on as pedal moves down when fluid is released. Repeat until there is no sputtering or bubbles indicating air comming from nipple. Check and fill the tank every couple times to prevent emptying. If it run dry, you have a big problem. You must bleed the whole system at every wheel till ALL air is out.
Hope I have helped.

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Front and rear drum brakes, the pads are ok, but the brake pedal started going to the floor. When I tried to bleed them, the rear bleeder screws broke. So I replaced both wheel cylinders. The rubber... you have stated that you have bled the brakes properly.....was there fluid coming out each bleed nipple as a flowing stream...????

And did you shut off the bleed nipple half way down stroke....?????

If this is all ok, then I would be looking at a failed master cylinder.......and what is occurring is the fluid is leaking from the primary to the secondary within the master cylinder !!!!!

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This sounds to me like classic air in the lines. It is also possible that you are low on brake fluid, but having just bled the brakes this seems unlikely. I think what needs to be done is a re-bleed, ensuring the brake fluid level does not get too low in the process, and then you need to ensure that the bleed nipples and the brake lines are sealed properly. Good luck!

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If the pedal goes to the floor you may still have air in the system.I assume that the pedal was ok before you started and that you may have opened one or more of the bleed screws.
Check the fluid level at the master cylinder.It need to be at the proper level.
You will need to be positive that no air is in the system.If you are not familiar with brake bleeding do not attempt as you may cause more problems.
The use of a clear plastic hose that fits snugly over the bleed screws at the calipers and is immersed into a clear container may be helpfull to see if any air bubbles are present in the fluid.
A bleed kit may be obtained from an automotive supply store.

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2 Answers

Brakes bad even after replacing pads/rotors

You need to replace the master cylinder. If all else is good and the petal goes to the floor, that's really about all it could be.

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