89 Si Soft Brake Issues
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89 Si Soft Brake Issues
Hey guys, I've searched and tried every suggestion and I'm at a loss so here we go.
When I got my Civic the brake pedal would go straight to the floor when trying to brake. Everything I've read said that typically is the master cylinder or simply air in the lines. So first I bled the brakes. Didn't fix it. Bled them again just in case, nada. Picked up a reman master cylinder, bench bled, bled the brakes again, pedal still goes to the floor. Figured I would try returning the master cylinder and getting a brand new one just in case the mc was bad, nope. Installed the new one and bled the brakes again and still have a soft pedal.
So I went on to checking the vacuum lines. Pulled the lines with the car on and they have vacuum. After driving up and down the block a few times attempting to brake, I turned it off, let it set for 5 minutes and pulled the vacuum line again and air wooshed out so there was still pressure there.
Now I'm just sitting in the driveway banging my head up against the steering wheel. Help! Thanks guys.
When I got my Civic the brake pedal would go straight to the floor when trying to brake. Everything I've read said that typically is the master cylinder or simply air in the lines. So first I bled the brakes. Didn't fix it. Bled them again just in case, nada. Picked up a reman master cylinder, bench bled, bled the brakes again, pedal still goes to the floor. Figured I would try returning the master cylinder and getting a brand new one just in case the mc was bad, nope. Installed the new one and bled the brakes again and still have a soft pedal.
So I went on to checking the vacuum lines. Pulled the lines with the car on and they have vacuum. After driving up and down the block a few times attempting to brake, I turned it off, let it set for 5 minutes and pulled the vacuum line again and air wooshed out so there was still pressure there.
Now I'm just sitting in the driveway banging my head up against the steering wheel. Help! Thanks guys.
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Re: 89 Si Soft Brake Issues
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#6
Re: 89 Si Soft Brake Issues
When she is pumping, does the brake pedal get hard for her?
I just realized how dirty that sounded.
btw, your wife gets the wife-of-the-year award for this ****. Pumping brakes on a hooty-EF ain't exactly glamorous.
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Re: 89 Si Soft Brake Issues
She said it felt like it was getting harder with each pump.
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#8
Re: 89 Si Soft Brake Issues
If the pedal isn't getting hard when she pumps it, like hard enough where she can't push it all the way to the floor, then there is an air leak somewhere or the master cylinder still has air in it. You might have to take it back off and bench-bleed it again. That air won't come out any other way.
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Re: 89 Si Soft Brake Issues
If the pedal isn't getting hard when she pumps it, like hard enough where she can't push it all the way to the floor, then there is an air leak somewhere or the master cylinder still has air in it. You might have to take it back off and bench-bleed it again. That air won't come out any other way.
#11
#12
Re: 89 Si Soft Brake Issues
Did you make progress, Eric? All the way to the floor is what you want. The first couple of strokes will require you to pull the pedal back up, but it should build up pressure pretty quickly. Make sure the brake fluid level never dips out of the reservoir. That'll just put air right back into the master cylinder.
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Re: 89 Si Soft Brake Issues
Did you make progress, Eric? All the way to the floor is what you want. The first couple of strokes will require you to pull the pedal back up, but it should build up pressure pretty quickly. Make sure the brake fluid level never dips out of the reservoir. That'll just put air right back into the master cylinder.
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Re: 89 Si Soft Brake Issues
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Re: 89 Si Soft Brake Issues
Did you make progress, Eric? All the way to the floor is what you want. The first couple of strokes will require you to pull the pedal back up, but it should build up pressure pretty quickly. Make sure the brake fluid level never dips out of the reservoir. That'll just put air right back into the master cylinder.
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Re: 89 Si Soft Brake Issues
So I've now changed the rear shoes and wheel cylinders as well. Shoes were shot and cylinders were leaking. Still have a soft pedal.
#18
Re: 89 Si Soft Brake Issues
I guess you are down to the booster and prop valve, then. I've never replaced one of those, so I can't help you there. Sorry. I still can't think how a booster would cause this, but I'm not a pro.
You'll have an entirely new brake system when you're done. This is probably why the guy sold it.
You'll have an entirely new brake system when you're done. This is probably why the guy sold it.
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Re: 89 Si Soft Brake Issues
I guess you are down to the booster and prop valve, then. I've never replaced one of those, so I can't help you there. Sorry. I still can't think how a booster would cause this, but I'm not a pro.
You'll have an entirely new brake system when you're done. This is probably why the guy sold it.
You'll have an entirely new brake system when you're done. This is probably why the guy sold it.
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