[Francesko35oZ]

If you're finding ONLY the RF is leaking after a four-wheel bleed, check the hard line for cracks and consider the caliper and/or seals as being suspect.
Are you doing this brake assessment, or are you using a trained technician?

i work as a mechanic but i fix engines all the time and i don't know too much for brakes.so you're telling me the brake booster is okay?

 

[dkmura]

i work as a mechanic but i fix engines all the time and i don't know too much for brakes.so you're telling me the brake booster is okay?

Never said the brake booster was OK. But if only one corner of the Z seems to have a lot of air in the brake line, it makes sense to critically evaluate it. Your posts have been confusing, but you state that you've previously changed BOTH the brake master and the brake booster, so unless there was an installation error, I'm inclined to look at the corner that shows leakage.

 

[Francesko35oZ]

Never said the brake booster was OK. But if only one corner of the Z seems to have a lot of air in the brake line, it makes sense to critically evaluate it. Your posts have been confusing, but you state that you've previously changed BOTH the brake master and the brake booster, so unless there was an installation error, I'm inclined to look at the corner that shows leakage.

i never said i changed the brake booster.i'm saying can the brake booster put air in master cylinder?

 

[dkmura]

i never said i changed the brake booster.i'm saying can the brake booster put air in master cylinder?

In post #7 you confirmed the brake booster was changed- now you say it wasn't???

If the brake booster was damaged in the flood, it could be leaking internally and cause a soft pedal. This is why buying a flood damaged car can be so expensive. Multiple components can be damaged and will need to be replaced. The damage can be endless...

 

[Francesko35oZ]

In post #7 you confirmed the brake booster was changed- now you say it wasn't???

If the brake booster was damaged in the flood, it could be leaking internally and cause a soft pedal. This is why buying a flood damaged car can be so expensive. Multiple components can be damaged and will need to be replaced. The damage can be endless...

bro read the messages i own that car for 15years and we didn't buy it flooded

 

[dkmura]

Sorry bro- I never read anything about how long you'd owned the car- just tried to make some guesses based on your incomplete descriptions in your posts. It would help if you'd simply describe how extensive the flooding was for your Z.

 

[Francesko35oZ]

Sorry bro- I never read anything about how long you'd owned the car- just tried to make some guesses based on your incomplete descriptions in your posts. It would help if you'd simply describe how extensive the flooding was for your Z.

the car was totally in water.and it has been "rebuild".i will change the brake fluid again and if it does it again could it be the brake booster?

 

[dkmura]

the car was totally in water.and it has been "rebuild".i will change the brake fluid again and if it does it again could it be the brake booster?

How are you changing out the brake fluid? What are you using to pressurize the brake master or brake line?

Since you "rebuilt" this Z, did you remove the brake booster to inspect it?

 

[Francesko35oZ]

How are you changing out the brake fluid? What are you using to pressurize the brake master or brake line?

Since you "rebuilt" this Z, did you remove the brake booster to inspect it?

no i didn't inspect it

 

[Francesko35oZ]

no i didn't inspect it

How are you changing out the brake fluid? What are you using to pressurize the brake master or brake line?

Since you "rebuilt" this Z, did you remove the brake booster to inspect it?

when i bleed the brakes the pedal is ok for 2-3 days and than boom it goes to the floor again

 

[dkmura]

when i bleed the brakes the pedal is ok for 2-3 days and than boom it goes to the floor again

Once again- how are you bleeding the brakes? Manually, with a partner squeezing the brake pedal? Or are you using a pneumatic device on each corner of the car?

 

[Francesko35oZ]

Once again- how are you bleeding the brakes? Manually, with a partner squeezing the brake pedal? Or are you using a pneumatic device on each corner of the car?

manually

 

[dkmura]

If you and your partner are doing a thorough job of methodically bleeding all four corners, and having a firm brake pedal for three days, there's a slow leak somewhere in the system. The question is where and how big a leak it is. When the pedal goes soft, is the brake master still full, or has the level dropped significantly?

 

[Francesko35oZ]

Once again- how are you bleeding the brakes? Manually, with a partner squeezing the brake pedal? Or are you using a pneumatic device on each corner of the car?

like i said when i bleed them.they work fine.after 3 days it goes to the floor and it works fine if you push it 4-5 times

 

[Francesko35oZ]

If you and your partner are doing a thorough job of methodically bleeding all four corners, and having a firm brake pedal for three days, there's a slow leak somewhere in the system. The question is where and how big a leak it is. When the pedal goes soft, is the brake master still full, or has the level dropped significantly?

it's still full

 

[Francesko35oZ]

If you and your partner are doing a thorough job of methodically bleeding all four corners, and having a firm brake pedal for three days, there's a slow leak somewhere in the system. The question is where and how big a leak it is. When the pedal goes soft, is the brake master still full, or has the level dropped significantly?

maybe i have to change the fluid again

 

[dkmura]

maybe i have to change the fluid again

Maybe you should read the original question again, and post whether the brake fluid level has dropped significantly in the master? The master cylinder is clearly marked with 'min' and 'max' levels, so you should be able to read it easily. DOT 3/4 brake fluid should usually last a minimum of two years.