Braking problems (1 Viewer)

[georgiacruiser87]

Hey guys, got the 60 out for a little stroll for lunch today. 15 miles total. The last 2 miles acceleration became slow and I realized that the brakes were dragging even though my foot wasn’t on the pedal. The pedal also became very stiff. All 4 corners extremely hot… (fronts more than the rear) and excessive pressure in the lines… I’ve had the vehicle for 4 months and what I’ve done so far to the brake system;

New reman calipers
New pads
Checked adjustment on master cylinder with H shaped break adjustment tool.

Once the car cooled down the brake pedal was softer and I could depress it all the way. I jacked the truck up and notice some slight dragging on both fronts. I then cracked the lines open about a half a turn at the master cylinder and they spun freely.

Am I looking at a booster problem?
I planned on buying the city racer double diaphragm or just going fj80 with new master cylinder.

I just don’t need this happening again with my 10 month old in the car. We got out and walked but with brakes that hot and any sort of leak I have nightmares of it burning up.

 

[Beams37]

Yikes. Could be multiple issues.

Would look at rears not being adjusted correctly. Would look at fronts being frozen closed.

Would also look at MC. I would think that’s a bigger issue than booster.

But there’s probably people better versed than me to chime in.

 

[Pighead]

Checked adjustment on master cylinder with H shaped break adjustment tool.

What made you want to check that? Was it suspicious somehow? Did you do any adjusting then? I wonder if maybe the booster is not allowing the master cylinder piston to withdraw fully. If you can re-create the dragging in your driveway, see if loosening the master from the booster relieves it.

 

[georgiacruiser87]

What made you want to check that? Was it suspicious somehow? Did you do any adjusting then? I wonder if maybe the booster is not allowing the master cylinder piston to withdraw fully. If you can re-create the dragging in your driveway, see if loosening the master from the booster relieves it.

The day I bought it and trailered it home it locked up coming off the trailer but it quickly broke loose. I sort of just started checking stuff. It didn’t need any adjustment.

As I was checking things (when I bought it) I found that the driver side caliper was stuck and probably 30 years old. That’s why I replaced both calipers.

 

[DrRock]

Sounds like you still have some air in the system. What happens is the air expands in the lines in the engine bay etc , causing the symptoms you describe. Once the lines have cooled, the brakes free up.

 

[884runner]

I had a similar issue after replacing everything on my brakes except the master cylinder. Brakes would seize after a short drive. It seems the master cylinder can fail both ways, either no brakes at all or no release of brakes. I replaced my master cylinder and have had no problems since. I got mine from @cruisermatt

 

[cruisermatt]

OEM Brake Master Cylinder 1981-1990 FJ40 FJ60

Aisin (OEM) made brake master cylinder which works on 8/1980 and newer Land Cruiser models with disc front brakes. FJ40, 43, 45, 60, 62, as well as many 70 series models. Also works well as a replacement for NLA 75-80 FJ40 master cylinder with minor brake line mods. Cap not included, available...

cruisermatts.com