Brake issues... HELP please (1 Viewer)

[Haven Ridge]

So my 80 is not stopping very quickly. I mean it takes way too long to stop.
I have replaced the front pads, calipers, master cylinder, booster bled them well.
I have not touched the rear brakes though. The rig has 123000 miles on it.
We did have to get a new rear end while building it. The one in it was totally rusted.
During this process we tried to re hook up a new load sensing proportioning valve, but we couldn't. So it is not there. But I did replace the block that it goes into.
Any ideas?

 

[Haven Ridge]

Here is our rig

 

[family80]

Is the lspv deleted or was it just not attached to the axle ?

 

[77mustard40]

I’d keep going and address the rear calipers, pads and rotors (as needed). Also make sure all the soft hoses are in good condition. Have to tell you that I couldn’t get decent brake performance until I deleted the ABS and LSPV, stops much better now.

 

[McDowra]

Someone smarter than me will hopefully speak up, but I bet you need to put a proportioning valve where the LSPV was. Subbed you channel also

 

[jonheld]

Please provide the vehicle details when asking for help.
From your pictures I assume this is a 91/92 FJ80 with the 3FE engine and rear drum brakes.

When you say things like "I have not touched the rear brakes though." and then complain about the brakes, I have to scratch my head and wonder.
The rear axle has brakes too. While they are drum brakes, they are in fact brakes that help to stop the vehicle. Why would you ignore them?

Frequent use of the handbrake keeps the rear shoes in proper alignment. Make sure the handbrake bellcranks and adjusters are working properly inside the drums.
I also noticed that rotors/drums were not on your list of replacement parts. If the rotors/drums are 32 years old, they should be replaced. Do not "cut" or resurface rotors. Replace them.
Did you replace the 4 soft lines that are now 33 years old?
Did you replace all the soft vacuum lines that are now 33 years old and are brittle and cracked causing less vacuum to the brake booster? Proper vacuum is critical for proper operation.
The top half of the motor needs to be air tight. Any unmetered air will effect overall vacuum and cause a rough idle.
The array of hard vacuum lines should be checked for blockages and all should pass air easily.

 

[Haven Ridge]

Is the lspv deleted or was it just not attached to the axle ?

I forget what it is called, but the thing that is located in the center that the lbpv connects to is new, we just didn't install the arm parts that attach to it.

 

[Haven Ridge]

I’d keep going and address the rear calipers, pads and rotors (as needed). Also make sure all the soft hoses are in good condition. Have to tell you that I couldn’t get decent brake performance until I deleted the ABS and LSPV, stops much better now.

There are no rotors or calipers or pad on the rear, it is drum brakes in the rear

 

[Haven Ridge]

Someone smarter than me will hopefully speak up, but I bet you need to put a proportioning valve where the LSPV was. Subbed you channel also

Thank you very much, I appreciate it.

 

[Haven Ridge]

Please provide the vehicle details when asking for help.
From your pictures I assume this is a 91/92 FJ80 with the 3FE engine and rear drum brakes.

When you say things like "I have not touched the rear brakes though." and then complain about the brakes, I have to scratch my head and wonder.
The rear axle has brakes too. While they are drum brakes, they are in fact brakes that help to stop the vehicle. Why would you ignore them?

Frequent use of the handbrake keeps the rear shoes in proper alignment. Make sure the handbrake bellcranks and adjusters are working properly inside the drums.
I also noticed that rotors/drums were not on your list of replacement parts. If the rotors/drums are 32 years old, they should be replaced. Do not "cut" or resurface rotors. Replace them.
Did you replace the 4 soft lines that are now 33 years old?
Did you replace all the soft vacuum lines that are now 33 years old and are brittle and cracked causing less vacuum to the brake booster? Proper vacuum is critical for proper operation.
The top half of the motor needs to be air tight. Any unmetered air will effect overall vacuum and cause a rough idle.
The array of hard vacuum lines should be checked for blockages and all should pass air easily.

Sorry for my ignorance. I am totally new to the LC thing and trying to learn. I know that I shouldn't ignore the rears. I was trying to get this all fixed in 2 days to go on a camping trip today.
It sounds like I have my work cut out for me. Thank you very much for your input.

 

[Mark W]

If you have not addressed the rear brakes... then your really should not be surprised that your braking performance is not up to snuff. You know that your LSPV is not right. You don't have any idea what the condition of your rear brake shoes are. For all you know, the rear brake shoes are slathered in gear oil from leaking axle seals. Not common, but not impossible. If you KNOW that you have faulty components in the rear brake system, and you have not looked at the rest of the rear brake system then it is no surprise to me that the brakes are not working right. I'd be surprised if they were.

Are you aware that the rear brakes are not self adjusting? Are you aware that few people ever adjust those, or that few use their parking brake enough to keep them adjusted in normal use? Are you aware that with improper adjustment of the rear brakes, not only are the front doing all of the work, but the front brakes really aren't doing all they are supposed to either?

Pay attention to the rear and if the problem doe not reveal itself, *then* start looking for help online.


Mark...

 

[Haven Ridge]

If you have not addressed the rear brakes... then your really should not be surprised that your braking performance is not up to snuff. You know that your LSPV is not right. You don't have any idea what the condition of your rear brake shoes are. For all you know, the rear brake shoes are slathered in gear oil from leaking axle seals. Not common, but not impossible. If you KNOW that you have faulty components in the rear brake system, and you have not looked at the rest of the rear brake system then it is no surprise to me that the brakes are not working right. I'd be surprised if they were.

Are you aware that the rear brakes are not self adjusting? Are you aware that few people ever adjust those, or that few use their parking brake enough to keep them adjusted in normal use? Are you aware that with improper adjustment of the rear brakes, not only are the front doing all of the work, but the front brakes really aren't doing all they are supposed to either?

Pay attention to the rear and if the problem doe not reveal itself, *then* start looking for help online.


Mark...

Sorry to be a pain. I thought this would be a good place to ask questions and learn from those that know way more than me.
I understand that there is still a lot for me to look into. I am going to look into the rear brakes. Also my parking brake is not connected. I guess that I need to figure out how to do that. The main thing is we are on a very limited budget, so I am trying to do this as I can afford it.

 

[Mark W]

Sorry to be a pain. I thought this would be a good place to ask questions and learn from those that know way more than me.
I understand that there is still a lot for me to look into. I am going to look into the rear brakes. Also my parking brake is not connected. I guess that I need to figure out how to do that. The main thing is we are on a very limited budget, so I am trying to do this as I can afford it.

Nothing wrong with asking and I was not insinuating that you were wrong to do so. My point is just that you're only halfway through the very basic part of the job and at this point, it should not surprise you that the brakes are not functioning properly yet.
It's almost a certainty that your rear brakes need to be adjusted and also that that will make a very significant difference in your breaking performance.

Mark...

 

[Haven Ridge]

Nothing wrong with asking and I was not insinuating that you were wrong to do so. My point is just that you're only halfway through the very basic part of the job and at this point, it should not surprise you that the brakes are not functioning properly yet.
It's almost a certainty that your rear brakes need to be adjusted and also that that will make a very significant difference in your breaking performance.

Mark...

You are good. I guess I didn't realize that the rear brakes played such an important role. I was trying to rush to get it done, and I shouldn't have.
Thank you for putting me on the right path. That is why I am here.

 

[family80]

When you take the drums apart, put up pictures to better help how to address it.

 

[Haven Ridge]

When you take the drums apart, put up pictures to better help how to address it.

Will do, thanks

 

[Haven Ridge]

Will do, thanks

Wow... The rears are done... Pics

 

[Broski]

Also the 91-92 years have smaller front disk then the later models and looks like your putting a big load on the truck.

 

[Haven Ridge]

Also the 91-92 years have smaller front disk the the later models and looks like your putting a big load on the truck.

Yes it is heavy.

 

[family80]

I would get shoes and drums. Clean and adjust your braking will definitely improve