Need some brake advice please

[bikersmurf]

I haven't but I'm sure it would be a good idea to do so.

The front calipers went 19 years and 95k miles without any issues... I suppose they were bled every now and then when other things were changed and modified. I believe dot 3/4 is supposed to be flushed every couple years... mine was just done when I swapped frames, swapped rear axle, and converted rear axle to disc brakes etc.

 

[Diesel Cruiserman]

I did the 80 series master along with the bigger 4 runner calipers, little bending of the hard lines and away you go. One of the best upgrades I have ever done to the bj42. Only slight issue is the reservoir is on a slight angle so the fluid is hard to read on flat ground.

 

[seapotato]

I did the 80 series master along with the bigger 4 runner calipers, little bending of the hard lines and away you go. One of the best upgrades I have ever done to the bj42. Only slight issue is the reservoir is on a slight angle so the fluid is hard to read on flat ground.

I wonder if those 4runner calipers are more available than the cruiser ones.
A few years ago I bought a couple at lordco and the guy said there were only x number of new ones left.

Considering the source, I took that with a dried up seabed's worth of salt.


Lordco, where I was once asked if I was sure it was a diesel...

 

[GTSSportCoupe]

I wonder if those 4runner calipers are more available than the cruiser ones.
A few years ago I bought a couple at lordco and the guy said there were only x number of new ones left.

Considering the source, I took that with a dried up seabed's worth of salt.


Lordco, where I was once asked if I was sure it was a diesel...

1990+ 70 series came with them exclusively (light and heavy duty versions). It's what my truck came with. They're easy to get still and prolific thanks to their use in 2nd gen 4runners (89-95 V6 models).

 

[cruisedeisel]

First off.
Bench bleeding your master first. I am surprised nobody hasn't mentioned this yet.
Bleed your brakes on flat ground.
Do you have a proportioning valve above your rear axle? That must be bled as well before the rear brakes.
Start by bleeding the furthest wheel from the master and so on.
Over pumping can cause tiny bubbles which are impossible to bleed out.
I also like to bleed the the lines directly coming out of the master by just cracking the brake lines there.
The bigger MC 15/16ths is best used on vehicles with all wheel disk brakes.

 

[stevebradford]

We didn’t because we know this wasn’t nicks first rodeo

I have never heard of this 15/16 master cylinder you people keep mentioning?

As far as I knew Toyota had:
7/8 on the 40’s and most 60’s
1 1/8 on fj45’s
1 inch on later models

 

[cruisedeisel]

We didn’t because we know this wasn’t nicks first rodeo

I have never heard of this 15/16 master cylinder you people keep mentioning?

As far as I knew Toyota had:
7/8 on the 40’s and most 60’s
1 1/8 on fj45’s
1 inch on later models

He said that he might have ran the MC dry so........ You have to start all over again.

 

[GTSSportCoupe]

First off.
Bench bleeding your master first. I am surprised nobody hasn't mentioned this yet.
Bleed your brakes on flat ground.
Do you have a proportioning valve above your rear axle? That must be bled as well before the rear brakes.
Start by bleeding the furthest wheel from the master and so on.
Over pumping can cause tiny bubbles which are impossible to bleed out.
I also like to bleed the the lines directly coming out of the master by just cracking the brake lines there.
The bigger MC 15/16ths is best used on vehicles with all wheel disk brakes.

Thanks Julian.

After I realized air may have gotten into the master, I did bleed on vehicle by removing the two brake lines per the FSM procedure (cover holes with fingers). Didn't really change anything though.

Yup, was on flat ground.

Yes, did bleed the proportioning valve also many times.

Yup, started at furthest wheel.

Definitely the way we were pumping was drawing in air. I had my kid slowly releasing the brake pedal. This is what was drawing in huge bubbles from the firewall end of the master cylinder. After this, I let him snap the pedal up fast - magically, no more bubbles were seen. Bleeding again in this fashion actually has the brakes feeling pretty darn good now.

My truck has all wheel disk brakes which explains the 15/16" master I guess.